Radio wave-type transmitter detection device, radio wave-type transmitter detection method, and radio wave-type transmitter detection program

Abstract

[PROBLEM] To reliably detect the presence and location of a radio wave transmitter. [SOLUTION] A space to be detected is imaged by a visible light video camera 10, which includes an image sensor 14 having light receiving sensitivity with respect to the wavelengths of visible light components, and a radio wave video camera 30, which includes an image sensor 34 having light receiving sensitivity with respect to the wavelengths of radio waves transmitted by eavesdropping devices. 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 substantially the same position and angle as the visible light video camera 10. Thus, it is possible to reliably detect whether and where eavesdropping devices are installed.

Description

Radio wave transmitter detection device, radio wave transmitter detection method, and radio wave transmitter detection program

[0001] The present invention relates to a radio wave transmitter detection device, a radio wave transmitter detection method, and a radio wave transmitter detection program for detecting a radio wave transmitter.

[0002] Japanese Patent Laid-Open Publication No. 2001-7771 (Patent Document 1) describes a radio wave transmitter detection device that includes a single-shot signal generator that generates a single-shot signal, a receiver / demodulator circuit that receives and demodulates radio waves transmitted from a radio wave transmitter such as a bugging device when the radio wave transmitter receives 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 to when the receiver / demodulator circuit receives and demodulates the radio waves corresponding to the single-shot signal and outputs them, and a timing generator that changes the timing until the next single-shot signal is generated according to the detected delay time.

[0003] This device operates so that the period of the single signal becomes longer when moving away from a radio wave transmitter such as a bugging device, and becomes shorter when approaching the device, so that the location of a radio wave transmitter such as a bugging device can be reliably found with a simple circuit configuration.

[0004] Japanese Patent Application Laid-Open No. 2001-7771

[0005] In recent years, there has been an emergence of wiretaps and other radio wave transmitters that do not transmit radio waves corresponding to audio containing a single signal at the timing when the audio containing the single signal is received, but transmit radio waves corresponding to the audio at a timing different from the timing when the audio containing the single signal is received, i.e., at random timing. With such wiretaps, it is unclear at what timing the radio waves will be transmitted, so the radio wave transmitter detection device described in the above publication cannot cope with this, and there is still room for improvement in terms of detection performance.

[0006] The present invention has been made in consideration of the above, and one of its objects is to provide a radio wave transmitter detection device, a radio wave transmitter detection method, and a radio wave transmitter detection program that can reliably detect the presence and location of a radio wave transmitter.

[0007] The radio wave transmitter detection device, radio wave transmitter detection method, and radio wave transmitter detection program of the present invention employ the following means to achieve the above-mentioned object.

[0008] According to a preferred embodiment of the first radio wave transmitter detection device of the present invention, the device comprises a housing, at least one first camera disposed in the housing, at least one second camera disposed in the housing so as to have a camera position and 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 comprises a first imaging element having a light-receiving sensitivity to wavelengths of visible light components. The second camera comprises a second imaging element having a light-receiving sensitivity to wavelengths of infrared components or higher. The image conversion unit is capable of converting a second image captured by the second camera into a monochrome third image. The image synthesis unit generates a composite image by combining the first image captured by the first camera with the third image. The output unit is capable of outputting the composite image generated by the image synthesis unit. Here, the "housing" in the present invention typically corresponds to a box-shaped container, but preferably also includes a frame-shaped structure (frame body). Furthermore, 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 light sensitivity to the wavelength of the electromagnetic waves emitted by the radio wave transmitter, the radio waves transmitted from the radio wave transmitter can be captured by the second camera. The second image captured of the radio waves transmitted from the radio 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 positioned at approximately the same camera position and camera angle as the second camera with the third image. Therefore, even if the radio wave transmitter is a bug that transmits radio waves at random timing, it is possible to reliably detect not only whether it is present in the space to be detected, but also where in the space to be detected the radio wave transmitter is located.

[0010] According to a further aspect of the first radio wave transmitter detection device of the present invention, at least the second image is a moving image.

[0011] According to this embodiment, it is more suitable for use in detecting radio wave transmitters such as bugging devices that transmit radio waves corresponding to voices at random timing.

[0012] According to a further aspect of the first radio wave transmitter detection device of the present invention, the device further includes a frame identification unit capable of identifying a frame in which the radio wave transmitter is presumed to have been captured from the second image, and the image conversion unit converts the frame into a monochrome image to generate a third image.

[0013] This aspect is also applicable to cases where the first image is a still image.

[0014] According to a further aspect of the first radio wave transmitter detection device of the present invention, the housing is a polyhedron having a plurality of faces, and the first and second cameras are disposed on each of the faces.

[0015] According to this embodiment, images can be captured simultaneously in all directions in the space to be detected, so that the presence or absence and location of a radio wave transmitter can be detected simply, reliably, and in a short time.

[0016] According to a further aspect of the first radio wave transmitter detection device of the present invention, the device further includes a display unit capable of displaying the composite image and a location determination unit that determines the location of the radio wave transmitter based on the third image, and the display unit notifies the user of the location of the radio wave transmitter determined by the location determination unit in a manner that allows the user to visually confirm the location.

