Landmine Detection Device, Landmine Detection Method, and Landmine Detection Program

Abstract

To reliably detect presence and location of a radio-wave reflecting object.SOLUTION: An underground for detection is imaged by a radio-wave transmission unit that transmits radio waves to the underground, a visible light video camera 10 that includes an image sensor 14 having light receiving sensitivity with respect to wavelengths of visible light components, and a radio wave video camera 30 that includes an image sensor 34 having light receiving sensitivity which is set according to a frequency of response waves that are the radio waves transmitted from the radio-wave transmission unit and returning after reflection by a radio-wave reflecting object. Moreover, visible light moving image data captured by the visible light video camera 10 and each piece of monochromatic radio wave moving image data obtained by converting radio wave moving image data captured by the radio wave video camera 30 into monochrome are synthesized and output. The radio wave video camera 30 is arranged at a substantially same position and angle as the visible light video camera 10. Thus, it is possible to reliably detect whether and where a radio-wave reflecting object is present.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a landmine detection device, a landmine detection method, and a landmine detection program for detecting landmines that are electromagnetic wave reflectors.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2001-7771 (Patent Document 1) describes a single-shot signal generator that generates a single-shot signal, a reception demodulation circuit that receives and demodulates the radio wave transmitted from a radio wave transmitter such as a bugging device based on the reception of the single-shot signal transmitted from the single-shot signal generator, a delay time detector that detects the delay time from when the single-shot signal generator generates the single-shot signal until the radio wave corresponding to the single-shot signal is received and demodulated and output by the reception demodulation circuit, and a timing generator that changes the timing until the next single-shot signal is generated according to the detected delay time. A radio wave transmitter detection device is described.

[0003] In this device, as the distance from a radio wave transmitter such as a bugging device increases, the period of the single-shot signal becomes longer, and as the distance to a radio wave transmitter such as a bugging device decreases, the period of the single-shot signal becomes shorter. Therefore, the location of a radio wave transmitter such as a bugging device can be surely found with a simple circuit configuration.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in addition to detecting radio wave transmitters such as bugging devices, detecting objects existing in the ground is also useful, and detecting objects existing in the ground and reflecting electromagnetic waves is useful. Specifically, for example, detecting landmines in the ground is useful.

[0006] Therefore, in one aspect, the present invention aims to provide a technology capable of reliably detecting the presence and location of an electromagnetic wave reflector.

Means for Solving the Problems

[0007] To solve the above problems, an electromagnetic wave transmitter detection device according to the present invention is an electromagnetic wave transmitter detection device for detecting an electromagnetic wave transmitter, comprising a housing, at least one first camera disposed in the housing and having a light reception sensitivity at the wavelength of the visible light component, and a second imaging element having a light reception sensitivity set in accordance with the frequency of the electromagnetic wave transmitted by the electromagnetic wave transmitter, and at least one second camera disposed in the housing so as to have a camera position and a camera angle substantially equal to those of the first camera, an image conversion unit capable of converting a second image captured by the second camera into a monochrome third image, an image synthesis unit for generating a synthesized image by synthesizing the first image captured by the first camera and the third image, and an output unit capable of outputting the synthesized image generated by the image synthesis unit.

[0008] Here, the "housing" in the present invention typically corresponds to a box-shaped container, but preferably includes a frame-shaped structure (frame body). Further, the "image" in the present invention preferably includes not only still images but also moving images.

[0009] According to the present invention, since the second imaging element has a light reception sensitivity (in other words, an electromagnetic wave reception sensitivity) at the wavelength of the electromagnetic wave transmitted by the electromagnetic wave transmitter, the electromagnetic wave transmitted from the electromagnetic wave transmitter can be imaged by the second camera. Then, while converting the second image obtained by imaging the electromagnetic wave transmitted from the electromagnetic wave transmitter into a monochrome third image, and outputting a synthesized image obtained by synthesizing the first image captured by the first camera disposed at a camera position and a camera angle substantially equal to those of the second camera and the third image, it is possible to reliably detect not only whether an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timing exists in the detection target space, but also at which position in the detection target space the electromagnetic wave transmitter exists.

[0010] The electromagnetic wave transmitter detection device according to the present invention is an electromagnetic wave transmitter detection device for detecting an electromagnetic wave transmitter, and includes a visible light transmission material capable of transmitting the wavelength of the visible light component and an electromagnetic wave transmission material capable of transmitting a wavelength set according to the frequency of the electromagnetic wave transmitted by the electromagnetic wave transmitter, which are patterned and arranged, a filter, an imaging element having a light reception sensitivity to the wavelength transmitted through the filter, at least one camera including the same, an image conversion unit capable of converting the image captured by the camera into a monochrome conversion image in monochrome, an image synthesis unit for generating a synthesized image by synthesizing the image captured by the camera and the monochrome conversion image, and an output unit capable of outputting the synthesized image generated by the image synthesis unit. It may be configured in this way.

[0011] According to the present invention, since the camera has a visible light transmission material capable of transmitting the wavelength of the visible light component and an electromagnetic wave transmission material capable of transmitting the wavelength of the electromagnetic wave transmitted by the electromagnetic wave transmitter, which are patterned and arranged, and an imaging element having a light reception sensitivity to the wavelength transmitted through the filter, it is possible to image the electromagnetic wave transmitted from the electromagnetic wave transmitter in the image of the space of the detection target captured by the camera. As a result, it is possible to surely detect not only whether or not an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timing exists in the space of the detection target, but also at which position in the space of the detection target the electromagnetic wave transmitter exists.

[0012] Moreover, the electromagnetic wave transmitter detection method according to the present invention is an electromagnetic wave transmitter detection method for detecting an electromagnetic wave transmitter, comprising: (a) at least one first camera including a first image sensor having a light reception sensitivity at the wavelength of the visible light component, and at least one second camera including a second image sensor having a light reception sensitivity set according to the frequency of the electromagnetic wave transmitted by the electromagnetic wave transmitter, and arranging them so as to have substantially equal camera positions and camera angles; (b) imaging a space to be detected by the first and second cameras; (c) converting a second image captured by the second camera into a monochrome third image; (d) generating a composite image by synthesizing a first image captured by the first camera and the third image; and (e) outputting the generated composite image.

[0013] Here, the "image" in the present invention preferably includes not only still images but also moving images.

[0014] According to the present invention, since the second image sensor has a light reception sensitivity (in other words, an electromagnetic wave reception sensitivity) at the wavelength of the electromagnetic wave transmitted by the electromagnetic wave transmitter, the electromagnetic wave transmitted from the electromagnetic wave transmitter can be imaged by the second camera. Then, while converting the second image obtained by imaging the electromagnetic wave transmitted from the electromagnetic wave transmitter into a monochrome third image, a composite image is output by synthesizing the first image captured by the first camera arranged at substantially the same camera position and camera angle as the second camera and the third image. Therefore, even for an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timings, it is possible to surely detect not only whether the electromagnetic wave transmitter exists in the space to be detected but also at which position in the space to be detected the electromagnetic wave transmitter exists.

[0015] Further, the electromagnetic wave transmitter detection program according to the present invention may be configured to cause a computer to execute at least steps (b) to (e) of the electromagnetic wave transmitter detection method according to the present invention described above.

[0016] According to the present invention, the present invention has the same effects as those of the electromagnetic wave transmitter detection method according to the present invention described above. For example, even for an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timing, not only can it be detected whether it exists in the space to be detected, but also the position in the space to be detected where the electromagnetic wave transmitter exists can be surely detected.

[0017] The electromagnetic wave transmitter detection method according to the present invention is an electromagnetic wave transmitter detection method for detecting an electromagnetic wave transmitter, and includes: (f) a filter in which a visible light transmitting material capable of transmitting the wavelength of the visible light component and an electromagnetic wave transmitting material capable of transmitting a wavelength set according to the frequency of the electromagnetic wave transmitted by the electromagnetic wave transmitter are patterned and arranged; and an imaging element having a light receiving sensitivity to the wavelength transmitted through the filter. An imaging step of imaging the space to be detected by at least one camera including the imaging element; (g) a step of converting the image captured by the camera into a monochrome converted image in monochrome; (h) a step of generating a composite image by combining the image captured by the camera and the monochrome converted image; and (i) a step of outputting the generated composite image. It may be configured as such.

[0018] Here, the "image" in the present invention preferably includes not only still images but also moving images.

[0019] According to the present invention, a filter in which a visible light transmitting material capable of transmitting the wavelength of the visible light component and an electromagnetic wave transmitting material capable of transmitting the wavelength of the electromagnetic wave transmitted by the electromagnetic wave transmitter are patterned and arranged, and an imaging element having a light receiving sensitivity to the wavelength transmitted through the filter are used. By imaging the space to be detected with a camera having the imaging element, the electromagnetic wave transmitted from the electromagnetic wave transmitter can be imaged in the image of the space to be detected. Thereby, even for an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timing, not only can it be detected whether it exists in the space to be detected, but also the position in the space to be detected where the electromagnetic wave transmitter exists can be surely detected.

[0020] The electromagnetic wave transmitter detection program according to the present invention may be configured to cause a computer to execute the electromagnetic wave transmitter detection method according to the present invention described above (specifically, at least steps (f) to (i)).

