Imaging device, analysis-image generation system, and non-pressurization panel

Abstract

Provided are: at least one imaging device disposed on an inner surface side of a non-pressurization panel which is attached to a non-pressurized region of a body of a pressurized aircraft; an analysis-image generation system including the imaging device; and a non-pressurization panel that is attached to a non-pressurized region of a body of an aircraft.

Description

Imaging Device, Analysis Image Generation System, and Non-Pressurized Panel

[0001] The present invention relates to an imaging device for imaging from above, a system for generating an analysis image for analyzing the state of an area imaged from above, and a panel attached to an aircraft for this system.

[0002] In recent years, systems have been proposed for imaging the ground surface or sea surface from above and analyzing the state of the imaged area. Among them, a system for calculating the volume of trees based on an image of a forest imaged from above has been proposed (see, for example, Patent Document 1). By continuously using the system described in Patent Document 1, it is possible to accurately grasp the transition of the growth state of trees in a forest.

[0003] Japanese Patent Application Laid-Open No. 2003-344048

[0004] To image the ground surface or sea surface from above, it is conceivable to use an imaging device mounted on an artificial satellite, an aircraft, a drone, etc. When imaging from an artificial satellite, it is suitable for continuously imaging a predetermined area, but the image resolution is low and it is easily affected by clouds, etc., so it is difficult to obtain an image suitable for analysis.

[0005] On the other hand, when imaging from an aircraft or a drone, since the flight altitude is low, an image with a high resolution suitable for analysis can be obtained. However, since it takes a large cost and effort every time of flight, it is difficult to continuously image a predetermined area.

[0006] Therefore, an object of the present invention is to solve the above problems, and to provide an imaging device that can continuously image from above without requiring a large cost and effort, a system for generating an analysis image suitable for analyzing the imaged area, and a panel attached to an aircraft for this system.

[0007] To achieve the above objective, one aspect of the present invention is at least one imaging device positioned on the inner surface of an unpressurized panel attached to an unpressurized region of the fuselage of a pressurized aircraft. Another aspect of the present invention is an analytical image generation system comprising: at least one imaging device positioned on the inner surface of an unpressurized panel attached to an unpressurized region on the lower side of the fuselage of an aircraft; and an image generation unit that generates an analytical image for analyzing the state of an area to be analyzed based on an image acquired by the imaging device, wherein the aircraft periodically flies a predetermined route, and during the flight of the aircraft, the imaging device images the lower region of the fuselage through a window formed in the unpressurized panel, and at least one of the imaging devices includes an imaging device positioned such that the optical axis of the lens is oriented substantially vertically when the aircraft is in horizontal flight.

[0008] A further aspect of the present invention is an unpressurized panel comprising: a panel body that is detachably attached to an unpressurized area on the underside of the fuselage of an aircraft; and at least one imaging device disposed on the inner surface of the panel body, wherein a window is formed in the panel body, and the imaging device images the area on the underside of the fuselage through the window when the aircraft is in flight; and at least one of the imaging devices includes an imaging device that is positioned such that the optical axis of the lens is oriented substantially vertically when the aircraft is in level flight; and an analytical image for analyzing the state of the area to be analyzed is generated based on the image acquired by the imaging device.

[0009] According to this embodiment, it is possible to provide an imaging device that can continuously capture images from above without requiring significant cost or effort, a system that generates analytical images suitable for analyzing the captured area, and a panel that can be attached to an aircraft for this system.

[0010] This is a schematic perspective view showing an example of an aircraft fitted with an unpressurized panel according to one embodiment of the present invention. This is a schematic perspective view showing an unpressurized panel according to one embodiment of the present invention. This is a schematic side cross-sectional view showing section A-A in Figure 2, where an imaging device is arranged so that the optical axis of the lens is oriented substantially vertically, and an imaging device is arranged so that the optical axis of the lens is oriented in a direction intersecting the vertical. This is a schematic side cross-sectional view showing section A-A in Figure 2, where a plurality of imaging devices are arranged side by side so that the optical axes of the lenses are oriented substantially vertically. This is a plan view of the fuselage of an aircraft viewed from below, showing the line B-B in Figures 3A and 3B. This is a block diagram showing the system configuration of an analytical image generation system according to one embodiment of the present invention.

[0011] Hereinafter, embodiments for carrying out the invention described herein will be explained with reference to the drawings. The embodiments described below are intended to embody the technical concept of the invention described herein, and unless otherwise specified, the invention described herein is not limited to the embodiments described below.

[0012] In each drawing, components having the same function may be denoted by the same reference numeral. Partial substitution or combination of configurations shown in different embodiments is possible. In the embodiments described later, descriptions of matters common to those described earlier will be omitted, and only the differences will be explained. In particular, similar effects and benefits from similar configurations will not be mentioned sequentially for each embodiment. The size and positional relationships of components shown in each drawing may be exaggerated to clarify the explanation.

[0013] The following description indicates the forward / backward, left / right, and up / down directions from the perspective of the pilot or passenger of an aircraft in level flight. These directions are indicated by arrows in Figures 1 through 4.

