JP2005300179A - Infrared structure diagnosis system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diagnosis system easily detecting and specifying the presence or absence, location, and size of defective parts of structures such as cracks and fragmented surface layers. <P>SOLUTION: The infrared structure diagnosis system is provided with: an imaging part 1 comprising a digital camera 10 for imaging visible images of a structure to be diagnosed, an infrared camera 11 for imaging thermal images of the structure, a laser range finer 12 for measuring the distances between the digital camera 10, the infrared camera 11, and the structure; a pan tilt universal head 2 for inclining the fields of view of the digital camera 10 and the infrared camera 11 in horizontal and vertical directions; and a processor 5 for performing various processings on images captured and acquired by the imaging part 1. The infrared structure diagnosis system is provided with an optical axis adjusting mechanism for adjusting the digital camera 10, the infrared camera 11, and the laser range finder 12 in such a way that deviations of each of their optical axes may fall within a prescribed value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a diagnostic system for diagnosing defects in structures such as buildings and bridges, and more particularly to an infrared structure diagnostic system for diagnosing defects such as concrete and mortar lifting and cracking using infrared rays.

  In recent years, there has been an accident in which concrete of a concrete structure such as a tunnel or a viaduct deteriorates and a part of the concrete is peeled off. In connection with this, establishment of the nondestructive inspection method which can test | inspect the soundness of concrete exactly is calculated | required. As a nondestructive inspection method for concrete, infrared photography (thermography) using an infrared camera and digital photography using a digital still camera are known.

  Infrared photography is a method for grasping the presence or absence and degree of defects based on an image of a concrete surface by light in the infrared region. According to this infrared photography, it is possible to find internal defects near the surface such as floating concrete, mortar, tiles, etc., cavities and jumpers covering the surface of the structure.

  Phenomena where defects are present in structures such as floating parts such as tiles and mortar, junkers in concrete, cavities, and water leakage parts are phenomena in which thermal properties such as thermal conductivity and specific heat differ from healthy parts where no defects exist. Presents. The difference in thermal properties between the sound part and the defective part appears as a difference in surface temperature in the temperature fluctuation of the structure caused by the temperature, solar radiation, or artificial overheating / cooling. Infrared photography in the civil engineering / architecture field is an infrared imaging device that captures an object by irradiating it with infrared rays, and then measures the surface temperature distribution of the object and appears on the thermal image. This is a method for estimating the presence of internal defects based on an abnormal portion of the surface temperature. Specifically, in the infrared photography method, as shown in FIG. 27, since the defect portion 501 generated inside the structure 500 becomes a gap heat insulating layer, the surface temperature generated due to solar radiation or temperature change is reduced. An internal defect can be detected by utilizing the fact that there is a time zone in which a surface temperature difference occurs between the defective portion 501 and the healthy portion in the daily fluctuation.

  On the other hand, the digital photography method is a method of grasping the presence or absence and the extent of defects based on an image of the concrete surface by light in the visible region. According to this digital photography method, it is possible to find cracks in concrete, mortar, tiles, etc. and surface defects.

  These infrared photography and digital photography are excellent in terms of safety during measurement, ease of handling, and high speed of processing, and are rapidly spreading in recent years. As a technique for detecting a defect of a structure using such infrared photography, for example, Patent Document 1 is proposed. As a technique for detecting a defect in a structure using digital photography, for example, Patent Document 2 is proposed.

JP 2001-50921 A JP 2003-57188 A

  Specifically, Patent Document 1 discloses an automatic detection device for an internal defect of an object that automatically detects a defect inside a structure. In particular, this automatic detection device for internal defects of an object includes means for measuring a thermal image of an object in the process of increasing or decreasing the object surface temperature, and means for determining an inflection point of the pixel line by analyzing the pixel line of the thermal image And a means for detecting and calculating an area that is surrounded by these inflection points and that has a convex or concave temperature gradient. As a result, the automatic detection device for internal defects of the object can prevent misdiagnosis due to individual differences in judgment criteria.