[0017] According to this embodiment, the presence or absence of a radio wave transmitter and its location can be more reliably notified.

[0018] According to a preferred embodiment of the second radio wave transmitter detection device of the present invention, the device comprises 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 transparent material capable of transmitting wavelengths of visible light components and a radio wave transparent material capable of transmitting wavelengths of electromagnetic waves emitted by the radio wave transmitter are arranged in a pattern, and an image sensor having a light receiving sensitivity equal to or greater than the wavelength of the visible light components. In the present invention, the term "image" preferably includes not only still images but also moving images.

[0019] According to the present invention, the camera has a filter in which a visible light transmitting material that can transmit the wavelengths of visible light components and a radio wave transmitting material that can transmit the wavelengths of electromagnetic waves emitted by a radio wave transmitter are arranged in a pattern, and an image sensor with a light receiving sensitivity equal to or greater than the wavelengths of visible light components, so that radio waves transmitted from the radio wave transmitter can be captured in the image of the space to be detected captured by the camera. This makes it possible to reliably detect not only whether a radio wave transmitter, such as a bug that transmits radio waves at random times, is present in the space to be detected, but also where in the space to be detected the radio wave transmitter is located.

[0020] According to a further embodiment of the second radio wave transmitter detection device of the present invention, the image is a moving image.

[0021] According to this embodiment, it is more suitable for use in detecting radio wave transmitters such as bugging devices that transmit radio waves corresponding to voices at random timing.

[0022] According to a further embodiment of the second radio wave transmitter detection device of the present invention, the device further comprises a housing capable of supporting a camera, the housing being a polyhedron having a plurality of faces, and a camera being disposed on each of the faces.

[0023] According to this embodiment, images can be captured simultaneously in all directions in the space to be detected, so that the presence or absence and location of a radio wave transmitter can be detected simply, reliably, and in a short time.

[0024] According to a further embodiment of the second radio wave transmitter detection device of the present invention, the device further includes a display unit capable of displaying an image, and a location identification unit that identifies the location of the radio wave transmitter based on the image, and the display unit notifies the user of the location of the radio wave transmitter identified by the location identification unit in a manner that allows the user to visually confirm the location.

[0025] According to this embodiment, the presence or absence of a radio wave transmitter and its location can be more reliably notified.

[0026] According to a preferred embodiment of the first radio wave transmitter detection method of the present invention, the method includes the steps of: (a) arranging at least one first camera having a first image sensor having sensitivity to wavelengths of visible light components and at least one second camera having a second image sensor having sensitivity to wavelengths of electromagnetic waves emitted by the radio wave transmitter so that the camera positions and camera angles are approximately equal; (b) capturing an image of the space to be detected using the first and second cameras; (c) converting the second image captured by the second camera into a monochrome third image; (d) generating a composite image by combining the first image captured by the first camera and the third image; and (e) outputting the generated composite image. Here, the term "image" in the present invention preferably includes not only still images but also moving images.

[0027] According to the present invention, since the second imaging element has a light receiving sensitivity to the wavelength of the electromagnetic waves emitted by the radio wave transmitter, the radio waves transmitted from the radio wave transmitter can be captured by the second camera. The second image captured of the radio waves transmitted from the radio 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 positioned at approximately the same camera position and camera angle as the second camera with the third image. Therefore, even if the radio wave transmitter is a bug that transmits radio waves at random timing, it is possible to reliably detect not only whether it is present in the space to be detected, but also where in the space to be detected the radio wave transmitter is located.

[0028] According to a further embodiment of the first radio wave transmitter detection method of the present invention, step (b) includes the step of capturing at least the second image as a moving image.

[0029] According to this embodiment, it is more suitable for use in detecting radio wave transmitters such as bugging devices that transmit radio waves corresponding to voices at random timing.

[0030] According to a preferred embodiment of the second radio wave transmitter detection method of the present invention, the method comprises the steps of: (f) capturing an image of the space to be detected using at least one camera equipped with a filter in which a visible light transmitting material capable of transmitting the wavelengths of visible light components and a radio wave transmitting material capable of transmitting the wavelengths of electromagnetic waves emitted by the radio wave transmitter are arranged in a pattern, and an image sensor having a light receiving sensitivity equal to or greater than the wavelengths of the visible light components; and (g) outputting the image of the space to be detected captured by the camera. Here, the term "image" in the present invention preferably includes not only still images but also moving images.

[0031] According to the present invention, a camera having a filter in which a visible light transmitting material that can transmit the wavelengths of visible light components and a radio wave transmitting material that can transmit the wavelengths of electromagnetic waves emitted by a radio wave transmitter are arranged in a pattern, and an image sensor having a light receiving sensitivity equal to or greater than the wavelengths of visible light components, is used to image the space to be detected, so that the radio waves transmitted from the radio wave transmitter can be imaged in the image of the space to be detected.As a result, even if a radio wave transmitter such as a bug that transmits radio waves at random timing is present in the space to be detected, it is possible to reliably detect not only whether it is present in the space to be detected, but also where in the space to be detected the radio wave transmitter is located.