[0014] (Unpressurized Panel According to One Embodiment of the Invention) First, an overview of the unpressurized panel according to one embodiment of the Invention will be described with reference to Figures 1 and 2. Figure 1 is a schematic perspective view showing an example of an aircraft to which an unpressurized panel according to one embodiment of the Invention is attached. Figure 2 is a schematic perspective view showing an unpressurized panel according to one embodiment of the Invention. Figure 2 is a view from the inside of an unpressurized area 110 of the fuselage 102 of an aircraft 100 to which an unpressurized panel is attached, showing the unpressurized panel 2, which opens and closes with a hinge member 8, in a slightly open state.

[0015] The unpressurized panel 2 according to this embodiment comprises a panel body 4. The panel body 4 is attached to an unpressurized area 110 on the underside of the fuselage 102 of the aircraft 100. In Figure 1, the aircraft 100 is shown as a propeller aircraft. However, the aircraft 100 is not limited to a propeller aircraft; it could also be a jet aircraft.

[0016] The aircraft 100 to which the unpressurized panel 2 is attached is preferably an aircraft that regularly flies a predetermined flight route. Aircraft that regularly flies a predetermined flight route include civilian passenger planes, cargo planes, and sightseeing planes. Furthermore, it includes any other aircraft, including those of the Japan Self-Defense Forces, the Japan Coast Guard, the police, and local governments.

[0017] The unpressurized panel 2 is a panel attached to an unpressurized area 110, which is isolated from areas that are pressurized during flight, such as the passenger cabin and the cargo hold. The unpressurized area 110 can be, for example, an area that narrows as it approaches the rear end of the lower side of the aircraft 100. The position where the unpressurized panel 2 according to this embodiment is attached may be directly below the fuselage of the aircraft 100, or it may be at an angle below.

[0018] The panel body 4 can be formed from a thin metal sheet. The metal material used should preferably be lightweight, have high strength, and excellent corrosion resistance. Any aluminum alloy, including duralumin, or any stainless steel alloy can be used.

[0019] In this embodiment, a hinge member 8 attached to the panel body 4 is attached to an opening in the unpressurized region 110 of the fuselage 102, and the panel body 4 is attached to the fuselage 102 in a manner that allows it to be opened and closed. The panel body 4 is equipped with a locking mechanism when closed. The locking mechanism ensures that the panel body 4 is securely closed and maintained during flight of the aircraft 100, enabling safe flight. When the aircraft 100 is waiting at an airport or the like, the lock can be released and the panel body 4 can be opened to access the inner surface of the panel body 4 and the interior of the unpressurized region 110 of the fuselage 102.

[0020] The hinge member 8 can be removed from the fuselage of the aircraft 100. In other words, the panel body 4 is attached to the unpressurized area 110 of the fuselage 102 in a detachable manner. It is also possible that the panel body 4 does not have the hinge member 8, and is attached to the unpressurized area 110 of the fuselage 102 in a detachable manner by fastening members or the like. In any case, the panel body 4 can be attached to any aircraft as long as the shape of the opening in the unpressurized area is similar.

[0021] Three imaging devices 10A, 10B1, and 10B2 are mounted on the inner surface 4A of the panel body 4. The three imaging devices 10A, 10B1, and 10B2 are composed of imaging devices of the same type. However, this is not limited to this, and at least some of the imaging devices 10A, 10B1, and 10B2 may be of different types. Furthermore, a cooling fan 20 for cooling these three imaging devices 10A, 10B1, and 10B2 is mounted on the inner surface 4A of the panel body 4. In addition, guide plates 22 are positioned on both sides of the outlet of the cooling fan 20. These guide plates 22 allow one cooling fan 20 to effectively cool the three imaging devices 10A, 10B1, and 10B2. However, this is not limited to this, and for example, each imaging device 10A, 10B1, and 10B2 may have its own cooling fan.

[0022] Furthermore, a battery 30 is also attached to the inner surface 4A of the panel body 4 to supply power to the imaging devices 10A, 10B1, and 10B2, as well as the cooling fan 20. This allows imaging to be performed independently by the imaging devices 10A, 10B1, and 10B2 using only the components provided in the unpressurized panel 2, without requiring power supply from the aircraft 100 or an external source. In other words, the unpressurized panel 2 has a self-contained configuration.

[0023] <Arrangement of Imaging Devices> Next, the arrangement of imaging devices 10A, 10B1, and 10B2 provided on the non-pressurized panel 2 will be described in more detail with reference to Figures 3A, 3B, and 4. Figure 3A is a schematic side cross-sectional view showing the section A-A of Figure 2, and shows the case in which an imaging device is arranged so that the optical axis of the lens is oriented in a substantially vertical direction and an imaging device is arranged so that the optical axis of the lens is oriented in a direction intersecting the vertical direction. Figure 3B is a schematic side cross-sectional view showing the section A-A of Figure 2, and shows the case in which a plurality of imaging devices are arranged in a line so that the optical axis of the lens is oriented in a substantially vertical direction. Figure 4 is a plan view of the aircraft fuselage seen from below, showing the line B-B in Figures 3A and 3B.