  Patent Document 2 discloses a method of capturing at least one image of an existing artificial building and detecting the presence of one or more defects in the artificial building. In particular, the defect detection method includes (a) providing a detectable material on or in an existing man-made structure such that a portion thereof is present in one or more defects of the man-made structure; (B) an imaging step of capturing at least one digital image of the artificial building with an image sensor; and (c) processing the one or more captured digital images to provide a visual image of the artificial building; A processing step for determining the presence of one or more defects in the building, wherein the image sensor captures at least one image of the artificial building and determines the presence or absence of a detectable material in the one or more defects. The above defects are identified. Thereby, in this defect detection method, it is supposed that it can be judged appropriately whether the existing artificial building has a defect.

  However, the conventional infrared photography and digital photography have the following problems.

  First, in order to inspect and diagnose defects such as cracks and cavities, it is necessary to know the presence or absence of a defective part, the position of the defective part, and the size of the defective part. In conventional infrared photography and digital photography, Even if it was possible to detect the presence or absence of a defective part, it was difficult to measure its size.

  In digital photography, since it is impossible to avoid distortion of the captured image, it is necessary to specify which position in the actual structure the position of the defect portion specified on the image corresponds to, There is a problem that this processing takes time.

  Furthermore, in infrared photography, the outline of the structure and the reference point do not appear on the image, so even if the defective part is specified, the position of the actual structure is specified. There is a problem that this processing takes time.

  Furthermore, in infrared photography and digital photography, when a structure is a large building, it is necessary to take a number of partial images and synthesize these partial images. In addition, in the partial image captured at an angle with respect to the structure, the size of the defect on the screen is different even if the size of the actual defect in the structure is the same. Therefore, in the infrared photography method and the digital photography method, there is a problem that it is necessary to obtain the size and shape of the defective portion when such partial images are combined, and this processing takes time.

  In addition, in the method of using infrared photography or digital photography individually, since there is only a display mode in which the captured image is simply displayed or displayed in an enlarged / reduced manner, the defective portion is regarded as a healthy portion. In many cases, it was difficult to distinguish from each other.

  The present invention has been made in view of such circumstances, and it becomes easy to correct image distortion and to synthesize an image, and to easily check for the presence or absence of a defect such as a crack in a structure or a cavity. It is an object of the present invention to provide an infrared structure diagnostic system that can detect not only the position but also the size of the defect portion.

  An infrared structure diagnosis system according to the present invention that achieves the above-described object is an infrared structure diagnosis system for diagnosing a defect of a predetermined structure, and is a digital camera that captures a visible image of a structure to be diagnosed. And an infrared camera that captures a thermal image of the structure; an imaging unit that includes the digital camera and a distance meter that measures a distance between the infrared camera and the structure; and the imaging unit. The pan and tilt means having an angle measuring device for measuring the horizontal angle and the elevation angle of the image pickup means and the image pickup means are obtained by swinging the field of view of the digital camera and the infrared camera in the horizontal direction and the vertical direction. The processing means for performing various processing on the image, and the optical axis of each of the digital camera, the infrared camera, and the rangefinder There has been characterized by comprising an optical axis adjusting means for adjusting to fit within a predetermined value.

  In the infrared structure diagnostic system according to the present invention as described above, the optical axis adjusting means is set so that the deviation of the optical axis of each of the digital camera and the infrared camera constituting the imaging means and the rangefinder is within a predetermined value. Adjust by.

  Here, the imaging means and the optical axis adjusting means are fixedly installed inside one housing.

  Specifically, the optical axis adjusting means can be adjusted with at least three axes of freedom with respect to the digital camera, can be adjusted with at least one axis of freedom with respect to the infrared camera, and The distance meter can be configured as a mechanical mechanism that can be adjusted with at least two degrees of freedom.

  In this case, the optical axis adjusting means has an adjustment screw for finely moving the digital camera holding plate installed with the digital camera fixed in three axes, and the rangefinder holding plate installed with the rangefinder fixed. Has an adjustment screw that finely moves the shaft in two axes. The optical axis adjusting means adjusts the optical axis of the digital camera to be parallel to the optical axis of the infrared camera using an adjusting screw that finely moves the digital camera holding plate in three axes. At the same time, an adjustment screw that finely moves the distance measuring plate holding plate in two axes is used to adjust the distance measuring device so that the optical axis of the distance measuring device is parallel to the optical axis of the infrared camera.

  Further, the optical axis adjusting means is provided with a first optical mirror coated with a dielectric multilayer film that reflects infrared rays on an optical glass in front of the digital camera, and a metal film is coated on another optical glass. The second optical mirror can also be configured using an optical system provided in front of the infrared camera.