[0032] According to a further embodiment of the second radio wave transmitter detection method of the present invention, step (f) includes at least the step of capturing the image as a moving image.

[0033] According to this embodiment, it is more suitable for application to the detection of radio wave transmitters such as bugging devices that transmit radio waves corresponding to voices at random timing.

[0034] According to a preferred embodiment of the first radio wave transmitter detection program of the present invention, the program causes a computer to execute at least steps (b) through (e) of any of the radio wave transmitter detection methods of the present invention described above. The program may be recorded on a computer-readable recording medium, such as a hard disk, ROM, SSD, flash memory (such as a USB memory or SD card), floppy disk, CD, or DVD, or may be distributed from one computer to another via a transmission medium, such as a communication network such as the Internet or a LAN, or may be transmitted in any other manner.

[0035] According to the present invention, it is possible to achieve the same effects as those achieved by the radio wave transmitter detection method of the present invention described above, such as the effect of being able to reliably detect not only whether a radio wave transmitter such as a bug that transmits radio waves at random timing is present in the space to be detected, but also where in the space to be detected the radio wave transmitter is present.

[0036] According to a preferred embodiment of the second radio wave transmitter detection program of the present invention, a computer is caused to execute any one of the radio wave transmitter detection methods of the present invention described above. The program may be recorded on a computer-readable recording medium, such as a hard disk, ROM, SSD, flash memory (such as a USB memory or SD card), floppy disk, CD, or DVD, or may be distributed from one computer to another via a transmission medium, such as a communication network such as the Internet or a LAN, or may be transmitted in any other manner.

[0037] According to the present invention, it is possible to achieve the same effects as those achieved by the radio wave transmitter detection method of the present invention described above, such as the effect of being able to reliably detect not only whether a radio wave transmitter such as a bug that transmits radio waves at random timing is present in the space to be detected, but also where in the space to be detected the radio wave transmitter is present.

[0038] According to the present invention, the presence and location of a radio wave transmitter can be reliably detected.

[0039] 1 is a schematic diagram showing an outline of the configuration of a radio wave transmitter detection device 1 according to a first embodiment of the present invention. FIG. 1 is a schematic diagram showing an outline of the configuration of a visible light video camera 10. FIG. 1 is a schematic diagram showing an outline of the configuration of a radio wave video camera 30. FIG. 2 is a functional block diagram showing the functional configuration of a radio wave transmitter detection device 1 according to a first embodiment of the present invention. FIG. 3 is an explanatory diagram showing an example of one frame of visible light video data. FIG. 4 is an explanatory diagram showing an example of one frame of radio wave video data. FIG. 5 is an explanatory diagram showing an example of one frame of synthesized video data. FIG. 6 is an explanatory diagram showing an example of one frame of visible light video data. FIG. 7 is an explanatory diagram showing an example of one frame of radio wave video data. FIG. 8 is an explanatory diagram showing an example of one frame of visible light video data.

[0040] Next, the best mode for carrying out the present invention will be described using examples.

[0041] 1, the radio wave transmitter detection device 1 according to the first embodiment is configured as a device capable of detecting a radio wave transmitter, specifically, a bugging device, installed in a space to be detected, such as a room, and includes an image capture device 2 that captures images of the space to be detected, and a personal computer (hereinafter referred to as "PC") 50 that is connected by wire to the image capture device 2. In this embodiment, the image capture device 2 and the PC 50 are connected by wire, but it goes without saying that the image capture device 2 and the PC 50 may also be connected wirelessly. The bugging device is an example of an embodiment corresponding to the "radio wave transmitter" of the present invention.

[0042] As shown in Fig. 1, the imaging device 2 has a housing 4 and a visible light video camera 10 and a radio wave video camera 30 arranged on each side of the housing 4. The housing 4 is configured as a polyhedron having six sides. Four support legs 6, 6, 6, 6 are detachably attached to the bottom of the housing 4. In this embodiment, the imaging device 2 is configured to capture images in a stationary state with the support legs 6, 6, 6, 6 attached to the housing 4, but it goes without saying that the imaging device 2 may also be configured to capture images while held in hand.

[0043] As shown in FIG. 2 , the visible light video camera 10 is configured as a typical digital video camera, and includes a lens 12, an image sensor 14 with a color filter 13, an image processing engine 16 electrically connected to the image sensor 14, a video output terminal 18 electrically connected to the image processing engine 16, a recording medium 20, an audio receiver 22, an LCD monitor 24, and a viewfinder 26, and a camera body 28 housing these components. In this embodiment, the image sensor 14 is configured using a CMOS semiconductor light-receiving element primarily composed of silicon, and has light-receiving sensitivity in the wavelength range of visible light components, specifically, 360 nm to 700 nm. The image processing engine 16 converts the video data generated by the image sensor 14 into a file that can be viewed as a video. The image processing engine 16 then associates the converted image and video with the audio signal received by the audio receiver 22 and outputs the resulting file to the PC 50 via the video output terminal 18 and to the recording medium 20. Furthermore, the image processing engine 16 outputs the images and videos converted into viewable files to the LCD monitor 24 and the viewfinder 26. The video output terminal 18 and the PC 50 are connected by a cable 82 via an adapter 80 (see FIG. 1). The visible light video camera 10 corresponds to the "first camera" of the present invention, and the image sensor 14 is an example of an embodiment corresponding to the "first image sensor" of the present invention.