[0021] According to the present invention, effects similar to those of the electromagnetic wave transmitter detection method according to the present invention described above can be achieved. For example, even for an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timings, not only can it be detected whether it exists in the space to be detected, but also the position in the space to be detected where the electromagnetic wave transmitter exists can be surely detected.

Advantages of the Invention

[0022] According to the present invention, on one aspect, it becomes possible to surely detect the presence and location of an electromagnetic wave transmitter.

Brief Description of the Drawings

[0023]

Figure 1

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Mode for Carrying Out the Invention

[0024] Hereinafter, examples (embodiments) of the present invention will be described with reference to the accompanying drawings.

Example

[0025] As shown in FIG. 1, the electromagnetic wave transmitter detection device 1 according to Example 1 is configured as a device capable of detecting an electromagnetic wave transmitter installed in a space to be detected, such as a room, specifically, a device capable of detecting a bug.

[0026] The electromagnetic wave transmitter detection device 1 according to Example 1 includes an imaging device 2 that images the space to be detected and a personal computer (hereinafter referred to as "PC") 50 that is wired to the imaging device 2. In this embodiment, the imaging device 2 and the PC 50 are configured to be wired, but it goes without saying that the imaging device 2 and the PC 50 may be configured to be wirelessly connected.

[0027] The bug is an example of an implementation configuration corresponding to the "electromagnetic wave transmitter" in the present invention. However, the "electromagnetic wave transmitter" in the present invention is not limited to a bug, and various devices that transmit various information by electromagnetic waves widely correspond to it.

[0028] As shown in FIG. 1, the imaging device 2 includes a housing 4, a visible light video camera 10 and an electromagnetic wave video camera 30 disposed on each surface of the housing 4.

[0029] The housing 4 is configured as a polyhedron having six surfaces. Four support legs 6, 6, 6, 6 are detachably attached to the bottom surface of the housing 4.

[0030] In this embodiment, the imaging device 2 is configured to be mounted with the support legs 6, 6, 6, 6 on the housing 4 and perform imaging in the installed state. Needless to say, the imaging device 2 may be configured to perform imaging while being held by hand.

[0031] As shown in FIG. 2, the visible light video camera 10 is configured as a general digital video camera, and includes a lens 12, an image sensor 14 having a color filter 13, an image processing engine 16 electrically connected to the image sensor 14, video output terminals 18, a recording medium 20, an audio receiving unit 22, a liquid crystal monitor 24, a viewfinder 26, and a camera body 28 that houses these components.

[0032] In this embodiment, the image sensor 14 is configured to use a CMOS (Complementary Metal Oxide Semiconductor) made of a semiconductor light receiving element, and has a light receiving sensitivity in the wavelength range of visible light components, for example, 360 nm to 830 nm (converted to frequency, 361 THz to 833 THz). Note that the semiconductor light receiving element included in the image sensor 14 may be a CCD (Charge Coupled Device).

[0033] The image processing engine 16 is a part that converts the video data generated by the image sensor 14 into a file that can be visually recognized as a video. Also, the image processing engine 16 associates the image or video converted into a visually recognizable file with the audio signal received by the audio reception unit 22, and outputs it to the PC 50 via the video output terminal 18 and also outputs it to the recording medium 20. Furthermore, the image processing engine 16 outputs the image or video converted into a visually recognizable file to the liquid crystal monitor 24 and the viewfinder 26. Note that the video output terminal 18 and the PC 50 are connected by a cable 82 via an adapter 80 (see FIG. 1).

[0034] The visible light video camera 10 corresponds to the "first camera" in the present invention, and the image sensor 14 is an example of an implementation configuration corresponding to the "first imaging device" in the present invention.

[0035] Note that the information associated with the image or video converted into a visually recognizable file in the image processing engine 16 is not limited to audio (specifically, an audio signal), and may be, for example, temperature information measured by a temperature sensor, and furthermore, may be various information that can be sensed by various sensors and the like.

[0036] As shown in FIG. 3, the electromagnetic wave video camera 30 includes a lens 32, an image sensor 34, an image processing engine 36 electrically connected to the image sensor 34, a video output terminal 38 and a recording medium 40 electrically connected to the image processing engine 36, a camera body 44 that houses these, and a band-pass filter 46 attached to the front of the lens 32. Note that the band-pass filter 46 may be attached to the rear of the lens 32.

[0037] In the present embodiment, the image sensor 34 is configured to use a CMOS composed of a semiconductor light receiving element. Note that the semiconductor light receiving element included in the image sensor 34 may be a CCD.

[0038] In this embodiment, the image sensor 34 has a light reception sensitivity (in other words, an electromagnetic wave reception sensitivity) in the frequency range of electromagnetic waves transmitted by the eavesdropping device, for example, 145 MHz to 430 MHz. As a result, since the electromagnetic waves transmitted by the eavesdropping device can be received and imaged, the location of the eavesdropping device can be detected. The image sensor 34 may have a light reception sensitivity (in other words, an electromagnetic wave reception sensitivity) in the frequency range of 800 MHz to 2 GHz as the frequency of the electromagnetic waves transmitted by the eavesdropping device.

[0039] The image processing engine 36 is a part that converts the moving image data generated by the image sensor 34 into a file that can be visually recognized as a video. In addition, the image processing engine 36 outputs the image or video converted into a visually recognizable file to the PC 50 via the video output terminal 38 and also outputs it to the recording medium 20. Note that the video output terminal 38 and the PC 50 are connected by a cable 82 via an adapter 80 (see FIG. 1).

[0040] The band-pass filter 46 has a characteristic that it can transmit wavelengths of 700 nm or more (when converted to frequency, 428 THz or less). That is, the band-pass filter 46 is configured as a filter that hardly transmits visible light and generally transmits wavelengths of far-infrared rays or more. The wavelength transmitted by the band-pass filter 46 is not limited to 700 nm or more (when converted to frequency, 428 THz or less), but is set in a range that can transmit wavelengths of far-infrared rays or more without transmitting (or hardly transmitting) visible light.

[0041] The electromagnetic wave video camera 30 corresponds to the "second camera" in the present invention, and the image sensor 34 is an example of an implementation configuration corresponding to the "second imaging element" in the present invention.

[0042] Here, the range of the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave that the electromagnetic wave video camera 30 (specifically, the image sensor 34) targets for light reception / reception is not limited to the ranges of 145 MHz to 430 MHz or 800 MHz to 2 GHz, and may be at least a part of the range of 1 Hz to 1 PHz. The range of the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave that the electromagnetic wave video camera 30 (specifically, the image sensor 34) targets for light reception / reception may be appropriately set to include, for example, the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave transmitted (or assumed to be transmitted) by the electromagnetic wave transmitter as a device of the object to be detected. Note that the electromagnetic wave frequency bands, infrared electromagnetic wave frequency bands, ultraviolet electromagnetic wave frequency bands, 2.4 GHz, 100 MHz, 200 MHz, 300 MHz, 400 MHz, 700 MHz, 800 MHz, and 1200 MHz, which are restricted for general use, may be excluded.

[0043] The PC 50 is configured as a microprocessor centered on a CPU (not shown), and includes a ROM (not shown) that stores various processing programs, a RAM (not shown) that temporarily stores data, a GPU (not shown) that performs the necessary calculation processing and matrix operation processing when performing image processing, a large-capacity memory (not shown) such as a hard disk drive (HDD) that stores various application programs (simply referred to as applications) including the electromagnetic wave transmitter detection program according to the present invention, as well as various data including image data and video data, and an input / output interface (I / F) (not shown) that performs input / output of data with external devices. The PC 50 is provided with an input device (not shown) such as a keyboard and a mouse through which the user inputs various commands, and a display 52 that displays various information. The CPU, ROM, RAM, GPU, HDD, I / F, input device, and display 52 are electrically connected by a bus (not shown) and are configured to be able to exchange various control signals and data with each other.

[0044] In the PC50, through the cooperation of one or both of the aforementioned hardware resources such as the CPU, ROM, RAM, GPU, HDD, I / F, input device, and display 52, and software such as various applications and programs, as shown in FIG. 4, a visible light video acquisition unit 61, an electromagnetic wave video acquisition unit 62, a video conversion unit 63, a video synthesis unit 64, a location identification unit 65, a storage unit 66, an output unit 67, a display unit 68, etc. are configured as functional blocks. In other words, each of these units (visible light video acquisition unit 61, electromagnetic wave video acquisition unit 62, video conversion unit 63, video synthesis unit 64, location identification unit 65, storage unit 66, output unit 67, display unit 68) is a function realized by the components (CPU, ROM, RAM, GPU, HDD, I / F, input device, display 52, etc.) operating alone or in cooperation according to instructions from the CPU that executes the application deployed from the HDD onto the RAM. Note that the visible light video acquisition unit 61, electromagnetic wave video acquisition unit 62, video conversion unit 63, video synthesis unit 64, location identification unit 65, storage unit 66, output unit 67, display unit 68, etc. are electrically connected by bus lines (not shown) such as address buses and data buses.

[0045] The visible light video acquisition unit 61 acquires visible light video data captured by each visible light video camera 10 (see FIG. 1) arranged on each surface of the housing 4, and supplies the acquired visible light video data to the video synthesis unit 64, the storage unit 66, etc. in a manner that enables identification of which visible light video camera 10 among the six visible light video cameras 10 captured the data. The visible light video data is an example of an implementation configuration corresponding to the "first image" in the present invention.

[0046] The visible light video (first image) is, that is, an image targeted at visible light, and may be a color image or a grayscale image.