  In the infrared structure according to the present invention having such an optical axis adjusting means, the processing means corrects the visible image and the thermal image of the structure so as to have the same field of view and the same angle of view, and the corrected visible image. A thermo-visible fusion image is generated by variably superimposing and fusing the image intensities of the image and the thermal image, and the thermo-visible fusion image is displayed on the display means.

  Further, the processing means displays the visible image and the thermal image of the structure juxtaposed on the display means so as to follow the movement of the field of view of the digital camera and the infrared camera in order to determine an imaging target. After capturing the visible image and the thermal image of the structure and fixing the imaging target, the visible image and the thermal image are corrected to the same scale, and the corrected visible image and the thermal image are juxtaposed on the display means. Then, the visible image and the thermal image of the same scale are corrected so as to have the same field of view and the same angle of view.

  Specifically, the processing means includes a distance between the camera optical system centers of the digital camera and the infrared camera, a distance obtained by the rangefinder, and a horizontal angle obtained by the angle measuring device. And the elevation angle are used to correct the parallax between the digital camera and the infrared camera. Further, the processing means uses the value of the smaller camera lens angle of view between the camera lens angle of view of the digital camera and the camera lens angle of view of the infrared camera, and the digital camera and the infrared camera. Processing to correct the camera lens angle difference is performed.

  Further, the processing means corrects the isometric image and the thermal image so as to have the same field of view and the same angle of view, by correcting distortion of the image lens of the digital camera and the infrared camera. A process of correcting optical distortion, a process of correcting parallax between the digital camera and the infrared camera, and a process of correcting a camera lens field angle difference between the digital camera and the infrared camera are performed. At this time, the processing means includes a distance between the camera optical system centers of the digital camera and the infrared camera, a distance obtained by the distance meter, a horizontal angle and an elevation obtained by the angle measuring device. A process of correcting the parallax between the digital camera and the infrared camera is performed using the depression angle. Further, the processing means uses the value of the smaller camera lens angle of view between the camera lens angle of view of the digital camera and the camera lens angle of view of the infrared camera, and the digital camera and the infrared camera. Processing to correct the camera lens angle difference is performed.

  Further, the processing means calculates the length and / or area of the defective portion by pointing the defective portion of the structure with a pointing device on the screen of the display means for displaying the thermo-visible fusion image, While displaying the length and / or area value of the defective portion on the thermo-visible fusion image on the display means, a list of these defective portions is displayed on the display means as a separate window. That is, in the infrared structure diagnostic system according to the present invention, the visible image and the thermal image obtained by imaging the structure are corrected, and the display that displays the thermo-visible fusion image in which the corrected visible image and the thermal image are superimposed is displayed. The length and / or area of the defective portion is calculated by indicating the defective portion of the structure on the screen of the means with a pointing device.

  In the present invention, it is possible to improve the imaging accuracy of the structure, and it becomes easy to correct distortion of the visible image and the thermal image, and to synthesize the visible image and the thermal image. In addition to being able to easily detect the presence or absence of a defective portion such as a cavity, the position and size of the defective portion can be easily identified.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  This embodiment is an infrared structure diagnostic system that diagnoses a defect of a structure using infrared rays. In particular, this infrared structure diagnostic system can not only detect the presence / absence of a defect, but also can easily identify the position and size of the defective portion.

  As shown in FIG. 1, the infrared structure diagnostic system includes an imaging unit 1 that images a target structure that is a target structure to be diagnosed, and a pan-tilt cloud that shakes the field of view of the imaging unit 1 in the horizontal direction and the vertical direction. A stand 2 and a processing device 5 that performs various processes on the information obtained by the imaging unit 1 are provided.

  The imaging unit 1 includes a digital camera 10 that captures a visible image of the target structure, an infrared camera 11 that captures a thermal image of the target structure, and the distance between both the digital camera 10 and the infrared camera 11 and the target structure. And a laser range finder 12 for measuring.

  The digital camera 10 can be configured using, for example, a digital still camera having an effective pixel number of about 6.1 megapixels (3026 pixels × 2018 pixels). The digital camera 10 captures a visible image of the target structure under the control of the processing device 5 and supplies the obtained visible image to the processing device 5 via the interface circuit 4.