[0044] As shown in FIG. 3 , the radio 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 housing these components, and a bandpass filter 46 attached in front of the lens 32. In this embodiment, the image sensor 34 has a light receiving sensitivity in the wavelength range of radio waves emitted by a bug, specifically, in the range of 145 MHz to 430 MHz. This allows it to receive and capture radio waves emitted by the bug, thereby enabling the location of the bug to be detected. The image processing engine 36 converts the video data generated by the image sensor 34 into a file that can be viewed as a video. The image processing engine 36 also outputs the converted images and videos to the PC 50 via the video output terminal 38 and to the recording medium 20. The video output terminal 38 and the PC 50 are connected by a cable 82 via an adapter 80 (see FIG. 1). The band pass filter 46 has the property of transmitting wavelengths of 700 nm or more. In other words, the band pass filter 46 is configured as a filter that does not transmit visible light but transmits wavelengths of far infrared rays or more. The radio wave video camera 30 corresponds to the "second camera" of the present invention, and the image sensor 34 is an example of an embodiment corresponding to the "second imaging element" of the present invention.

[0045] The PC 50 is configured as a microprocessor centered around a CPU (not shown), and includes a ROM (not shown) for storing various processing programs, a RAM (not shown) for temporarily storing data, a GPU (not shown) for performing calculations and matrix operations necessary for image processing, a hard disk (HDD) (not shown) which is a large-capacity memory for storing various application programs (simply referred to as applications) including the radio wave transmitter detection program of the present invention, and various data including image data and video data, and an input / output interface (I / F) (not shown) for inputting and outputting data to and from external devices. The PC 50 also includes input devices (not shown) such as a keyboard and mouse through which a user inputs various commands, and a display 52 for displaying 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 exchange various control signals and data with each other. In PC 50, 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, work in cooperation with one or both of them to form functional blocks, such as a visible light video acquisition unit 61, a radio wave video acquisition unit 62, a video conversion unit 63, a video composition unit 64, a location determination unit 65, a storage unit 66, an output unit 67, and a display unit 68, as shown in Fig. 4. In other words, these units (visible light video acquisition unit 61, radio wave video acquisition unit 62, video conversion unit 63, video composition unit 64, location determination unit 65, storage unit 66, output unit 67, and display unit 68) are functions realized by the individual or cooperative operation of the respective components (CPU, ROM, RAM, GPU, HDD, I / F, input device, display 52, etc.) in response to instructions from the CPU that executes applications loaded from the HDD onto the RAM. The visible light video acquisition unit 61, radio wave video acquisition unit 62, video conversion unit 63, video synthesis unit 64, location determination unit 65, memory 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.

[0046] 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 housing 4, and supplies the acquired visible light video data to video synthesis unit 64, storage unit 66, etc. in a manner that makes it possible to identify which of the six visible light video cameras 10 captured the video. Visible light video data is an example of an embodiment corresponding to a "first image" in the present invention.

[0047] The radio wave video acquisition unit 62 acquires radio wave video data captured by the radio wave video cameras 30 (see FIG. 1) arranged on each side of the housing 4, and supplies the acquired radio wave video data to the video conversion unit 63, video synthesis unit 64, storage unit 66, etc. in a manner that makes it possible to identify which of the six radio wave video cameras 30 captured the data. The radio wave video data is an example of an embodiment corresponding to the "second image" of the present invention.

[0048] The video converter 63 acquires the radio wave video data from the radio wave video acquirer 62, converts the radio wave video data into monochrome radio wave video data, and supplies the converted monochrome radio wave video data to the location identifier 65 and the memory 66. The video converter 63 is an example of an embodiment corresponding to the "image converter" in the present invention. The monochrome radio wave video data is an example of an embodiment corresponding to the "third image" in the present invention.

[0049] The moving image composition unit 64 combines the visible light moving image data from the visible light moving image acquisition unit 61 with the monochrome radio wave moving image data from the moving image conversion unit 63, and supplies each piece of combined moving image data to the storage unit 66 and the output unit 67 in a manner that makes it possible to identify which of the six visible light video cameras 10 and six radio wave video cameras 30 captured the image. The moving image composition unit 64 is an example of an embodiment corresponding to the "image composition unit" of this invention.

[0050] The location determination unit 65 uses the monochrome radio wave video data from the video conversion unit 63 to determine whether the monochrome radio wave video data includes a frame in which a bug is captured, and if a frame in which a bug is captured is found, identifies the location of the bug in that frame. Specifically, the location determination unit 65 determines through image processing whether each frame of the monochrome radio wave video data contains a white-lighted area, and if a white-lighted area is found, identifies the white-lighted area as the location of the bug. The location determination unit 65 then supplies the identified location of the bug to the display unit 68. The location determination unit 65 is an example of an embodiment corresponding to the "frame determination unit" and "location determination unit" of the present invention.