[0047] The electromagnetic wave video acquisition unit 62 acquires electromagnetic wave video data captured by each electromagnetic wave video camera 30 (see FIG. 1) arranged on each surface of the housing 4, and supplies the acquired electromagnetic wave video data to the video conversion unit 63, the video composition unit 64, the storage unit 66, etc. in a manner that enables identification of which electromagnetic wave video camera 30 among the six electromagnetic wave video cameras 30 captured the data. The electromagnetic wave video data is an example of an implementation configuration corresponding to the "second image" in the present invention.

[0048] The electromagnetic wave video (second image) is, that is, an image targeted at the wavelength of the electromagnetic wave transmitted by an electromagnetic wave transmitter (e.g., a bugging device). In other words, it is an image representing the situation of the detection of the electromagnetic wave transmitted by the electromagnetic wave transmitter, and it may be a color image or a grayscale image.

[0049] The video conversion unit 63 acquires electromagnetic wave video data from the electromagnetic wave video acquisition unit 62, converts the electromagnetic wave video data into monochrome electromagnetic wave video data in monochrome tone, and supplies the converted monochrome electromagnetic wave video data to the video composition unit 64, the location identification unit 65, and the storage unit 66. The video conversion unit 63 is an example of an implementation configuration corresponding to the "image conversion unit" in the present invention. The monochrome electromagnetic wave video data is an example of an implementation configuration corresponding to the "third image" in the present invention.

[0050] The monochrome electromagnetic wave video (third image) is, that is, an image obtained by converting the electromagnetic wave video (second image) into monochrome tone.

[0051] The monochrome electromagnetic wave video data (third image) is, for example, a video (image) of transparency and white, and is a video (image) converted so that the color increases according to the intensity of the detected electromagnetic wave (that is, the portion where the intensity of the detected electromagnetic wave is zero is transparent). Note that the monochrome electromagnetic wave video data (third image) is not limited to a video (image) of transparency and white as long as it is a video (image) of transparency and a single color (in other words, a predetermined single color), and may be, for example, a video (image) of transparency and black, a video (image) of transparency and red, a video (image) of transparency and blue, or a video (image) of transparency and green.

[0052] The video synthesizing unit 64 synthesizes the visible light video data from the visible light video acquisition unit 61 and the monochrome electromagnetic wave video data from the video conversion unit 63, and supplies each synthesized video data to the storage unit 66 or the output unit 67 in a manner that enables identification of which of the six visible light video cameras 10 and the six electromagnetic wave video cameras 30 captured the data. The video synthesizing unit 64 is an example of an implementation configuration corresponding to the "image synthesizing unit" in the present invention.

[0053] The monochrome electromagnetic wave video data (the third image) is a video (image) of transparency and a single color (a predetermined single color), and is a video (image) converted so that the color increases according to the intensity of the detected electromagnetic wave. As a process of synthesizing the visible light video data (the first image) and the monochrome electromagnetic wave video data (the third image), the video synthesizing unit 64 generates a synthesized image by, for example, superimposing (in other words, covering) the monochrome electromagnetic wave video (the third image; specifically, each frame of the monochrome electromagnetic wave video data) on the visible light video (the first image; specifically, each frame of the visible light video data) (see FIGS. 9 and 10). In FIG. 9, the transparent part in the monochrome electromagnetic wave video (the third image) is displayed in black so that the part where the eavesdropping device (specifically, the electromagnetic wave transmitted from the eavesdropping device as an electromagnetic wave transmitter) is imaged is easy to understand.

[0054] The synthesized image is an image obtained by synthesizing the visible light video (the first image) and the monochrome electromagnetic wave video (the third image). For example, in the color image (the first image), the part where the intensity of the detected electromagnetic wave is zero (or below a predetermined threshold) is transparent, and a monochrome image (the third image) converted so that the color increases according to the intensity of the detected electromagnetic wave is superimposed.

[0055] The specific location determination unit 65 uses the monochromatic electromagnetic wave video data from the video conversion unit 63 to determine whether a frame in which a eavesdropping device (specifically, an electromagnetic wave emitted from an eavesdropping device as an electromagnetic wave transmitter) is imaged is included in the monochromatic electromagnetic wave video data. If there is a frame in which the eavesdropping device is imaged, the location (i.e., place, position) of the eavesdropping device in the frame is specified.

[0056] Specifically, the specific location determination unit 65 determines whether there is a portion that emits white light in each frame of the monochromatic electromagnetic wave video data by image processing. If there is a portion that emits white light, the portion that emits white light is specified as the location of the eavesdropping device. Then, the specific location determination unit 65 supplies the location of the eavesdropping device specified in the frame of the monochromatic electromagnetic wave video data to the display unit 68 as the position information in the frame. The specific location determination unit 65 is an example of an implementation configuration corresponding to the "frame specification unit" and the "location specification unit" in the present invention.

[0057] When determining whether there is a portion that emits white light (i.e., a portion in which an electromagnetic wave emitted from an eavesdropping device as an electromagnetic wave transmitter is imaged) in each frame of the monochromatic electromagnetic wave video data, in other words, when determining whether there is a pixel corresponding to the portion that emits white light in each frame of the monochromatic electromagnetic wave video data, a threshold value of the monochromatic intensity for each pixel may be set, or a threshold value related to the degree of aggregation of pixels may be set.

[0058] In the present invention, the "monochromatic intensity" is defined as the intensity of any one of white, black, green, red, and blue as a certain monochromatic color (in other words, a predetermined monochromatic color) in the monochromatic electromagnetic wave video data. The monochromatic intensity is such that 0 is transparent (i.e., the background color of the visible light video (the first image), that is, the visible light video remains as it is), and the maximum value is the maximum monochromatic density.

[0059] Then, in relation to the monochromatic intensity of the white-light portions in each frame of the monochromatic electromagnetic wave video data, in the monochromatic image (the third image), the stronger the intensity of the electromagnetic wave (the white-light portion) transmitted from and sensed by the electromagnetic wave transmitter (e.g., a bugging device), the darker the monochromatic density of the white-light portion becomes (i.e., the stronger the monochromatic intensity). Here, while the intensity range of the electromagnetic wave is from 0 to infinity, the monochromatic density range is finite as it is from transparent (i.e., the background color of the visible light video (the first image)) to the maximum monochromatic density. For this reason, a minimum value and a maximum value of the light reception sensitivity (in other words, the reception sensitivity of the electromagnetic wave) are provided, and the minimum value and the maximum value may be adjusted and set respectively so that the white-light portions in the composite image are displayed well (in other words, are easy to view).

[0060] In this case, the transparent portion (i.e., monochromatic intensity = 0) in the monochromatic image (the third image) corresponds to the minimum value of the reception sensitivity of the intensity of the electromagnetic wave transmitted from the electromagnetic wave transmitter (bugging device), and all electromagnetic wave intensities below the minimum value become transparent (i.e., monochromatic intensity = 0). Also, the monochromatic intensity = maximum monochromatic density in the monochromatic image (the third image) corresponds to the maximum value of the reception sensitivity of the intensity of the electromagnetic wave transmitted from the electromagnetic wave transmitter (bugging device), and all electromagnetic wave intensities above the maximum value become monochromatic intensity = maximum monochromatic density. And the minimum value and the maximum value of the reception sensitivity of the intensity of the electromagnetic wave transmitted from the electromagnetic wave transmitter (bugging device) may be set appropriately respectively.

[0061] Note that a certain monochromatic color in the monochromatic electromagnetic wave video data may be selectively set to any one of white, black, green, red, and blue. The maximum monochromatic density becomes pure white, pure black, pure green, pure red, and pure blue respectively. Also, for example, when the visible light video (the first image) is a bright and white-like image, in order to make the monochromatic color (i.e., the white-light portion) easier to understand, the monochromatic color may be changeable from white to black or the like.

[0062] The memory unit 66 stores visible light video data, electromagnetic wave video data, monochrome electromagnetic wave video data, and composite video data in a manner that enables identification of which of the six visible light video cameras 10 and the six electromagnetic wave video cameras 30 captured the data.

[0063] The output unit 67 outputs the composite video data generated by the video synthesis unit 64 to the display unit 68 in a manner that enables identification of which of the six visible light video cameras 10 and the six electromagnetic wave video cameras 30 captured the data.

[0064] The display unit 68 displays the composite video data from the output unit 67 on the display 52 in a manner that enables identification of which of the six visible light video cameras 10 and the six electromagnetic wave video cameras 30 captured the data. Further, when the composite video data has a frame including a eavesdropping device, the display unit 68 displays the location of the eavesdropping device identified by the location identification unit 65 in a visually confirmable manner. In this embodiment, the location of the eavesdropping device is displayed surrounded by a frame (see FIG. 10). Note that the location of the eavesdropping device may be indicated and displayed by a mark such as an arrow.

[0065] Next, the operation of the electromagnetic wave transmitter detection device 1 configured in this way, particularly the operation when detecting an eavesdropping device, will be described. When detecting an eavesdropping device, first, the electromagnetic wave transmitter detection device 1 is installed in a space to be detected, such as a room suspected of having an eavesdropping device installed.