[0024] On the inner surface 4A of the panel body 4, imaging devices 10A, 10B1, and 10B2 are arranged adjacent to each other. More specifically, in the example shown in Figure 3A, the first imaging device 10A, located in the center in the left-right direction, which is the width direction of the aircraft 100, is positioned such that the optical axis of the lens 12 points in a substantially vertical direction when the aircraft 100 is in horizontal flight. Here, "left-right direction" means a direction substantially perpendicular to the direction of travel of the aircraft 100 on a substantially horizontal plane when the aircraft 100 is in horizontal flight. On the other hand, the optical axes of the lenses 12 of the second imaging devices 10B1 and 10B2, located on the left and right sides of the central first imaging device 10A, are positioned so that they point in a direction intersecting the vertical direction. In other words, the imaging device in which the optical axis of the lens 12 points in a substantially vertical direction is designated as "first," and the imaging device in which the optical axis of the lens 12 points in a direction intersecting the vertical direction is designated as "second." On the other hand, in the example shown in Figure 3B, when the aircraft 100 is in level flight, three first imaging devices 10A are arranged side by side so that the optical axis of the lens 12 is oriented in a substantially vertical direction.

[0025] A panel body 4 located on the underside of the fuselage 102 of the aircraft 100 has windows 6 corresponding to the imaging devices 10A, 10B1, and 10B2. The windows 6 are made of a transparent or light-transmitting flat plate material, such as acrylic or other resin materials, or glass materials. Furthermore, an anti-reflective coating can be applied to the surface. Through these flat windows 6, the imaging devices 10A, 10B1, and 10B2 can image the area under the fuselage 102. As a result, the imaging devices 10A, 10B1, and 10B2 can image the sea, land, rivers, lakes, ponds, etc. under the aircraft 100 in flight and acquire images of the area to be analyzed.

[0026] Since the panel body 4, which is attached to the non-pressurized region 110, experiences a smaller differential pressure compared to when the panel is attached to a pressurized region, the thickness of the metal plates that make up the panel can be reduced, resulting in a lighter panel body 4. Furthermore, since the thickness of the window 6 can be reduced, the effects of refractive index can be reduced, and the imaging devices 10A, 10B1, and 10B2 can obtain clear images that accurately capture the region under analysis.

[0027] To achieve a compact arrangement with imaging devices 10A, 10B1, and 10B2 in close proximity, it is advantageous to have a single window that accommodates all three imaging devices 10A, 10B1, and 10B2. However, considering the strength of the window 6 required to guarantee safe flight, the required thickness of the window becomes very large. Therefore, it becomes difficult to acquire an image that accurately captures the area to be analyzed due to the significant influence of refractive index. For this reason, in this embodiment, three windows 6 corresponding to each of the individual imaging devices 10A, 10B1, and 10B2 are formed. A window frame portion made of a metal panel body 4 exists between the adjacent windows 6, so sufficient strength can be obtained.

[0028] In particular, since the panel body 4 is attached to the unpressurized region 110 of the conductor 102, the differential pressure on the windows 6 and the window frames between them is small. Therefore, the width of the window frames can be narrowed, and the distance between adjacent windows 6 can be reduced. This allows the three imaging devices 10A, 10B1, and 10B2 to be placed closer together. Since multiple imaging devices 10A, 10B1, and 10B2 can be placed close together, the panel body 4 can be miniaturized.

[0029] As shown in Figures 3A and 3B, in this embodiment, the imaging devices 10A, 10B1, and 10B2 are mounted on the inner surface of the panel body 4 via a spacer 14. As a result, the lenses 12 of the imaging devices 10A, 10B1, and 10B2 are positioned to face the inner surface of the window 6. The optical axes of the lenses 12 of the imaging devices 10A, 10B1, and 10B2 are positioned to be approximately perpendicular to the inner and outer surfaces of the window 6.

[0030] In the example shown in Figure 3A, the optical axes of the lenses 12 of each imaging device 10A, 10B1, and 10B2 are oriented differently, and the flat windows 6, each having a light-receiving surface perpendicular to the optical axis of the respective lens 12, are arranged in different orientations. This allows the imaging devices 10A, 10B1, and 10B2 to image a wide area on the underside of the torso 102 through the windows 6. On the other hand, in the example shown in Figure 3B, the optical axes of the lenses 12 of each imaging device 10 are oriented the same, and the flat windows 6, each having a light-receiving surface perpendicular to the optical axis of the respective lens 12, are also arranged in the same orientation. However, the mounting structure of the imaging device is not limited to the above using spacers 14. Any other mounting structure can be adopted as long as the imaging device can appropriately image the area on the underside of the torso through the windows.

[0031] To describe in more detail the arrangement of the imaging devices 10A, 10B1, and 10B2 in the example shown in Figure 3A, the optical axes of the lenses 12 of the second imaging devices 10B1 and 10B2, which are positioned on either side of the first imaging device 10A, are oriented in a direction that moves away from the optical axis of the lens 12 of the first imaging device 10A as they move downwards. In other words, the second imaging devices 10B1 and 10B2 are arranged such that the optical axes of their lenses 12 spread out from each other as they move downwards.

[0032] As shown in Figure 3A, if θ is the angle at which the optical axes of the lenses 12 of the second imaging devices 10B1 and 10B2 intersect with the vertical direction, then any angle less than 90 degrees can be used as the value of θ. By setting the value of θ to less than 90 degrees, the area under the fuselage 102 of the aircraft 100 can be reliably imaged. A larger value of θ allows for imaging of a wider area. On the other hand, from the viewpoint of reducing the effect of backlighting and reducing image correction, an angle of θ of 60 degrees or less is preferable, an angle of 45 degrees or less is more preferable, and an angle of 30 degrees or less is even more preferable. As will be described later, when acquiring images of adjacent areas that partially overlap using each of the imaging devices 10A, 10B1, and 10B2, any angle θ can be set based on the field of view of the lens 12 and the desired degree of overlap.