[0051] The storage unit 66 stores the visible light video data, radio wave video data, monochrome radio wave video data, and composite video data in a manner that makes it possible to identify which of the six visible light video cameras 10 and six radio wave video cameras 30 the image was taken by.

[0052] The output unit 67 outputs the composite video data generated in the video synthesis unit 64 to the display unit 68 in a manner that makes it possible to identify which of the six visible light video cameras 10 and six radio wave video cameras 30 the image was captured by.

[0053] 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 six radio wave video cameras 30 the image was captured by. Furthermore, when the composite video data includes a frame containing a bug, the display unit 68 displays the location of the bug identified by the location identification unit 65 in a manner that enables visual confirmation. In this embodiment, the location of the bug is displayed by enclosing it in a frame (see FIG. 10 ).

[0054] Next, the operation of the radio wave transmitter detection device 1 configured as described above, particularly the operation when detecting a bug, will be described. To detect a bug, the radio wave transmitter detection device 1 is first installed in the space to be detected, such as a room where a bug is suspected. Once the radio wave transmitter detection device 1 has been installed in the space to be detected, the imaging device 2 is started and the PC 50 is operated to execute the radio wave transmitter detection program of the present invention. This causes the CPU to read the radio wave transmitter detection program of the present invention stored in memory including the ROM, and processes information according to the steps instructed by the program, thereby executing the radio wave transmitter detection method of the present invention.

[0055] When the radio wave transmitter detection program is executed, first, visible light video acquisition unit 61 and radio wave video acquisition unit 62 execute a process of acquiring visible light video data and radio wave video data from each of six visible light video cameras 10 and six radio wave video cameras 30. Next, video conversion unit 63 acquires each of the radio wave video data acquired by radio wave video acquisition unit 62 and executes a process of converting each of the radio wave video data into monochrome radio wave video data.

[0056] When the monochrome radio wave video data is generated, video composition unit 64 generates composite video data by combining each visible light video data acquired by visible light video acquisition unit 61 with each corresponding monochrome radio wave video data. Output unit 67 then executes a process of outputting each generated composite video data to display unit 68.

[0057] Meanwhile, the location determination unit 65 uses each generated monochrome radio wave video data to determine whether the monochrome radio wave video data contains a frame in which a bug is captured. The determination of whether a frame in which a bug is captured is made by the location determination unit 65 performing image processing on each monochrome radio wave video data to determine whether each frame of the monochrome radio wave video data contains a white light. If it determines that any of the monochrome radio wave video data contains a frame in which a bug is captured, the location determination unit 65 identifies the location of the bug in that frame. Specifically, the location determination unit 65 identifies the white light in that frame as the location of the bug. The location determination unit 65 then supplies the identified location of the bug to the display unit 68.

[0058] Finally, the display unit 68 executes a process of displaying each piece of composite video data on the display 52. ​​At this time, if any of the monochrome radio wave video data constituting each piece of composite video data includes a frame in which a bug is captured, the display unit 68 displays the location of the bug in a frame on the corresponding composite video data.

[0059] Figures 5 and 8 are explanatory diagrams showing an example of one frame of first and second visible light video data captured by any two of the six visible light video cameras 10 (hereinafter, for convenience, these may be referred to as the "first visible light video camera" and the "second visible light video camera"); Figures 6 and 9 are explanatory diagrams showing an example of one frame of first and second monochrome radio wave video data obtained by converting the first and second radio wave video data captured by two radio wave video cameras 30 (hereinafter, for convenience, these may be referred to as the "first radio wave video camera" and the "second radio wave video camera") that form pairs with any two of the six radio wave video cameras 30 described above, into monochrome; and Figures 7 and 10 are explanatory diagrams showing an example of one frame of first and second composite video data obtained by combining the first and second visible light video data with the first and second radio wave video data, respectively.

[0060] When a space without a bug is imaged, the first radio wave video data and the first composite video data do not show any white-glowing areas, as shown in Figures 6 and 7. On the other hand, when a space with a bug is imaged, the second radio wave video data and the second composite video data show white-glowing areas, as shown in Figures 9 and 10, and the white-glowing areas in the second composite video are displayed on the display 52 surrounded by a frame.

[0061] According to the radio wave transmitter detection device 1 of Example 1 described above, six visible light video cameras 10 equipped with image sensors 14 sensitive to wavelengths of visible light components and six radio wave video cameras 30 positioned at approximately the same positions and angles as the six visible light video cameras 10 and equipped with image sensors 34 sensitive to wavelengths of radio waves emitted by bugs capture images of the target space. The visible light video data captured by the visible light video cameras 10 and monochrome radio wave video data obtained by converting the radio wave video data captured by the radio wave video cameras 30 to monochrome are then combined and output, thereby enabling reliable detection of the presence or absence of a bug and its location. Furthermore, because the target space is captured as video, even a bug that transmits radio waves at random times can be reliably detected as the presence or absence of a bug and its location. Furthermore, the use of six visible light video cameras 10 and six radio wave video cameras 30 allows simultaneous detection in all directions within the target space, thereby enabling bug detection in a short period of time. Furthermore, if a bug has been installed, a frame is displayed around the location of the bug on the composite video displayed on the display 52, making it easy to know where the bug is.