[0066] When the installation of the electromagnetic wave transmitter detection device 1 in the space to be detected is completed, the imaging device 2 is activated and the PC 50 is operated to execute the electromagnetic wave transmitter detection program according to the present invention. As a result, the electromagnetic wave transmitter detection program according to the present invention stored in the memory including the ROM is read by the CPU, and information is processed according to the steps instructed by the program, and the electromagnetic wave transmitter detection method according to the present invention is executed.

[0067] When the electromagnetic wave transmitter detection program is executed, first, the visible light video acquisition unit 61 and the electromagnetic wave video acquisition unit 62 execute a process of acquiring visible light video data and electromagnetic wave video data from the six visible light video cameras 10 and the six electromagnetic wave video cameras 30, respectively. Subsequently, the video conversion unit 63 acquires each electromagnetic wave video data acquired by the electromagnetic wave video acquisition unit 62 and executes a process of converting each electromagnetic wave video data into monochrome electromagnetic wave video data in monochrome.

[0068] When the monochrome electromagnetic wave video data is generated, the video synthesis unit 64 synthesizes each visible light video data acquired by the visible light video acquisition unit 61 and the corresponding monochrome electromagnetic wave video data to generate synthesized video data. Then, the output unit 67 executes a process of outputting each synthesized video data generated to the display unit 68.

[0069] On the other hand, the location identification unit 65 uses each generated monochrome electromagnetic wave video data to execute a process of determining whether a frame in which a eavesdropping device (specifically, an electromagnetic wave transmitted from an eavesdropping device as an electromagnetic wave transmitter) is imaged is included in the monochrome electromagnetic wave video data.

[0070] Here, the determination of whether the frame in which the eavesdropping device is imaged is included can be performed by the location identification unit 65 performing image processing on each monochromatic electromagnetic wave video data to determine whether there is a portion that emits white light in each frame of the respective monochromatic electromagnetic wave video data. In this case, a threshold value of the monochromatic intensity for each pixel may be set to determine whether there is a pixel corresponding to the portion that emits white light in each frame of the monochromatic electromagnetic wave video data, or a threshold value related to the degree of aggregation of pixels may be set.

[0071] When it is determined that there is a frame in which the eavesdropping device is imaged in any of the monochromatic electromagnetic wave video data, the location (i.e., the place, position) of the eavesdropping device in the frame is identified. Specifically, in the frame, the portion that emits white light is identified as the location of the eavesdropping device. Then, the location identification unit 65 supplies the location of the eavesdropping device identified in the frame of the monochromatic electromagnetic wave video data to the display unit 68 as the position information in the frame.

[0072] Finally, the display unit 68 executes a process of displaying each synthesized video data on the display 52. At this time, when any of the monochromatic electromagnetic wave video data constituting each synthesized video data includes a frame in which the eavesdropping device is imaged, the location of the eavesdropping device is displayed surrounded by a frame on the corresponding synthesized video data.

[0073] FIG. 5 and FIG. 8 are explanatory diagrams each showing an example of one frame of first and second visible light moving image data captured by any two of the six visible light video cameras 10 (hereinafter, for convenience, may be referred to as the "first visible light video camera" and the "second visible light video camera"). FIGS. 6 and 9 are explanatory diagrams each showing an example of one frame of first and second monochrome electromagnetic wave moving image data obtained by converting the first and second electromagnetic wave moving image data captured by two electromagnetic wave video cameras 30 that are paired with the above-mentioned any two first and second visible light video cameras among the six electromagnetic wave video cameras 30 (hereinafter, for convenience, may be referred to as the "first electromagnetic wave video camera" and the "second electromagnetic wave video camera") into monochrome. FIGS. 7 and 10 are explanatory diagrams each showing an example of one frame of first and second composite moving image data obtained by synthesizing the first and second visible light moving image data and the first and second monochrome electromagnetic wave moving image data, respectively.

[0074] Note that the monochrome electromagnetic wave moving image data (the third image) is a moving image (image) of transparency and a certain single color, and is a moving image (image) converted so that the color increases according to the intensity of the detected electromagnetic wave. In FIGS. 6 and 9, in order to make it easy to see the portion where the eavesdropping device (specifically, the electromagnetic wave transmitted from the eavesdropping device as an electromagnetic wave transmitter) is imaged, the transparent portion in the moving image (image) is displayed in black.

[0075] When imaging a space where no eavesdropping device is installed, as shown in FIGS. 6 and 7, in the first monochrome electromagnetic wave moving image data and the first composite moving image data, the portion that emits white light is not imaged. On the other hand, when imaging a space where an eavesdropping device is installed, as shown in FIGS. 9 and 10, in the second monochrome electromagnetic wave moving image data and the second composite moving image data, the portion that emits white light is imaged, and on the display 52, the portion that emits white light on the second composite moving image is surrounded by a frame and displayed.

[0076] According to the electromagnetic wave transmitter detection device 1 according to the first embodiment described above, six visible light video cameras 10 including an image sensor 14 having a light reception sensitivity at the wavelength of the visible light component, and six visible light video cameras 10 are arranged at substantially the same position and angle, and six electromagnetic wave video cameras 30 having an image sensor 34 having a light reception sensitivity at the wavelength of the electromagnetic wave transmitted by the eavesdropping device image the space to be detected, and each visible light video data imaged by the visible light video camera 10 and each monochrome electromagnetic wave video data obtained by converting each electromagnetic wave video data imaged by the electromagnetic wave video camera 30 into monochrome are combined and output, so it is possible to surely detect whether or not an eavesdropping device is installed and its location. In addition, in order to image the space to be detected in video, even an eavesdropping device that transmits electromagnetic waves at random timing can surely detect whether or not an eavesdropping device is installed and its location. Further, since six visible light video cameras 10 and six electromagnetic wave video cameras 30 are used, it is possible to simultaneously detect all directions of the space to be detected, so the eavesdropping device can be detected in a short time. Furthermore, when the eavesdropping device is installed, a frame is displayed at the location of the eavesdropping device on the composite video displayed on the display 52, so the location of the eavesdropping device can be easily known.

[0077] In the electromagnetic wave transmitter detection device 1 of the first embodiment, the imaging device 2 is configured to include a visible light video camera 10 and an electromagnetic wave video camera 30, but it is not limited thereto. For example, the imaging device 2 may be configured to include a visible light digital camera instead of the visible light video camera 10, or an electromagnetic wave digital camera instead of the electromagnetic wave video camera 30. In the case where the imaging device 2 includes a visible light digital camera and the electromagnetic wave video camera 30, the video composition unit 64 may be configured to select one frame (hereinafter referred to as "monochrome image data") from the monochrome video data converted by the video conversion unit 63, and compose the visible light image data captured by the visible light digital camera and the monochrome image data. In the case where there is a frame in the monochrome video data in which the eavesdropping device is imaged, the video composition unit 64 selects the monochrome image data in which the eavesdropping device is imaged and composes it with the visible light image data.

[0078] In the electromagnetic wave transmitter detection device 1 of the first embodiment, the imaging device 2 is configured to include six visible light video cameras 10 and six electromagnetic wave video cameras 30, but it is not limited thereto. For example, the imaging device 2 may be configured to include only a set of visible light video camera 10 and electromagnetic wave video camera 30, or may be configured to include two to five, or seven or more visible light video cameras 10 and electromagnetic wave video cameras 30.

[0079] In the electromagnetic wave transmitter detection device 1 of the first embodiment, the electromagnetic wave transmitter detection device 1 includes a video conversion unit 63, and the video conversion unit 63 is configured to convert the electromagnetic wave video data into monochrome electromagnetic wave video data in monochrome, but it is not limited thereto. For example, the image processing engine 36 of the electromagnetic wave video camera 30 may be configured to convert the electromagnetic wave video data into monochrome electromagnetic wave video data in monochrome.

Embodiment

[0080] Next, the electromagnetic wave transmitter detection device 100 according to Embodiment 2 will be described. As shown in FIG. 11, the electromagnetic wave transmitter detection device 100 according to Embodiment 2 is an electromagnetic wave transmitter installed in a space to be detected, such as a room, specifically, a device configured to be able to detect a bug.

[0081] The electromagnetic wave transmitter detection device 100 according to Embodiment 2 includes an imaging device 102 that images the space to be detected, and a PC 150 that is wired-connected to the imaging device 102. In this embodiment, the imaging device 102 and the PC 150 are configured to be wired-connected, but it goes without saying that the imaging device 102 and the PC 150 may be configured to be wirelessly connected.

[0082] The electromagnetic wave transmitter detection device 100 according to this Embodiment 2 replaces the visible light video camera 10 and the electromagnetic wave video camera 30 with the video camera 110 with respect to the electromagnetic wave transmitter detection device 1 according to Embodiment 1. Along with this, the visible light video acquisition unit 61 and the electromagnetic wave video acquisition unit 62 are replaced with the video acquisition unit 161, and the video conversion unit 63 and the video synthesis unit 64 are deleted (note that, as will be described later, a configuration including the video conversion unit 63 and the video synthesis unit 64 may also be used). To avoid redundant explanations, the components of the electromagnetic wave transmitter detection device 100 according to Embodiment 2 that correspond to the components of the electromagnetic wave transmitter detection device 1 according to Embodiment 1 are denoted by the same reference numerals, and their detailed explanations are omitted.

[0083] As shown in FIG. 12, the video camera 110 of Embodiment 2 includes a lens 112, an image sensor 114 having a filter 113, an image processing engine 116 electrically connected to the image sensor 114, video output terminals 118, a recording medium 120, and an audio receiving unit 122 that are electrically connected to the image processing engine 116, and a camera body 124 that houses these components.