[0033] Furthermore, in the example shown in Figure 3B, when the aircraft 100 is in level flight, three first imaging devices 10A are arranged side by side so that the optical axis of the lens 12 is oriented approximately vertically, and the value of θ is 0 degrees. In summary, in this embodiment, any angle within the range of 0 degrees to less than 90 degrees can be used as the value of θ.

[0034] The imaging devices 10A, 10B1, and 10B2 according to this embodiment employ so-called multispectral cameras that can acquire images of four different wavelengths with a single imaging device. Therefore, as shown in Figure 3A, a single imaging device 10A, 10B1, and 10B2 is equipped with four lenses 12 corresponding to different wavelengths. The window 6 is large enough to image the area below the body 102 without interfering with the window frame for all lenses 12. The planar shape of the window 6 can be any shape corresponding to the arrangement of the four lenses 12.

[0035] Furthermore, the number of wavelengths at which an image can be acquired with a single imaging device is not limited to four; a multispectral camera capable of acquiring images at any number of other different wavelengths can be employed. It is also possible to employ imaging devices that acquire images at only one wavelength. Moreover, when using multiple imaging devices, it is possible to combine imaging devices that can acquire images at different wavelengths.

[0036] The imaging devices 10A, 10B1, and 10B2 are equipped with sunlight sensors and adjust to the optimal aperture and shutter speed according to the intensity of sunlight during imaging, ensuring that a clear image of the area being analyzed is always obtained.

[0037] (An analytical image generation system according to one embodiment of the present invention) Next, an analytical image generation system equipped with the above-described non-pressurized panel will be described with reference to Figure 5. Figure 5 is a block diagram showing the system configuration of an analytical image generation system according to one embodiment of the present invention.

[0038] The analytical image generation system 50 according to this embodiment includes imaging devices 10A, 10B1, and 10B2 attached to the non-pressurized panel 2 as described above, and an image generation unit 40 that generates analytical images for analyzing the state of the region to be analyzed based on images acquired by imaging devices 10A, 10B1, and 10B2. Furthermore, information such as position data acquired by the aircraft 100 is supplied to the system 50 and stored in association with the image data acquired by imaging devices 10A, 10B1, and 10B2.

[0039] The image generation unit 40 may include control units provided by the imaging devices 10A, 10B1, and 10B2 themselves, or it may include a calculation and processing unit mounted on the non-pressurized panel 2 together with the imaging devices 10A, 10B1, and 10B2, or it may include a calculation and processing unit located at a remote location.

[0040] Considering the various standards for the safe flight of aircraft 100, transmitting data during flight and at the airport is fundamentally difficult. Therefore, after aircraft 100 lands, it is conceivable to access the inner surface 4A of the unpressurized panel 2 and import image data acquired by imaging devices 10A, 10B1, and 10B2 into system 50 using storage means such as a memory card or hard disk. Information such as position data acquired by aircraft 100 can also be similarly imported into system 50. Based on the imaging time, image data captured by imaging devices 10A, 10B1, and 10B2 can be reliably correlated with position data acquired by aircraft 100.

[0041] However, if the criteria are met, images captured by the imaging devices 10A, 10B1, and 10B2, as well as position data from the aircraft 100, can be sequentially transmitted via wireless communication to the remotely located image generation unit 40. Also, if the criteria are met, images captured by the imaging devices 10A, 10B1, and 10B2, as well as position data from the aircraft 100, can be transmitted via wireless or wired communication to the remotely located image generation unit 40 while the aircraft 100 is waiting on the ground.

[0042] <Image Generation Unit> The image generation unit 40 generates an analysis image for analyzing the state of the imaged analysis region based on the images captured by the imaging devices 10A, 10B1, and 10B2. In recent years, the changes in natural phenomena have been remarkable, disasters have occurred frequently, and artificial environmental destruction such as the dumping of plastic waste into the ocean has also been progressing. By continuously acquiring images of the analysis region from above and generating and analyzing analysis images, the state of natural phenomena and environmental destruction in the analysis region can be grasped quickly and accurately.

[0043] In particular, when the non-pressure panel 2 is attached to an aircraft 100 that flies regularly along a predetermined route, it is possible to easily realize fixed-point observation of the analysis region. Therefore, continuous imaging from above can be performed without requiring a large cost or effort, and an analysis image suitable for analyzing the imaged region can be generated.

[0044] Further, since the non-pressure panel 2 is detachable, it can be attached to any aircraft as long as the panel has the same shape, and one non-pressure panel 2 can be used for various aircraft, contributing to the analysis of various natural phenomena and artificial phenomena in various regions.

[0045] The imaging devices 10A, 10B1, and 10B2 are equipped with a clock and GPS and can record the imaging time and imaging position. However, since there is a certain degree of error in the position detected by the GPS provided in the imaging devices 10A, 10B1, and 10B2, it cannot be said that it is suitable for analyzing the state of the analysis region.

[0046] Therefore, in the analysis image generation system 50 according to the present embodiment, the image generation unit 40 associates the longitude and latitude data, altitude data, and inclination data of the aircraft 100 at the time of imaging with the images acquired by the imaging devices 10A, 10B1, and 10B2 using the imaging time recorded in the imaging devices 10A, 10B1, and 10B2.