[0062] In the radio wave transmitter detection device 1 of Example 1, the imaging device 2 is configured to include a visible light video camera 10 and a radio wave video camera 30, but this 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 a radio wave digital camera instead of the radio wave video camera 30. When the imaging device 2 is configured to include a visible light digital camera and a radio 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 combine the monochrome image data with visible light image data captured by the visible light digital camera. If the monochrome video data includes a frame in which a bug is captured, the video composition unit 64 selects the monochrome image data in which the bug is captured and combines it with the visible light image data.

[0063] In the radio wave transmitter detection device 1 of the first embodiment, the imaging device 2 is configured to have six visible light video cameras 10 and six radio wave video cameras 30, but this is not limited to this. For example, the imaging device 2 may be configured to have only one set of visible light video cameras 10 and radio wave video cameras 30, or may be configured to have two to five, or seven or more visible light video cameras 10 and radio wave video cameras 30.

[0064] In the radio wave transmitter detection device 1 of the first embodiment, the radio wave transmitter detection device 1 includes a video converter 63 that converts the radio wave video data into monochrome radio wave video data, but the present invention is not limited to this. For example, the image processing engine 36 of the radio wave video camera 30 may convert the radio wave video data into monochrome radio wave video data.

[0065] Next, a radio wave transmitter detection device 100 according to a second embodiment will be described. As shown in FIG. 11 , the radio wave transmitter detection device 100 according to the second embodiment is configured as a device capable of detecting a radio wave transmitter (specifically, a bugging device) installed in a space to be detected, such as a room, and includes an image capture device 102 that captures images of the space to be detected and a PC 150 that is connected to the image capture device 102 by a wire. While the image capture device 102 and the PC 150 are connected by a wire in this embodiment, it goes without saying that the image capture device 102 and the PC 150 may be connected wirelessly. The radio wave transmitter detection device 100 according to the second embodiment differs from the radio wave transmitter detection device 1 according to the first embodiment in that the visible light video camera 10 and the radio wave video camera 30 are replaced with a video camera 110, and accordingly, the visible light video acquisition unit 61 and the radio wave video acquisition unit 62 are replaced with a video acquisition unit 161, and the video conversion unit 63 and the video synthesis unit 64 are eliminated. In order to avoid redundant explanations, the components of the radio wave transmitter detection device 100 according to Example 2 that correspond to the components of the radio wave transmitter detection device 1 according to Example 1 will be given the same symbols, and detailed explanations thereof will be omitted.

[0066] 12, the video camera 110 of Example 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, a video output terminal 118 electrically connected to the image processing engine 116, a recording medium 120, and an audio receiving unit 122, and a camera body 124 housing these components. The filter 113 is configured with a pattern of visible light-transmitting material (e.g., red, green, and blue color resist) that can transmit visible light wavelengths, specifically, wavelengths in the 360-700 nm range, and a radio wave-transmitting material that can transmit radio wave wavelengths emitted by a bugging device, specifically, wavelengths in the 145-430 MHz range. The image sensor 114 has light receiving sensitivity to both the visible light wavelengths, specifically, the 360-700 nm range, and the radio wave wavelengths emitted by the bugging device, specifically, the 145-430 MHz range. This allows the camera to capture images (video) of the space being detected, and also capture images by receiving radio waves emitted by the bug. As a result, the location of the bug can be detected. The image processing engine 116 converts the video data generated by the image sensor 114 into a file that can be viewed as a video. The image processing engine 116 also outputs the converted image or video to the PC 150 via the video output terminal 118 and to the recording medium 120. The video output terminal 118 and the PC 150 are connected by a cable 82 via an adapter 80 (see FIG. 11 ). The video camera 110 corresponds to the "camera" of the present invention, and the image sensor 114 is an example of an embodiment that corresponds to the "imaging element" of the present invention.

[0067] The PC 150 of Example 2 is configured as a microprocessor centered around a CPU (not shown), and includes a ROM (not shown) for storing various processing programs, a RAM (not shown) for temporarily storing data, a GPU (not shown) for performing calculations and matrix operations required for image processing, a hard disk (HDD) (not shown) which is a large-capacity memory for storing various application programs (simply referred to as applications) including the radio wave transmitter detection program according to the present invention, and various data including image data and video data, and an input / output interface (I / F) (not shown) for inputting and outputting data to and from external devices. The PC 150 also includes input devices (not shown), such as a keyboard and a mouse, through which a user inputs various commands, and a display 52 for displaying 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 exchange various control signals and data with each other. In the PC 150, the above-mentioned 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, work in cooperation with one or both of them to form functional blocks, such as a video acquisition unit 161, a location identification unit 65, a storage unit 66, an output unit 67, and a display unit 68, as shown in Fig. 13. In other words, it can be said that the functions of these units (the video acquisition unit 161, the location identification unit 65, the storage unit 66, the output unit 67, and the display unit 68) are realized by the individual or cooperative operation of each component (the CPU, ROM, RAM, GPU, HDD, I / F, input device, display 52, etc.) in response to instructions from the CPU that executes an application deployed from the HDD to the RAM. 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.