[0084] The filter 113 has a configuration in which a visible light transmitting material (e.g., red, green, and blue color resists) capable of transmitting wavelengths in the range of the wavelengths of visible light components, for example, 360 nm to 830 nm (when converted to frequency, 361 THz to 833 THz), and an electromagnetic wave transmitting material capable of transmitting wavelengths in the range of the frequencies of electromagnetic waves transmitted by the eavesdropping device, for example, 145 MHz to 430 MHz, are patterned and arranged. The filter 113 may have a configuration in which an electromagnetic wave transmitting material capable of transmitting wavelengths in the range of 800 MHz to 2 GHz as the frequency of the electromagnetic waves transmitted by the eavesdropping device is patterned and arranged.

[0085] In this embodiment, the image sensor 114 is configured to use a CMOS composed of semiconductor light receiving elements. Note that the semiconductor light receiving elements included in the image sensor 114 may be CCDs.

[0086] The image sensor 114 has a light reception sensitivity (in other words, an electromagnetic wave reception sensitivity) in the range of the wavelengths of visible light components, for example, 360 nm to 830 nm (when converted to frequency, 361 THz to 833 THz), and in the range of the frequencies of electromagnetic waves transmitted by the eavesdropping device, for example, 145 MHz to 430 MHz, respectively. Thereby, an image (moving image) of the space to be detected can be captured, and the electromagnetic waves transmitted by the eavesdropping device can be received and captured. As a result, the location of the eavesdropping device can be detected. The image sensor 114 may have a light reception sensitivity (in other words, an electromagnetic wave reception sensitivity) in the range of 800 MHz to 2 GHz as the frequency of the electromagnetic waves transmitted by the eavesdropping device.

[0087] The image processing engine 116 is a part that converts the moving image data generated by the image sensor 114 into a file that can be visually recognized as a video. Further, the image processing engine 116 outputs the image or video converted into a visually recognizable file to the PC 150 via the video output terminal 118 and also outputs it to the recording medium 120. Note that the video output terminal 118 and the PC 150 are connected by a cable 82 via an adapter 80 (see FIG. 11).

[0088] The video camera 110 corresponds to the "camera" in the present invention, and the image sensor 114 is an example of an implementation configuration corresponding to the "imaging device" in the present invention.

[0089] Note that the video camera 110 of the second embodiment may also have the audio receiving unit 22, similar to the visible light video camera 10 of the first embodiment. Then, the images and videos converted into viewable files in the image processing engine 116 may be associated with the audio signals received by the audio receiving unit 22 and output to the PC 150 via the video output terminal 118 and also output to the recording medium 120. In this case, the information associated with the images and videos converted into viewable files in the image processing engine 116 is not limited to audio (specifically, audio signals), and may be, for example, temperature information measured by a temperature sensor, and further, various information that can be sensed by various sensors and the like.

[0090] Here, the range of the frequency / frequency band of the electromagnetic wave corresponding to the wavelength / wavelength band of the electromagnetic wave transmitted by the eavesdropping device that the electromagnetic wave transmission material of the filter 113 of the video camera 110 transmits and the image sensor 114 receives / responds to is not limited to the range of 145 MHz to 430 MHz or 800 MHz to 2 GHz, and may be at least a part of the range of 1 Hz to 1 PHz. The range of the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave that the electromagnetic wave transmission material of the filter 113 of the video camera 110 transmits and the image sensor 114 receives / responds to may be appropriately set to include, for example, the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave transmitted (or assumed to be transmitted) by the electromagnetic wave transmitter as the device to be detected. Note that the range of the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave that the image sensor 114 receives / responds to may include the wavelength / wavelength band / frequency / frequency band of the visible light component. Also, the electromagnetic wave frequency bands, infrared electromagnetic wave frequency bands, ultraviolet electromagnetic wave frequency bands, 2.4 GHz, 100 MHz, 200 MHz, 300 MHz, 400 MHz, 700 MHz, 800 MHz, and 1200 MHz, which are restricted for general use, may be excluded.

[0091] PC150 of Embodiment 2 is configured as a microprocessor centered on a CPU (not shown), and includes a ROM (not shown) that stores various processing programs, a RAM (not shown) that temporarily stores data, a GPU (not shown) that performs calculation processing and matrix operation processing required for image processing, a hard disk drive (HDD) (not shown) that is a large-capacity memory for storing various data including various application programs (simply referred to as applications) including the electromagnetic wave transmitter detection program according to the present invention, image data, and video data, and an input / output interface (I / F) (not shown) for inputting and outputting data to and from external devices. PC150 is provided with an input device (not shown) such as a keyboard and a mouse through which a user inputs various commands, a display 52 for displaying various information, and the like. The CPU, ROM, RAM, GPU, HDD, I / F, input device, display 52, etc. are electrically connected by a bus (not shown) and are configured to be able to exchange various control signals and data with each other.

[0092] In PC150, as shown in FIG. 13, a video acquisition unit 161, a location identification unit 65, a storage unit 66, an output unit 67, a display unit 68, etc. are configured as functional blocks by the cooperation of one or both of the above-mentioned hardware resources such as the CPU, ROM, RAM, GPU, HDD, I / F, input device, and display 52, and various software such as various applications and programs. In other words, each of these units (video acquisition unit 161, location identification unit 65, storage unit 66, output unit 67, display unit 68) is a function realized by the operation of each component (CPU, ROM, RAM, GPU, HDD, I / F, input device, display 52, etc.) alone or in cooperation according to an instruction from the CPU that executes an application developed from the HDD onto the RAM. Note that the video acquisition unit 161, location identification unit 65, storage unit 66, output unit 67, display unit 68, etc. are electrically connected by bus lines (not shown) such as an address bus and a data bus.

[0093] The video acquisition unit 161 acquires video data captured by the video cameras 110 (see FIG. 11) arranged on each surface of the housing 4, and supplies the acquired video data to the location identification unit 65, the storage unit 66, the output unit 67, etc. in a manner that enables identification of which video camera 110 among the six video cameras 110 captured the data. The video data is an example of an implementation configuration corresponding to the "image" in the present invention.

[0094] The video (image) is, that is to say, an image targeted at visible light and also an image targeted at the wavelength of the electromagnetic waves transmitted by an electromagnetic wave transmitter (for example, a bugging device). In other words, it is an image representing the situation of the detection of the electromagnetic waves transmitted by the electromagnetic wave transmitter, and it may be a color image or a grayscale image.

[0095] The electromagnetic wave transmitter detection device 100 according to the second embodiment may also be provided with a video conversion unit 63 and a video composition unit 64. The video conversion unit 63 of the electromagnetic wave transmitter detection device 100 according to the second embodiment acquires video data from the video acquisition unit 161, converts the video data into monochrome video data with a monochrome tone, and supplies the converted monochrome video data to the video composition unit 64, the location identification unit 65, and the storage unit 66. The monochrome video data is an example of an implementation configuration corresponding to the "monochrome converted image" in the present invention.

[0096] The monochrome video (monochrome converted image) is, that is to say, an image obtained by converting the video (image) supplied from the video acquisition unit 161 into a monochrome tone. The monochrome video (monochrome converted image) is a video (image) having the same characteristics as the monochrome electromagnetic wave video (third image) in the first embodiment.

[0097] The video composition unit 64 of the electromagnetic wave transmitter detection device 100 according to the second embodiment composes the video data from the video acquisition unit 161 and the monochrome video data from the video conversion unit 63, and supplies each composed video data to the storage unit 66 and the output unit 67 in a manner that enables identification of which video camera 110 among the six video cameras 110 captured the data.

[0098] The location specifying unit 65 of the electromagnetic wave transmitter detection device 100 according to Embodiment 2 determines whether a frame in which a eavesdropping device (specifically, an electromagnetic wave transmitted from an eavesdropping device as an electromagnetic wave transmitter) is imaged is included in the video data from the video acquisition unit 161 or the monochrome video data from the video conversion unit 63. If there is a frame in which the eavesdropping device is imaged, the location (i.e., place, position) of the eavesdropping device in the frame is specified.

[0099] Specifically, the location specifying unit 65 determines whether there is a portion that emits white light in each frame of the video data or the monochrome video data by image processing. If there is a portion that emits white light, the portion that emits white light is specified as the location of the eavesdropping device. Then, the location specifying unit 65 supplies the location of the eavesdropping device specified in the frame of the video data or the monochrome video data to the display unit 68 as the position information in the frame.

[0100] When determining whether there is a portion that emits white light (i.e., a portion in which an electromagnetic wave transmitted from an eavesdropping device as an electromagnetic wave transmitter is imaged) in each frame of the monochrome video data, in other words, when determining whether there is a pixel corresponding to the portion that emits white light in each frame of the monochrome video data, a threshold value of the single-color intensity for each pixel may be set, or a threshold value related to the degree of aggregation of pixels may be set.

[0101] The video synthesizing unit 64 of the electromagnetic wave transmitter detection device 100 according to Embodiment 2 generates a synthesized image by, for example, superimposing (in other words, covering) a monochrome video (monochrome converted image; specifically, each frame of the monochrome video data) on a video (image; specifically, each frame of the video data) as a process of synthesizing the video data (image) and the monochrome video data (monochrome converted image).