[0047] Using the imaging time, accurate position data (longitude, latitude, altitude, and tilt data) based on flight data can be associated with the images of the analyzed regions captured by the imaging devices 10A, 10B1, and 10B2. In addition to the accurate planar positions of the imaging devices 10A, 10B1, and 10B2 at the time of imaging based on the longitude and latitude data, the height positions of the imaging devices 10A, 10B1, and 10B2 and the tilt of the lens 12 are also associated, so that the position of the captured analyzed region can be accurately specified. Therefore, accurate analysis of the analyzed region can be expected.

[0048] <Continuous Image> Further, in the analysis image generation system 50 according to the present embodiment, each of the imaging devices 10A, 10B1, and 10B2 is arranged to acquire images of adjacent regions that partially overlap. Then, the image generation unit 40 generates a continuous image by connecting the respective images.

[0049] By generating a continuous image by connecting the respective images captured by the three imaging devices 10A, 10B1, and 10B2, an image with high resolution of a wide area can be obtained. Therefore, analysis of a wider analyzed region can be realized.

[0050] At this time, as described above, the non-pressure panel 2 includes the first imaging device 10A arranged such that the optical axis of the lens 12 faces the substantially vertical direction when the aircraft is flying horizontally, and the second imaging devices 10B1 and 10B2 arranged such that the optical axes of the lenses 12 face a direction intersecting the vertical direction.

[0051] When the optical axis of the lens of the imaging device is obliquely directed with respect to the subject, correction of the image acquired by the imaging device becomes necessary. If the image contains an object whose shape is previously known, correction can be performed based on the shape of the object. However, for example, when acquiring an image of the ocean, it is difficult to perform appropriate correction because there is no object serving as a correction reference in the image.

[0052] However, the image acquired by the first imaging device 10A, which is positioned so that the optical axis of the lens 12 is oriented approximately vertically during horizontal flight, is an image of the region to be analyzed viewed from a vertical direction, and thus serves as a reference image that does not require correction. Therefore, since a reference image that does not require correction is obtained by the first imaging device 10A, an accurate analytical image that accurately captures the region to be analyzed can be obtained.

[0053] In particular, when acquiring images of adjacent regions that partially overlap using the first imaging device 10A and the second imaging devices 10B1 and 10B2, and generating a continuous image by connecting the acquired images, the images from the second imaging devices 10B1 and 10B2, whose optical axes of the lenses 12 are positioned diagonally, can be appropriately corrected based on the reference image from the first imaging device 10A in the overlapping portion, thereby obtaining an accurate image for analysis.

[0054] In this embodiment, three imaging devices 10A, 10B1, and 10B2 are arranged side by side in the left-right direction, which is a horizontal plane substantially perpendicular to the direction of travel of the aircraft 100 in horizontal flight. The first imaging device 10A is positioned in the center, and the second imaging devices 10B1 and 10B2 are positioned on either side of the first imaging device 10A. The optical axes of the lenses 12 of the second imaging devices 10B1 and 10B2 positioned on either side are oriented in a direction that moves away from the optical axis of the lens 12 of the first imaging device 10A as they move downwards.

[0055] Since the images from the second imaging devices 10B1 and 10B2, which are adjacent to the first imaging device 10A on both sides, overlap with the reference image from the central first imaging device 10A, proper correction is possible, and a continuous image of a desired wide area that accurately represents the area to be analyzed can be obtained.

[0056] In this embodiment, the angles θ of the second imaging devices 10B1 and 10B2, which are positioned on both sides of the first imaging device 10A, are the same; however, the angles θ of the second imaging devices 10B1 and 10B2 on both sides may be different. If the angle θ of the optical axis of the lenses 12 of the second imaging devices 10B1 and 10B2 intersects the vertical direction is within the above-mentioned angle range, the image will be less susceptible to adverse effects from direct sunlight such as backlighting, and a clear image will always be obtained. Even if the aircraft is ascending, descending, or turning, the tilt of the optical axis of the lens will be within a predetermined range, and it is considered that the image will be less susceptible to adverse effects from direct sunlight such as backlighting.

[0057] <Wavelengths at which the imaging device acquires images> In this embodiment, as described above, the imaging devices 10A, 10B1, and 10B2 can acquire images of four different wavelengths. In other words, instead of acquiring images of white light with a broad wavelength band, they acquire images of specific wavelengths. It is preferable that such specific wavelengths include wavelengths at which the state of absorption, reflection, or excitation by sunlight changes at a level that can be identified depending on whether or not a predetermined phenomenon occurs in the region under analysis. Examples of such specific wavelengths are given below.

[0058] For example, when sunlight strikes chlorophyll, which performs photosynthesis, there are wavelengths of light (e.g., red light, blue light, green light) that are absorbed, reflected, or excited by sunlight. If a predetermined phenomenon occurring in the region under analysis is an increase or decrease in the amount of chlorophyll in plants present in that region, then by including these wavelengths of light as specific wavelengths, it is possible to identify the increase or decrease in chlorophyll in the plants present in the region under analysis. This allows for the analysis of the growth state of plants in the region under analysis.