[0068] 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, storage unit 66, output unit 67, etc. in a manner that makes it possible to identify which of the six video cameras 110 captured the video data. The video data is an example of an embodiment corresponding to "image" in the present invention.

[0069] The location determination unit 65 uses the video data from the video acquisition unit 161 to determine whether the video data includes a frame in which a bug is captured, and if a frame in which a bug is captured is found, it determines the location of the bug in that frame. Specifically, the location determination unit 65 determines through image processing whether each frame of the video data contains a white-lighted area, and if a white-lighted area is found, it identifies the white-lighted area as the location of the bug. The location determination unit 65 then supplies the identified location of the bug to the display unit 68.

[0070] The storage unit 66 stores the video data in a manner that makes it possible to identify which of the six video cameras 110 captured the video data.

[0071] The output unit 67 outputs the video data to the display unit 68 in a manner that makes it possible to identify which of the six video cameras 110 captured the video data.

[0072] The display unit 68 displays the video data from the output unit 67 on the display 52 in a manner that makes it possible to identify which of the six video cameras 110 captured the video. Furthermore, if the video data contains a frame containing a bug, the display unit 68 displays the location of the bug identified by the location identification unit 65 in a manner that allows visual confirmation. In this embodiment, the location of the bug is displayed by enclosing it in a frame (see FIG. 10 ).

[0073] Next, the operation of the radio wave transmitter detection device 100 configured as described above, particularly the operation when detecting a bug, will be described. To detect a bug, the radio wave transmitter detection device 100 is first installed in the space to be detected, such as a room where a bug is suspected. Once the radio wave transmitter detection device 100 has been installed in the space to be detected, the imaging device 102 is started and the PC 150 is operated to execute the radio wave transmitter detection program of the present invention. This causes the CPU to read the radio wave transmitter detection program of the present invention stored in memory including the ROM, and processes information according to the steps instructed by the program, thereby executing the radio wave transmitter detection method of the present invention.

[0074] When the radio wave transmitter detection program is executed, the video acquisition unit 161 first executes a process of acquiring video data from each of the six video cameras 110, and the location determination unit 65 executes a process of using the video data to determine whether the video data contains a frame in which a bug is captured. The determination of whether a frame in which a bug is captured is made by the location determination unit 65 performing image processing on each video data to determine whether each frame of the video data contains a white light. If it is determined that any of the video data contains a frame in which a bug is captured, the location of the bug is identified in that frame. Specifically, the white light in that frame is identified as the location of the bug. The location determination unit 65 then provides the identified location of the bug to the display unit 68.

[0075] Finally, the display unit 68 executes a process of displaying each piece of video data on the display 52. ​​At this time, if any of the monochrome radio wave video data constituting each piece of video data includes a frame in which a bugging device is captured, the display unit 68 displays the location of the bugging device by enclosing it in a frame on the corresponding video data.

[0076] The radio wave transmitter detection device 100 according to the second embodiment described above also has the same effects as those of the radio wave transmitter detection device 1 according to the first embodiment, specifically, the effect of being able to reliably detect whether or not a bug is installed and its location, even if the bug transmits radio waves at random timing, the effect of being able to simultaneously detect all directions in the space to be detected, the effect of being able to detect the bug in a short time, the effect of being able to easily know the location of the bug, etc. Furthermore, according to the radio wave transmitter detection device 100 according to the second embodiment, only one video camera 110 is disposed on each side of the housing 4, which reduces the number of parts.

[0077] In the radio wave transmitter detection device 1, 100 of Examples 1 and 2, the radio wave transmitter detection device 1, 100 is configured to include an image capture device 2, 102 and a PC 50, 150, but this is not limited to this. The radio wave transmitter detection device 1, 100 may be configured such that the image capture device 2, 102 has the functions of the PC 50, 150. In other words, instead of the radio wave transmitter detection device 1, 100 being configured to include the image capture device 2, 102 and the PC 50, 150 separately, the image capture device 2, 102 and the PC 50, 150 may be configured as a dedicated device in which they are integrated.

[0078] This embodiment shows an example of a mode for carrying out the present invention. Therefore, the present invention is not limited to the configuration of this embodiment. The correspondence between each component of this embodiment and each component of the present invention is shown below.