[0102] The composite image is an image obtained by combining the video (image) supplied from the video acquisition unit 161 and the monochrome video (monochrome conversion image). For example, in a color image (the image supplied from the video acquisition unit 161), a portion where the intensity of the sensed electromagnetic wave is zero (or below a predetermined threshold) is transparent, and a monochrome image (monochrome conversion image) converted so that the color increases according to the intensity of the sensed electromagnetic wave is superimposed.

[0103] The storage unit 66 stores the video data, the monochrome video data, and the composite video data in a manner that enables identification of which of the six video cameras 110 captured the data.

[0104] The output unit 67 outputs the video data and the composite video data to the display unit 68 in a manner that enables identification of which of the six video cameras 110 captured the data.

[0105] The display unit 68 displays the video data and the composite video data from the output unit 67 on the display 52 in a manner that enables identification of which of the six video cameras 110 captured the data. Further, when the video data or the composite video data has a frame including a eavesdropping device, the display unit 68 displays the location of the eavesdropping device specified by the location specifying unit 65 in a visually confirmable manner. In this embodiment, the location of the eavesdropping device is surrounded by a frame and displayed (see FIG. 10).

[0106] Next, the operation of the electromagnetic wave transmitter detection device 100 configured in this way, particularly the operation when detecting an eavesdropping device, will be described. When detecting an eavesdropping device, first, the electromagnetic wave transmitter detection device 100 is installed in a detection target space such as a room suspected of having an eavesdropping device installed.

[0107] When the installation of the electromagnetic wave transmitter detection device 100 in the space to be detected is completed, the imaging device 102 is activated, and the PC 150 is operated to execute the electromagnetic wave transmitter detection program according to the present invention. As a result, the electromagnetic wave transmitter detection program according to the present invention stored in the memory including the ROM is read by the CPU, and information is processed according to the steps instructed by the program, and the electromagnetic wave transmitter detection method according to the present invention is executed.

[0108] When the electromagnetic wave transmitter detection program is executed, first, the video acquisition unit 161 executes a process of acquiring video data from each of the six video cameras 110, and the location identification unit 65 uses the video data or monochrome video data to determine whether the frame in which a eavesdropping device (specifically, the electromagnetic wave transmitted from an eavesdropping device as an electromagnetic wave transmitter) is imaged is included in the video data or monochrome video data.

[0109] Here, the determination of whether the frame in which the eavesdropping device is imaged is included can be performed by the location identification unit 65 performing image processing on each video data or monochrome video data to determine whether there is a portion that emits white light in each frame of the video data or monochrome video data. When it is determined that there is a frame in which the eavesdropping device is imaged in either the video data or the monochrome video data, the location of the eavesdropping device (that is, the place, position) in the frame is identified. Specifically, in the frame, the portion that emits white light is identified as the location of the eavesdropping device. Then, the location identification unit 65 supplies the location of the eavesdropping device identified in the frame of the video data or monochrome video data to the display unit 68 as the position information in the frame.

[0110] Finally, the display unit 68 executes a process of displaying each video data or each synthesized video data on the display 52. At this time, when the frame in which the eavesdropping device is imaged is included in any of the monochrome video data constituting each video data or each synthesized video data, the location of the eavesdropping device is surrounded by a frame and displayed on the corresponding video data or synthesized video data.

[0111] Also in the electromagnetic wave transmitter detection device 100 according to the second embodiment described above, the electromagnetic wave transmitter detection device 1 according to the first embodiment has the same effects, specifically, even a eavesdropping device that transmits electromagnetic waves at random timings, it is possible to surely detect whether the eavesdropping device is installed and its location, and since it is possible to simultaneously detect all directions of the space to be detected, it is possible to detect the eavesdropping device in a short time, and it is possible to easily know the location of the eavesdropping device. Further, according to the electromagnetic wave transmitter detection device 100 according to the second embodiment, since only one video camera 110 is arranged on each surface of the housing 4, it is possible to reduce the number of parts.

Embodiment

[0112] Next, the detection device 200 according to the third embodiment will be described. The detection device 200 according to the third embodiment is configured as a device capable of detecting an electromagnetic wave reflector installed in the ground to be detected, specifically, a landmine. However, the "electromagnetic wave reflector" in the present invention is not limited to landmines, and various devices and objects capable of reflecting electromagnetic waves are widely applicable. The detection device 200 is an example of an implementation configuration corresponding to the "electromagnetic wave reflector detection device" in the present invention.

[0113] The detection device 200 according to the third embodiment is configured to include a mechanism for transmitting electromagnetic waves (electromagnetic wave transmitting unit) in addition to the configuration of the electromagnetic wave transmitter detection device 1 according to the first embodiment or the electromagnetic wave transmitter detection device 100 according to the second embodiment. Then, the detection device 200 transmits electromagnetic waves as transmission waves toward the ground by the electromagnetic wave transmitting unit, and acquires underground data by receiving / receiving the response wave (that is, electromagnetic wave) that has been reflected by the electromagnetic wave reflector, which is the object to be detected existing in the ground. That is, the detection device 200 is configured as a mechanism for detecting the state of the ground in the depth direction. Note that the electromagnetic wave transmitted from the electromagnetic wave transmitting unit toward the ground may be a pulsed electromagnetic wave.

[0114] The operation of the detection device 200 is the same as that of the electromagnetic wave transmitter detection device 1 according to Embodiment 1 or the electromagnetic wave transmitter detection device 100 according to Embodiment 2, except that at the timing of receiving a response wave (i.e., an electromagnetic wave) that has been reflected back by an electromagnetic wave reflector, which is a detection target object existing in the ground, from the electromagnetic wave transmitted as a transmission wave toward the ground, the visible light video acquisition unit 61 and the electromagnetic wave video acquisition unit 62 execute a process of acquiring visible light video data and electromagnetic wave video data from the visible light video camera 10 and the electromagnetic wave video camera 30 respectively (in the case of the configuration corresponding to the electromagnetic wave transmitter detection device 1 according to Embodiment 1), or the video acquisition unit 161 executes a process of acquiring video data from the video camera 110 (in the case of the configuration corresponding to the electromagnetic wave transmitter detection device 100 according to Embodiment 2).

[0115] Note that the camera angles of the visible light video camera 10 and the electromagnetic wave video camera 30 respectively (in the case of the configuration corresponding to the electromagnetic wave transmitter detection device 1 according to Embodiment 1), and the camera angle of the video camera 110 (in the case of the configuration corresponding to the electromagnetic wave transmitter detection device 100 according to Embodiment 2) are adjusted to camera angles that can receive a response wave (i.e., an electromagnetic wave) that has been reflected back by an electromagnetic wave reflector, which is a detection target object existing in the ground, from the electromagnetic wave transmitted as a transmission wave toward the ground from the electromagnetic wave transmission unit. Specifically, for example, they are adjusted to camera angles facing the ground (the ground surface).

[0116] When the detection device 200 detects a landmine in the ground as an electromagnetic wave reflector, the range of the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave transmitted toward the ground (and the electromagnetic wave as a response wave reflected back by the landmine in the ground) is not limited to a specific wavelength / wavelength band / frequency / frequency band. Since there are various types of landmines in the ground, such as those made of plastic or metal, it is appropriately set after considering the materials assumed to be used in the landmines and the composition of the soil in the surface part where the landmines are buried.

[0117] The detection device 200 may be configured to detect water leakage in underground water pipes as an electromagnetic wave reflector. When detecting water leakage, the range of the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave transmitted toward the ground (and also the electromagnetic wave as the response wave reflected by the underground water pipe or the water leaking from the water pipe and returning) is not limited to a specific wavelength / wavelength band / frequency / frequency band. When the detection device 200 detects an underground water pipe or water leakage from a water pipe, the range of the wavelength / wavelength band / frequency / frequency band of the electromagnetic wave transmitted toward the ground (and also the electromagnetic wave as the response wave reflected by the underground water pipe or water) is appropriately set after considering, for example, whether the electromagnetic wave reflection target is the water pipe or the water, the material used for the water pipe, and the soil composition of the land where the water pipe is buried.

[0118] Note that in the electromagnetic wave transmitter detection devices 1 and 100 of the first and second embodiments and the detection device 200 of the third embodiment, the electromagnetic wave transmitter detection devices 1 and 100 and the detection device 200 are configured to include the cameras 2 and 102 and the PCs 50 and 150, but are not limited thereto. The electromagnetic wave transmitter detection devices 1 and 100 and the detection device 200 may be configured such that the camera 2 and 102 has the functions of the PC 50 and 150. That is, the electromagnetic wave transmitter detection devices 1 and 100 and the detection device 200 are not configured to separately include the cameras 2 and 102 and the PCs 50 and 150, and may be configured as a dedicated device in which the cameras 2 and 102 and the PCs 50 and 150 are integrated.

[0119] (Operational effects) According to the electromagnetic wave transmitter detection devices 1 and 100 according to the first and second embodiments (embodiments), since the frame in which the electromagnetic wave transmitted by the electromagnetic wave transmitter is estimated to be imaged is specified from the image converted to monochrome, it is possible to reliably detect the presence and location of the electromagnetic wave transmitter. Further, according to the detection device 200 according to the third embodiment (embodiment), since the frame in which the electromagnetic wave reflected by the electromagnetic wave reflector and returned is estimated to be imaged is specified from the image converted to monochrome, it is possible to reliably detect the presence and location of the electromagnetic wave reflector.