[0059] Furthermore, when sunlight strikes phytoplankton in water, certain wavelengths of light (e.g., red light) are absorbed, reflected, or excited by sunlight. Therefore, if a given phenomenon occurring in the region under analysis is the generation of phytoplankton in that region, the generation state of phytoplankton present in the region can be analyzed by including this exciting wavelength as a specific wavelength.

[0060] When various types of waste, including plastic waste, are dumped into oceans, rivers, lakes, etc., sunlight hitting the waste reveals wavelengths of light that are different from those absorbed or reflected when irradiated onto the water surface. Furthermore, sunlight also excites specific wavelengths of light that are triggered by sunlight hitting the waste. Therefore, if a given phenomenon occurring in the region under analysis is due to the presence of waste on the water surface or at shallow depths, including these specific wavelengths allows for the analysis of the waste dumping conditions within that region.

[0061] The above is merely one example, and depending on whether or not a predetermined phenomenon occurs in the region being analyzed, the wavelength of light that causes a discernible change in the state of absorption, reflection, or excitation by sunlight is not limited to the above; there may be various other wavelengths of light.

[0062] As described above, by using a specific wavelength as the analytical image, and by using an image of that specific wavelength as the analytical image, it is possible to accurately analyze various natural or artificial phenomena in the region under analysis. This wavelength is chosen because it allows for the identification of the state of absorption, reflection, or excitation by sunlight depending on whether or not a predetermined phenomenon occurs in the region under analysis.

[0063] Furthermore, the image generation unit 40 can also generate an analysis image using the image data of the specific wavelength and other wavelengths different from the specific wavelength. For example, by comparing an image of a specific wavelength that changes when a predetermined phenomenon occurs with an image of other wavelengths that does not change even when the predetermined phenomenon occurs, the phenomenon occurring in the region under analysis can be identified more clearly.

[0064] Furthermore, when an image created by superimposing an image of a specific wavelength with images of other wavelengths is used as the analysis image, the area where the predetermined phenomenon occurs will have a different color (wavelength) than usual, making it possible to clearly identify the area where the predetermined phenomenon occurred. Also, when an image created by taking the difference between the image data of an image of a specific wavelength and the image data of other wavelengths is used as the analysis image, the areas where the predetermined phenomenon does not occur cancel each other out, making it possible to highlight only the area where the predetermined phenomenon occurred.

[0065] The image generation unit 40 generates an analysis image using image data of a specific wavelength and images of other wavelengths different from the specific wavelength, thereby providing an analysis image that can more clearly show a predetermined phenomenon occurring in the region to be analyzed.

[0066] Using the analytical images described above, the following are examples of the state of the region to be analyzed: - In the sea, rivers, or lakes, the state of red tide occurrence, the state of algae or aquatic plant growth, the distribution of aquatic organisms, the distribution of birds that fly over the water, and the distribution of waste; and - On land, the state of plant growth, the distribution of animals, and the distribution of waste.

[0067] When analyzing red tide conditions from images of oceans, rivers, or lakes, it is conceivable to generate analytical images using light at wavelengths absorbed, reflected, or excited by sunlight by phytoplankton that cause red tides. When analyzing the growth conditions of plants in forests or plains from images of forests or plains, it is conceivable to generate analytical images using light at wavelengths absorbed, reflected, or excited by sunlight by chlorophyll. When analyzing pollution conditions from images of oceans, rivers, or lakes, it is conceivable to generate analytical images using light at wavelengths absorbed, reflected, or excited by sunlight by substances causing pollution. Image analysis is also effective when analyzing the distribution of aquatic organisms, birds, or animals.

[0068] As described above, the non-pressurized panel 2 and the analysis image generation system 50 according to this embodiment can be used to analyze various phenomena occurring in various regions to be analyzed.

[0069] In particular, if the aircraft 100 to which the non-pressurized panel 2 is attached is a propeller aircraft, compared to a jet aircraft, it has a lower flight altitude and slower flight speed, so it is possible to obtain high-resolution images that are more suitable for analyzing a predetermined phenomenon occurring in the region under analysis.

[0070] (Other Embodiments) In the above embodiment, there are multiple imaging devices 10A, 10B1, and 10B2, but the embodiment is not limited thereto. There may be one imaging device, as long as there is at least one first imaging device positioned such that the optical axis of the lens 12 is oriented in a substantially vertical direction during horizontal flight. Also, as described above, there may be multiple first imaging devices positioned such that the optical axis of the lens is oriented in a substantially vertical direction during horizontal flight. Furthermore, when there is a first imaging device positioned such that the optical axis of the lens is oriented in a substantially vertical direction and a second imaging device positioned such that the optical axis of the lens is oriented in a direction intersecting the vertical direction, there can be any number of imaging devices, two or more, as long as there is at least one first imaging device and at least one second imaging device.

[0071] When multiple imaging devices are arranged side by side in a horizontal plane approximately perpendicular to the direction of travel of an aircraft 100 in horizontal flight, there may be four or more imaging devices arranged in a row. In that case, considering the acquisition of a balanced image that covers a larger area, it is preferable to arrange the same number of second imaging devices on both sides of the first imaging device. In other words, it is conceivable that the first imaging device is placed in the center, with two or more second imaging devices placed on both sides of the first imaging device.

[0072] As described above, the imaging device may acquire an image of only one wavelength. In that case, it is preferable that the wavelength of the acquired image is one that changes at a level that allows for the identification of the state of absorption, reflection, or excitation by sunlight, depending on whether or not a predetermined phenomenon occurs in the region under analysis.