[0079] REFERENCE SIGNS LIST 1 Radio wave transmitter detection device (radio wave transmitter detection device) 2 Image capture device 4 Housing (housing) 6 Support leg 10 Visible light video camera (first camera) 12 Lens 13 Color filter 14 Image sensor (first image capture element) 16 Image processing engine 18 Video output terminal 20 Recording medium 22 Audio receiving unit 24 LCD monitor 26 Viewfinder 28 Camera body 30 Radio wave video camera (second camera) 32 Lens 34 Image sensor (second image capture element) 36 Image processing engine 38 Video output terminal 44 Camera body 46 Bandpass filter 50 PC 52 Display 61 Visible light video acquisition unit 62 Radio 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 Memory unit 67 Output unit (output unit) 68 Display unit (display unit) 80 Adapter 82 Cable 100 Radio wave transmitter detection device (radio wave transmitter detection device) 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 media 122 Audio receiving unit 124 Camera body 161 Video acquisition unit

Claims

1. A radio wave transmitter detection device for detecting radio wave transmitters comprising: a housing; at least one first camera disposed on the housing and equipped with a first imaging element having a light receiving sensitivity to wavelengths of visible light components; at least one second camera disposed on the housing and equipped with a second imaging element having a light receiving sensitivity to the wavelengths of electromagnetic waves emitted by the radio wave transmitter and disposed in a position and angle substantially equal to that 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 synthetic image by synthesizing the first image captured by the first camera and the third image; and an output unit capable of outputting the synthetic image generated by the image synthesis unit.

2. The radio transmitter detection device according to claim 1, wherein at least the second image is a video.

3. A radio wave transmitter detection device as described in claim 2, further comprising a frame identification unit capable of identifying a frame in which the radio wave transmitter is presumed to have been captured from the second image, wherein the image conversion unit generates the third image by converting the frame to monochrome.

4. A radio transmitter detection device as described in any one of claims 1 to 3, wherein the housing is a polyhedron having multiple faces, and the first and second cameras are arranged on each of the multiple faces.

5. A radio wave transmitter detection device as described in any one of claims 1 to 3, further comprising: a display unit capable of displaying the composite image; and a location determination unit that determines the location of the radio wave transmitter based on the third image, wherein the display unit notifies the location of the radio wave transmitter determined by the location determination unit in a manner that allows the location to be visually confirmed.

6. A radio wave transmitter detection device as described in claim 4, further comprising: a display unit capable of displaying the composite image; and a location determination unit that determines the location of the radio wave transmitter based on the third image, wherein the display unit notifies the location of the radio wave transmitter determined by the location determination unit in a manner that allows the location to be visually confirmed.

7. A radio wave transmitter detection device for detecting a radio wave transmitter, comprising: a filter in which visible light transparent material capable of transmitting the wavelengths of visible light components and radio wave transparent material capable of transmitting the wavelengths of electromagnetic waves emitted by said radio wave transmitter are arranged in a pattern; at least one camera having an image sensor having a light receiving sensitivity equal to or higher than the wavelengths of visible light components; and an output unit capable of outputting an image captured by said camera. The radio wave transmitter detection device according to claim 7, wherein said image is a video.

8. The radio transmitter detection device according to claim 7, wherein the image is a video.

9. A radio wave transmitter detection device as described in claim 7 or 8, further comprising a housing capable of supporting the camera, the housing being a polyhedron having a plurality of faces, and the camera being disposed on each of the plurality of faces.

10. A radio wave transmitter detection device as described in claim 7 or 8, further comprising: a display unit capable of displaying the image; and a location determination unit that determines the location of the radio wave transmitter based on the image, wherein the display unit notifies the location of the radio wave transmitter determined by the location determination unit in a manner that allows the location to be visually confirmed.

11. A radio wave transmitter detection device as described in claim 9, further comprising: a display unit capable of displaying the image; and a location determination unit that determines the location of the radio wave transmitter based on the image, wherein the display unit notifies the location of the radio wave transmitter determined by the location determination unit in a manner that allows the location to be visually confirmed.

12. A method for detecting radio wave transmitters, comprising the steps of: (a) arranging at least one first camera having a first imaging element having sensitivity to wavelengths of visible light components, and at least one second camera having a second imaging element having sensitivity to the wavelengths of electromagnetic waves emitted by the radio wave transmitter, so that the camera positions and angles are approximately equal; (b) capturing images of the space to be detected using the first and second cameras; (c) converting the second image captured by the second camera into a monochrome third image; (d) generating a composite image by combining the first image captured by the first camera and the third image; and (e) outputting the generated composite image.

13. The method for detecting a radio wave transmitter according to claim 12, wherein said step (b) includes a step of capturing at least said second image as a video.

14. A radio wave transmitter detection program for detecting a radio wave transmitter, the program causing a computer to execute at least steps (b) to (e) of the radio wave transmitter detection method according to claim 12 or 13.

15. A method for detecting radio wave transmitters, comprising: (f) a step of capturing an image of the space to be detected using at least one camera equipped with a filter in which visible light transparent material capable of transmitting the wavelengths of visible light components and radio wave transparent material capable of transmitting the wavelengths of electromagnetic waves emitted by the radio wave transmitter are arranged in a pattern, and an imaging element having a light receiving sensitivity equal to or higher than the wavelengths of visible light components; and (g) a step of outputting the image of the space to be detected captured by the camera.

16. The method for detecting a radio wave transmitter according to claim 15, wherein step (f) includes at least a step of capturing the image as a video.

17. A radio wave transmitter detection program for detecting a radio wave transmitter, the radio wave transmitter detection program causing a computer to execute the radio wave transmitter detection method according to claim 15 or 16.

Images