  The infrared camera 11 is, for example, a commercially available infrared camera whose measurement temperature range is about −20 ° C. to 100 ° C. and the number of pixels of the captured image data is about 320 (H) × 240 (V) dots. Can be configured. The infrared camera 11 receives a thermal image of the target structure by receiving infrared rays emitted from the target structure under the control of the processing device 5, and transmits the obtained thermal image to the interface circuit 4. To the processing device 5.

  The laser range finder 12 can be configured using, for example, a commercially available laser range finder having a measurement range of about 0.3 m to 100 m and a measurement accuracy of about ± 3 to 5 mm. The laser range finder 12 emits a laser beam to the target structure and receives reflected light from the target structure under the control of the processing device 5, so that both the digital camera 10 and the infrared camera 11 are connected. The distance to the target structure is measured, and the obtained distance data is supplied to the processing device 5 via the interface circuit 4.

  Although the specific structure of such an image pickup unit 1 will be described in detail later, the digital camera 10, the infrared camera 11, and the laser range finder 12 are housed in a casing (not shown), and a pan / tilt cloud is provided. It is mounted on the base 2 and configured. At this time, the imaging unit 1 is configured such that the digital camera 10, the infrared camera 11, and the laser rangefinder 12 are arranged so as to be directed to substantially the same part of the target structure. In the infrared structure diagnostic system, the spatial coordinate value of the center of the camera optical system of the digital camera 10 and the infrared camera 11 that are spatially separated and the spatial coordinate value of the laser beam emitted from the laser range finder 12 are obtained. It is known and stored in a ROM or the like in the processing device 5.

  The pan / tilt head 2 can be controlled by a normal personal computer, has a horizontal swing angle (horizontal angle; pan) of about ± 130 °, and a vertical swing angle (elevation angle; tilt) of ± 45 °. It can be configured using commercially available equipment. The pan / tilt pan head 2 supports the direction in which the imaging unit 1 is directed so as to be adjustable in the horizontal direction and the vertical direction manually or under the control of the processing device 5. Note that the amount of change of the visual field of the imaging unit 1 from the zero point by the pan / tilt head 2, that is, the horizontal angle and the elevation angle are measured by an angle measuring device (not shown) provided on the pan / tilt head 2. In the infrared structure diagnostic system, this angle data is also supplied to the processing device 5 via the interface circuit 4. In the infrared structure diagnostic system, the pan / tilt head 2 and the interface circuit 4 including the battery are mounted on the tripod 3 and used.

  The processing device 5 may be configured using, for example, a normal personal computer having a color monitor with a memory capacity of 512 MB or more, a hard disk capacity of 2 GB or more, and a monitor resolution of 640 × 480 dots or more. it can. The processing device 5 includes a CPU (Central Processing Unit) 51 that centrally controls each unit, a ROM (Read Only Memory) 52 that stores various information such as programs, and the execution of data and programs supplied from the imaging unit 1. A RAM (Random Access Memory) 53 that temporarily stores data generated therein, an input operation device 54 such as a keyboard and a mouse, and a display device that displays various information such as an LCD (Liquid Crystal Display) 55, an interface circuit 56 that transmits and receives data to and from the imaging unit 1 via the interface circuit 4, and a hard disk device 57 that stores various types of information. Such a processing device 5 controls the imaging unit 1 and inputs a visible image, a thermal image, and distance data obtained by the imaging unit 1 and angle data obtained by an angle measuring device. Various processes are performed on

  Such an infrared structure diagnostic system constituted by each part performs the following operations.

  First, in the infrared structure diagnostic system, as shown in FIG. 2, a visible image of a target structure 60 including a defect 61 such as a crack or a cavity is captured by the digital camera 10 in the imaging unit 1, and the target structure A thermal image of the object 60 is captured by the infrared camera 11 in the imaging unit 1. In the infrared structure diagnostic system, the distance to the target structure 60 at the time of imaging by the digital camera 10 and the infrared camera 11 is measured by the laser rangefinder 12. At this time, in the infrared structure diagnostic system, there are a case where the imaging unit 1 is moved manually and a case where the horizontal swing angle and the vertical swing angle of the pan / tilt head 2 are remotely controlled by the processing device 5. In the infrared structure diagnostic system, the obtained visible image, thermal image, distance data, and angle data are supplied to the processing device 5 via the interface circuit 4.