[0073] Considering all the embodiments described above, the analytical image generation system 50 according to the present invention comprises at least one imaging device 10A, 10B1, 10B2, etc., positioned on the inner surface 4A of an unpressurized panel 2 attached to an unpressurized area 110 on the underside of the fuselage 102 of an aircraft 100, and an image generation unit 40 that generates analytical images for analyzing the state of the area to be analyzed based on images acquired by the imaging devices 10A, 10B1, 10B2, etc., wherein the aircraft 100 periodically flies a predetermined route, and during the flight of the aircraft 100, the imaging devices 10A, 10B1, 10B2, etc., image the area on the underside of the fuselage 102 through a window 6 formed in the unpressurized panel 2, and at least one imaging device 10A, 10B1, 10B2, etc., is positioned such that the optical axis of the lens 12 is oriented in a substantially vertical direction when the aircraft 100 is in horizontal flight.

[0074] Considering all the embodiments described above, the unpressurized panel 2 according to the present invention comprises a panel body 4 that is detachably attached to an unpressurized area 110 below the fuselage 102 of an aircraft 100, and at least one imaging device 10A, 10B1, 10B2, etc., arranged on the inner surface of the panel body 4, wherein a window 6 is formed in the panel body 4, and when the aircraft 100 is in flight, the imaging devices 10A, 10B1, 10B2, etc., image the area below the fuselage 102 through the window 6, and at least one imaging device 10A, 10B1, 10B2, etc., includes an imaging device 10A arranged such that the optical axis of the lens 12 is oriented in a substantially vertical direction when the aircraft 100 is in horizontal flight, and an analytical image for analyzing the state of the area to be analyzed is generated based on the image acquired by the imaging devices 10A, 10B1, 10B2, etc.

[0075] When the unpressurized panel 2 is attached to an aircraft 100 that regularly flies a predetermined route, stationary observation of the area to be analyzed can be easily achieved, continuous imaging from above can be performed without significant cost or effort, and analytical images suitable for analyzing the imaged area can be generated. Furthermore, since the unpressurized panel 2 is detachable, it can be attached to any aircraft that can accommodate panels of the same shape, and one unpressurized panel 2 can be used on various aircraft, contributing to the analysis of various natural and anthropogenic phenomena in various regions.

[0076] Since the panel body 4, which is attached to the unpressurized region 110 of the aircraft 100, is not subjected to large differential pressure, the thickness of the metal plates that make up the panel can be reduced, resulting in a lightweight panel body 4. Furthermore, since the thickness of the window 6 can be reduced, the effects of refractive index can be reduced, and clear images that accurately capture the region to be analyzed can be obtained by imaging devices 10A, 10B1, 10B2, etc. In addition, since imaging device 10A is positioned so that the optical axis of the lens 12 is oriented approximately vertically during horizontal flight, a reference image that does not require correction can be obtained, so an accurate analytical image that accurately captures the region to be analyzed can be obtained.

[0077] (General description) <0> At least one imaging device positioned on the inner surface of an unpressurized panel attached to an unpressurized area of ​​the fuselage of a pressurized aircraft. <1> An analytical image generation system comprising: at least one imaging device positioned on the inner surface of an unpressurized panel attached to an unpressurized area on the lower side of the fuselage of an aircraft; and an image generation unit that generates an analytical image for analyzing the state of an area to be analyzed based on an image acquired by the imaging device, wherein the aircraft periodically flies a predetermined route, and during the flight of the aircraft, the imaging device images the lower side of the fuselage through a window formed in the unpressurized panel, and at least one of the imaging devices includes an imaging device positioned such that the optical axis of the lens is oriented substantially vertically when the aircraft is in horizontal flight. <2> The analysis image generation system according to <1>, wherein the imaging device includes a first imaging device positioned such that the optical axis of the lens is oriented substantially vertically when the aircraft is in horizontal flight, and a second imaging device positioned such that the optical axis of the lens is oriented in a direction intersecting the vertical direction, and images of adjacent regions overlapping in part are acquired by the first imaging device and the second imaging device, and the image generation unit generates a continuous image by connecting the respective images. <3> The analysis image generation system according to <2>, wherein three or more imaging devices are arranged in a line on a horizontal plane substantially perpendicular to the direction of travel of the aircraft in horizontal flight, with the first imaging device positioned in the center, and the second imaging devices positioned on both sides of the first imaging device, and the optical axes of the lenses of the second imaging devices positioned on both sides are oriented in a direction that moves away from the optical axis of the lens of the first imaging device as they move downward. <4> The analytical image generation system according to any one of <1> to <3>, wherein the imaging device acquires an image of a specific wavelength, and the specific wavelength is a wavelength that changes at a level in which the state of absorption, reflection, or excitation by sunlight can be identified depending on whether or not a predetermined phenomenon occurs in the region to be analyzed. <5> The analytical image generation system according to <4>, wherein the image generation unit generates the analytical image using the image data of the specific wavelength and image data of other wavelengths different from the specific wavelength.<6> The analytical image generation system according to any one of <1> to <5>, wherein the image generation unit uses the imaging time recorded in the imaging device to associate the longitude and latitude data, altitude data and tilt data of the aircraft at the imaging time with the image acquired by the imaging device. <7> The analytical image generation system according to any one of <1> to <6>, wherein the aircraft is a propeller plane. <8> The analytical image generation system according to any one of <1> to <7>, wherein the state of the region to be analyzed includes, in the sea, river or lake, the state of red tide occurrence, the state of growth of algae or aquatic plants, the distribution state of aquatic organisms, the distribution state of birds that fly over the water, and the distribution state of waste, and on land, the state of plant growth, the distribution state of animals, and the distribution state of waste. <9> An unpressurized panel comprising: a panel body that is detachably attached to an unpressurized area on the underside of the fuselage of an aircraft; and at least one imaging device disposed on the inner surface of the panel body, wherein a window is formed in the panel body, and the imaging device images the area on the underside of the fuselage through the window when the aircraft is in flight; and at least one of the imaging devices includes an imaging device that is positioned such that the optical axis of the lens is oriented substantially vertically when the aircraft is in level flight; and an analytical image for analyzing the state of the area to be analyzed is generated based on the image acquired by the imaging device. <10> The unpressurized panel according to <9>, further comprising a cooling fan for cooling the imaging device and a battery for supplying power to the imaging device and the cooling fan disposed on the inner surface of the panel body.