[0120] The embodiments (modes for carrying out) of the present invention have been described above. However, the specific configuration modes of the present invention are not limited to the above embodiments, and forms in which modifications, changes, etc. within the scope not departing from the gist of the present invention are added to the above embodiments are also included in the present invention.

[0121] (Appended Note) According to a preferred form of the first electromagnetic wave type transmitter detection device according to the present invention, it includes a housing, at least one first camera disposed in the housing, and at least one second camera disposed in the housing so as to have a camera position and a camera angle substantially equal to those of the first camera, an image conversion unit, an image synthesis unit, and an output unit. The first camera includes a first image sensor having a light reception sensitivity at the wavelength of the visible light component. The second camera includes a second image sensor having a light reception sensitivity at a wavelength equal to or longer than the wavelength of the infrared component. The image conversion unit can convert the second image captured by the second camera into a monochrome third image. The image synthesis unit generates a synthesized image by synthesizing the first image captured by the first camera and the third image. And the output unit can output the synthesized image generated by the image synthesis unit. Here, the "housing" in the present invention typically corresponds to a box-shaped container, but preferably includes a frame-shaped structure (frame). Further, the "image" in the present invention preferably includes not only still images but also moving images.

[0122] According to the present invention, since the second image sensor has a light reception sensitivity at the wavelength of the electromagnetic wave transmitted by the electromagnetic wave type transmitter, the electromagnetic wave transmitted from the electromagnetic wave type transmitter can be imaged by the second camera. Then, while converting the second image obtained by imaging the electromagnetic wave transmitted from the electromagnetic wave type transmitter into a monochrome third image, and outputting a synthesized image obtained by synthesizing the first image captured by the first camera disposed at a camera position and a camera angle substantially equal to those of the second camera and the third image, it is possible to surely detect not only whether an electromagnetic wave type transmitter such as a eavesdropping device that transmits electromagnetic waves at random timing exists in the space to be detected, but also at which position in the space to be detected the electromagnetic wave type transmitter exists.

[0123] According to a further aspect of the first electromagnetic wave type transmitter detection device according to the present invention, at least the second image is a moving image.

[0124] According to this aspect, it can be more preferably applied to the detection of an electromagnetic wave type transmitter such as a eavesdropping device that transmits electromagnetic waves corresponding to voices at random timings.

[0125] According to a further aspect of the first electromagnetic wave type transmitter detection device according to the present invention, it further includes a frame specifying unit capable of specifying a frame in which an electromagnetic wave type transmitter is presumed to be imaged from the second image. Then, the image conversion unit generates a third image by converting the frame into a monochrome tone.

[0126] According to this aspect, it can be preferably applied even when the first image is a still image.

[0127] According to a further aspect of the first electromagnetic wave type transmitter detection device according to the present invention, the housing is a polyhedron having a plurality of faces. And the first and second cameras are arranged on each of the plurality of faces.

[0128] According to this aspect, since it is possible to simultaneously image all directions of the space to be detected, the presence and location of an electromagnetic wave type transmitter can be detected simply, reliably, and in a short time.

[0129] According to a further aspect of the first electromagnetic wave type transmitter detection device according to the present invention, it further includes a display unit capable of displaying a composite image, and a location specifying unit that specifies the location of the electromagnetic wave type transmitter based on the third image. And the display unit notifies in a manner that allows the location of the electromagnetic wave type transmitter specified by the location specifying unit to be visually confirmed.

[0130] According to this aspect, the presence and position of the electromagnetic wave type transmitter can be notified more reliably.

[0131] According to a preferred embodiment of the second electromagnetic wave transmitter detection device according to the present invention, it includes at least one camera and an output unit capable of outputting an image captured by the camera. The camera has a filter in which a visible light transmitting material capable of transmitting the wavelength of the visible light component and an electromagnetic wave transmitting material capable of transmitting the wavelength of the electromagnetic wave transmitted by the electromagnetic wave transmitter are arranged in a pattern, and an image sensor having a light receiving sensitivity equal to or higher than the wavelength of the visible light component. The "image" in the present invention preferably includes not only still images but also moving images.

[0132] According to the present invention, since the camera has a filter in which a visible light transmitting material capable of transmitting the wavelength of the visible light component and an electromagnetic wave transmitting material capable of transmitting the wavelength of the electromagnetic wave transmitted by the electromagnetic wave transmitter are arranged in a pattern, and an image sensor having a light receiving sensitivity equal to or higher than the wavelength of the visible light component, it is possible to capture an image of the electromagnetic wave transmitted from the electromagnetic wave transmitter in the image of the space of the detection target captured by the camera. As a result, even an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timing can be surely detected not only whether it exists in the space of the detection target but also at which position in the space of the detection target the electromagnetic wave transmitter exists.

[0133] According to a further embodiment of the second electromagnetic wave transmitter detection device according to the present invention, the image is a moving image.

[0134] According to this embodiment, it can be more preferably applied to the detection of electromagnetic wave transmitters such as eavesdropping devices that transmit electromagnetic waves corresponding to voices at random timing.

[0135] According to a further embodiment of the second electromagnetic wave transmitter detection device according to the present invention, it further includes a housing capable of supporting the camera. The housing is a polyhedron having a plurality of faces. And the cameras are arranged on each of the plurality of faces.

[0136] According to this embodiment, since it is possible to simultaneously capture images in all directions of the space of the detection target, the presence or absence and location of the electromagnetic wave transmitter can be detected simply, surely, and in a short time.

[0137] According to a further aspect of the second electromagnetic wave transmitter detection device according to the present invention, it further includes a display unit capable of displaying an image, and a location identification unit that identifies the location of the electromagnetic wave transmitter based on the image. The display unit notifies in a manner that allows visual confirmation of the location of the electromagnetic wave transmitter identified by the location identification unit.

[0138] According to this aspect, the presence or absence and the position of the electromagnetic wave transmitter can be more reliably notified.

[0139] According to a preferred aspect of the first electromagnetic wave transmitter detection method according to the present invention, (a) at least one first camera including a first image sensor having a light reception sensitivity at the wavelength of the visible light component, and at least one second camera including a second image sensor having a light reception sensitivity at the wavelength of the electromagnetic wave transmitted by the electromagnetic wave transmitter are arranged so as to have substantially equal camera positions and camera angles; (b) the first and second cameras image the space to be detected; (c) the second image captured by the second camera is converted into a monochrome third image; (d) a composite image is generated by combining the first image captured by the first camera and the third image; (e) the generated composite image is output. Here, the "image" in the present invention preferably includes not only still images but also moving images.

[0140] According to the present invention, since the second image sensor has a light reception sensitivity at the wavelength of the electromagnetic wave transmitted by the electromagnetic wave transmitter, the electromagnetic wave transmitted from the electromagnetic wave transmitter can be imaged by the second camera. Then, the second image capturing the electromagnetic wave transmitted from the electromagnetic wave transmitter is converted into a monochrome third image, and a composite image is output by combining the first image captured by the first camera arranged at substantially the same camera position and camera angle as the second camera and the third image. Therefore, even an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timing can be reliably detected not only whether it exists in the space to be detected but also at which position in the space to be detected the electromagnetic wave transmitter exists.

[0141] According to a further aspect of the first electromagnetic wave transmitter detection method according to the present invention, step (b) includes a step of capturing at least a second image as a moving image.

[0142] According to this aspect, it can be more preferably applied to the detection of an electromagnetic wave transmitter such as a eavesdropping device that transmits an electromagnetic wave corresponding to a voice at random timing.

[0143] According to a preferred aspect of the second electromagnetic wave transmitter detection method according to the present invention, (f) a step of imaging a space to be detected by at least one camera including a filter in which a visible light transmitting material capable of transmitting a wavelength of a visible light component and an electromagnetic wave transmitting material capable of transmitting a wavelength of an electromagnetic wave transmitted by the electromagnetic wave transmitter are patterned and arranged, and an imaging device having a light receiving sensitivity equal to or higher than the wavelength of the visible light component; and (g) a step of outputting an image of the space to be detected imaged by the camera. Here, the "image" in the present invention preferably includes not only a still image but also a moving image.

[0144] According to the present invention, in order to image a space to be detected by a camera having a filter in which a visible light transmitting material capable of transmitting a wavelength of a visible light component and an electromagnetic wave transmitting material capable of transmitting a wavelength of an electromagnetic wave transmitted by the electromagnetic wave transmitter are patterned and arranged, and an imaging device having a light receiving sensitivity equal to or higher than the wavelength of the visible light component, an electromagnetic wave transmitted from the electromagnetic wave transmitter can be imaged in an image of the space to be detected. As a result, even an electromagnetic wave transmitter such as an eavesdropping device that transmits an electromagnetic wave at random timing can be surely detected not only whether it exists in the space to be detected but also at which position in the space to be detected the electromagnetic wave transmitter exists.

[0145] According to a further aspect of the second electromagnetic wave transmitter detection method according to the present invention, step (f) includes a step of capturing at least an image as a moving image.

[0146] According to this embodiment, it can be more preferably applied to detecting an electromagnetic wave transmitter such as a bug that transmits electromagnetic waves corresponding to voice at random timings.

[0147] According to a preferred form of the first electromagnetic wave transmitter detection program according to the present invention, at least steps (b) to (e) of the electromagnetic wave transmitter detection method according to any of the above-described present inventions are executed by a computer. The program may be recorded on a computer-readable recording medium, for example, a hard disk, ROM, SSD, flash memory (such as a USB memory, SD card), floppy disk, CD, DVD, etc., or may be distributed from one computer to another computer via a transmission medium, for example, a communication network such as the Internet or a LAN, or may be transferred in any other manner.

[0148] According to the present invention, it has the same effects as those achieved by the electromagnetic wave transmitter detection method according to the present invention described above. For example, even for an electromagnetic wave transmitter such as a bug that transmits electromagnetic waves at random timings, it can not only detect whether it exists in the space to be detected, but also reliably detect at which position in the space to be detected the electromagnetic wave transmitter exists.

[0149] According to a preferred form of the second electromagnetic wave transmitter detection program according to the present invention, the electromagnetic wave transmitter detection method according to any of the above-described present inventions is executed by a computer. The program may be recorded on a computer-readable recording medium, for example, a hard disk, ROM, SSD, flash memory (such as a USB memory, SD card), floppy disk, CD, DVD, etc., or may be distributed from one computer to another computer via a transmission medium, for example, a communication network such as the Internet or a LAN, or may be transferred in any other manner.

[0150] According to the present invention, the present invention can achieve the same effects as those of the electromagnetic wave transmitter detection method according to the present invention described above. For example, even for an electromagnetic wave transmitter such as a eavesdropping device that transmits electromagnetic waves at random timings, it is possible to not only detect whether the electromagnetic wave transmitter exists in the space to be detected, but also reliably detect at which position in the space to be detected the electromagnetic wave transmitter exists.

Explanation of Signs

[0151] 1 Electromagnetic wave transmitter detection device (electromagnetic wave transmitter detection device of Embodiment 1) 2 Imaging device 4 Housing (housing) 6 Support legs 10 Visible light video camera (first camera) 12 Lens 13 Color filter 14 Image sensor (first imaging element) 16 Image processing engine 18 Video output terminal 20 Recording medium 22 Audio receiving unit 24 Liquid crystal monitor 26 Finder 28 Camera body 30 Electromagnetic wave video camera (second camera) 32 Lens 34 Image sensor (second imaging element) 36 Image processing engine 38 Video output terminal 44 Camera body 46 Band-pass filter 50 PC 52 Display 61 Visible light video acquisition unit 62 Electromagnetic wave video acquisition unit 63 Video conversion unit (image conversion unit) 64 Video synthesis unit (image synthesis unit) 65 Location identification unit (frame identification unit, location identification unit) 66 Storage unit 67 Output unit (output unit) 68 Display unit (display unit) 80 Adapter 82 Cable 100 Electromagnetic wave transmitter detection device (electromagnetic wave transmitter detection device of Example 2) 102 Imaging device 110 Video camera (camera) 112 Lens 113 Filter (filter) 114 Image sensor (imaging element) 116 Image processing engine 118 Video output terminal 120 Recording medium 122 Audio receiving section 124 Camera body 161 Moving image acquisition section 200 Detection device (electromagnetic wave reflector detection device of Example 3)

Claims

1. A mine detection device for detecting underground mines, A housing and an electromagnetic wave transmitting unit that transmits electromagnetic waves underground; At least one first camera including a first image sensor having light receiving sensitivity to a wavelength of a visible light component and disposed in the housing; at least one second camera including a second image sensor having a light receiving sensitivity set in accordance with the frequency of a response wave that is the electromagnetic wave emitted from the electromagnetic wave emitting unit and reflected by the landmine and returns, and the second camera is disposed on the housing so as to have a camera position and a camera angle substantially equal to those of the first camera; an image conversion unit capable of converting a second image captured by the second camera into a monochrome third image; an image synthesis unit that generates a synthetic image by overlaying the third image on the first image captured by the first camera; an output unit capable of outputting the composite image generated by the image synthesis unit, the third image is an image which is converted so that a portion where the intensity of the detected electromagnetic wave is zero is transparent and a density of a predetermined monochromatic color is darkened according to the intensity of the detected electromagnetic wave, a predetermined minimum value and a maximum value are set for the intensity of the electromagnetic wave, and all portions where the intensity of the detected electromagnetic wave is equal to or less than the minimum value are transparent, and all portions where the intensity of the detected electromagnetic wave is equal to or more than the maximum value are the maximum density of the density range of the monochromatic color; Landmine detection equipment.

2. A display unit capable of displaying the composite image; a location identifying unit that identifies the location of the landmine based on the third image; Further equipped with The display unit notifies the location of the mine identified by the location identifying unit in a manner that allows the location to be visually confirmed.

2. A mine detection device according to claim 1.

3. A mine detection device for detecting underground mines, an electromagnetic wave transmitting unit that transmits electromagnetic waves underground; at least one camera comprising: a filter in which a visible light transmitting material capable of transmitting wavelengths of visible light components and an electromagnetic wave transmitting material capable of transmitting a wavelength set in accordance with the frequency of a reply wave that is the electromagnetic wave transmitted from the electromagnetic wave transmitting unit and reflected by the landmine and returned, are arranged in a pattern; and an image sensor having light receiving sensitivity to the wavelengths that pass through the filter; an image conversion unit capable of converting an image captured by the camera into a monochrome converted image with a monochrome tone; an image synthesis unit that generates a synthetic image by overlaying the monochrome converted image on the image captured by the camera; an output unit capable of outputting the composite image generated by the image synthesis unit, The monochrome converted image is an image converted so that a portion where the intensity of the sensed electromagnetic wave is zero is transparent and a predetermined monochromatic density is darkened according to the intensity of the sensed electromagnetic wave, a predetermined minimum value and a maximum value are set for the intensity of the electromagnetic wave, and all portions where the intensity of the sensed electromagnetic wave is equal to or less than the minimum value are transparent, and all portions where the intensity of the sensed electromagnetic wave is equal to or greater than the maximum value are the maximum density of the monochromatic density range. Landmine detection equipment.

4. A display unit capable of displaying the composite image; a location identification unit that identifies the location of the mine based on the monochrome converted image; Further equipped with The display unit notifies the location of the mine identified by the location identifying unit in a manner that allows the location to be visually confirmed.

4. A mine detection device according to claim 3.

5. A mine detection method for detecting a mine present in the ground, comprising the steps of: (a) arranging at least one first camera having a first image sensor having a light sensitivity to a wavelength of a visible light component and at least one second camera having a second image sensor having a predetermined light sensitivity so as to have substantially equal camera positions and camera angles; (b) transmitting electromagnetic waves from an electromagnetic wave transmission unit toward the ground; (c) imaging an underground area to be detected by the first and second cameras; (d) converting the second image captured by the second camera into a monochrome third image; (e) generating a composite image by overlaying the third image on the first image captured by the first camera; (f) outputting the generated composite image; the second imaging element has a light receiving sensitivity set in accordance with a frequency of a response wave that is an electromagnetic wave transmitted from the electromagnetic wave transmission unit and reflected by the landmine and returned; the third image is an image which is converted so that a portion where the intensity of the detected electromagnetic wave is zero is transparent and a density of a predetermined monochromatic color is darkened according to the intensity of the detected electromagnetic wave, a predetermined minimum value and a maximum value are set for the intensity of the electromagnetic wave, and all portions where the intensity of the detected electromagnetic wave is equal to or less than the minimum value are transparent, and all portions where the intensity of the detected electromagnetic wave is equal to or more than the maximum value are the maximum density of the density range of the monochromatic color; Landmine detection method.

6. The step (c) includes a step of capturing at least the second image as a moving image.

6. A method for detecting land mines according to claim 5.

7. A mine detection program for detecting mines present in the ground, comprising:

7. A mine detection program for causing a computer to execute at least the steps (b) to (f) of the mine detection method according to claim 5 or 6.

8. A mine detection method for detecting a mine present in the ground, comprising the steps of: (g) transmitting electromagnetic waves from the electromagnetic wave transmission unit toward the ground; (h) capturing an image of the underground area to be detected by at least one camera having a filter in which a visible light transmitting material capable of transmitting wavelengths of visible light components and an electromagnetic wave transmitting material capable of transmitting a predetermined wavelength are arranged in a pattern, and an image sensor having a light receiving sensitivity to the wavelengths transmitted by the filter; (i) converting an image captured by the camera into a monochrome converted image; (j) generating a composite image by overlaying the monochrome converted image on an image captured by the camera; (k) outputting the generated composite image; the electromagnetic wave transmitting material is capable of transmitting a wavelength set in accordance with the frequency of a reply wave that is the electromagnetic wave transmitted from the electromagnetic wave transmitting unit and reflected by the landmine; The monochrome converted image is an image converted so that a portion where the intensity of the sensed electromagnetic wave is zero is transparent and a predetermined monochromatic density is darkened according to the intensity of the sensed electromagnetic wave, a predetermined minimum value and a maximum value are set for the intensity of the electromagnetic wave, and all portions where the intensity of the sensed electromagnetic wave is equal to or less than the minimum value are transparent, and all portions where the intensity of the sensed electromagnetic wave is equal to or greater than the maximum value are the maximum density of the monochromatic density range. Landmine detection method.

9. The step (h) includes at least a step of capturing the image as a video.

9. A method for detecting land mines according to claim 8.

10. A mine detection program for detecting mines present in the ground, comprising: A mine detection program for causing a computer to execute the mine detection method according to claim 8 or 9.

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