[0078] While embodiments and modes of implementation of the present invention have been described, the disclosed content may change in the details of the configuration, and changes in the combination and order of elements in the embodiments and modes of implementation can be realized without departing from the claimed scope and spirit of the present invention.

[0079] 2 Non-pressurized panel 4 Panel body 4A Inner side 6 Window 8 Hinge member 10A First imaging device 10B1, 10B2 Second imaging device 12 Lens 14 Spacer 20 Cooling fan 22 Guide plate 30 Battery 40 Image generation unit 50 Image generation system for analysis 100 Aircraft 102 Fuselage 110 Non-pressurized area

Claims

1. At least one imaging device positioned on the inner surface of an unpressurized panel attached to an unpressurized area of ​​the fuselage of a pressurized aircraft.

2. The imaging device according to claim 1, wherein the imaging device acquires an image of a specific wavelength, and the specific wavelength is a wavelength that changes to a level that allows for the identification of the state of absorption, reflection, or excitation by sunlight depending on whether or not a predetermined phenomenon occurs in the region to be analyzed.

3. The imaging device according to claim 1 or 2, mounted on an aircraft that flies a predetermined route on a regular basis or an unspecified route on an irregular basis, for the purpose of transporting personnel or cargo to another location or for sightseeing or recreational flights.

4. An analytical image generation system that uses the imaging time recorded in the imaging device according to any one of claims 1 to 3 to associate the longitude and latitude data, altitude data, and tilt data of the aircraft at the imaging time with the image acquired by the imaging device.

5. An unpressurized panel comprising: a panel body attached to an unpressurized area of ​​the fuselage of an aircraft; and at least one imaging device disposed on the inner surface side of the panel body, wherein a window is formed in the panel body, the imaging device takes images through the window when the aircraft is in flight, and an analytical image for analyzing the state of the area to be analyzed is generated based on the image acquired by the imaging device.

6. The non-pressurized panel according to claim 5, wherein a cooling fan for cooling the imaging device and wiring for supplying power from the aircraft to the imaging device and the cooling fan are further arranged on the inner surface of the panel body.

7. An analytical image generation system further comprising an image generation unit that generates an analytical image for analyzing the state of an area to be analyzed based on an image acquired by an imaging device according to any one of claims 1 to 3, wherein the aircraft periodically flies a predetermined route, and when the aircraft is in flight, the imaging device images the area below the fuselage through a window formed in the unpressurized panel, and at least one of the imaging devices includes an imaging device positioned such that the optical axis of the lens is oriented substantially vertically when the aircraft is in horizontal flight.

8. The imaging device includes a first imaging device positioned such that the optical axis of the lens is oriented substantially vertically when the aircraft is in horizontal flight, and a second imaging device positioned such that the optical axis of the lens is oriented in a direction intersecting the vertical direction, wherein images of adjacent regions overlapping in part are acquired by the first imaging device and the second imaging device, and the image generation unit generates a continuous image by connecting the respective images, as described in claim 7.

9. The analytical image generation system according to claim 8, wherein three or more imaging devices are arranged in a line on a horizontal plane substantially perpendicular to the direction of travel of the aircraft in horizontal flight, the first imaging device is positioned in the center, the second imaging devices are positioned on both sides of the first imaging device, and the optical axes of the lenses of the second imaging devices positioned on both sides are oriented in a direction that moves away from the optical axis of the lens of the first imaging device as they move downward.

10. The analysis image generation system according to claim 7, wherein the imaging device acquires an image of a specific wavelength, the specific wavelength is a wavelength that changes to a level that allows for the identification of the state of absorption, reflection, or excitation by sunlight depending on whether or not a predetermined phenomenon occurs in the region to be analyzed, and the image generation unit generates the analysis image using the image data of the specific wavelength and image data of other wavelengths different from the specific wavelength.

11. An analytical image generation system according to any one of claims 7 to 10, wherein the state of the region to be analyzed includes, in the case of the sea, river or lake, the state of red tide occurrence, the state of growth of algae or aquatic plants, the distribution state of aquatic organisms, the distribution state of birds that fly over the water, and the distribution state of waste, and on land, the state of plant growth, the distribution state of animals, and the distribution state of waste.

Images