  The processing device 5 stores an imaging system unit program (to be described later) in the ROM 52, and corrects the acquired visible image and thermal image by executing this program under the control of the COU 51. Further, the processing device 5 generates an image (hereinafter, referred to as a thermal ISO display image) that is obtained by extracting only data in a specific temperature range from the thermal image and displays it, or the thermal image and the visible image are superimposed and merged. The generated image (hereinafter referred to as a thermo-visible fusion image) is generated, and the generated thermal ISO display image and thermo-visible fusion image are stored in an image data file 57A formed in the hard disk device 57 or the like. In the infrared structure diagnostic system, the corrected image, the thermal ISO display image, and the thermo-visible fusion image obtained by processing by the processing device 5 are displayed on the display device 55 and presented to the diagnostician 70. While diagnosing these images, the diagnostician 70 instructs a location corresponding to the defective portion 61 on the image using a pointing device such as a mouse. For example, when the defect 61 is cracked, the diagnostician 70 uses a mouse to trace the defect, and when the defect 61 is a cavity, the diagnostician 70 uses the mouse to define the boundary between the healthy part and the cavity. Use it for tracing. In the infrared structure diagnostic system, the imaging system unit program is executed under the control of the CPU 51 in the processing device 5 in accordance with the operation of the diagnostician 70, and the length, area, and the like of the defect unit 61 are determined. And the calculated defect portion data is stored in the defect portion data file 57B formed in the hard disk device 57 and the like, and specific numerical values of the length and area of the defect portion are sent to the diagnostician 70 via the display device 55. Present.

  Next, software used for the infrared structure diagnostic system will be described.

  Software of the infrared structure diagnostic system is roughly divided into an imaging system section program and an image editing system section program. FIG. 3 shows a flowchart of processing performed by executing the imaging system unit program. FIG. 15, FIG. 17, and FIG. 18 show flowcharts of processing performed by executing the image editing system section program. Hereinafter, each process will be described.

  First, processing performed by executing the imaging system unit program will be described.

  In the infrared structure diagnostic system, when the imaging system section program is started, a control screen as shown in FIG. Of course, this control screen is merely an example, and the present invention is not limited thereto. In the display area 301 on the control screen, the distance obtained by the laser rangefinder 12 is displayed in real time as the distance between the imaging unit 1 and the target structure 60. In the display area 302 on the control screen, the horizontal angle and the elevation angle obtained by the angle measuring device are displayed in real time as the imaging angles of the digital camera 10 and the infrared camera 11. Furthermore, in the display area 303 on the control screen, the measurement temperature range, the type of infrared lens, the temperature level, and the sense sensitivity are displayed as control information of the infrared camera 11 so as to be settable. Furthermore, in the display area 304 on the control screen, the screen size and the type of visible lens are displayed as control information of the digital camera 10 in a settable manner.

  In the infrared structure diagnostic system, when the photographing data input start button 305 on such a control screen is selected via the input operation device 54, in step S100 in FIG. The thermal image and the visible image of the object 60 are displayed side by side on the display device 55 so as to follow the movement of the visual field of the infrared camera 11 and the digital camera 10. Specifically, in the infrared structure diagnostic system, for example, as shown in FIG. 5, real-time images of a thermal image obtained by the infrared camera 11 and a visible image obtained by the digital camera 10 are respectively displayed. Displayed in areas 310 and 311. The image displayed on this screen requests image data from the digital camera 10 and the infrared camera 11 at a constant time interval under the control of the processing device 5, and the sent data is used as it is as the display device 55. Is displayed. At this time, in the infrared structure diagnostic system, a thermal image having a smaller number of pixels than that of the infrared camera 11 is displayed on the display device 55 and a visible image having a smaller number of pixels than that of the digital camera 10 is displayed. By displaying on the device 55, the processing burden on the processing device 5 can be reduced, and a real-time image smoothly following the movement of the visual field of the infrared camera 11 and the digital camera 10 can be displayed on the display device 55.

  In the infrared structure diagnosis system, the diagnostician 70 drives the pan / tilt head 2 manually or based on a control signal from the processing device 5 while visually recognizing this screen, and determines the imaging target as shown in FIG. By selecting the shutter button 312 via the input operation device 54, in step S106 in FIG. 3, the visible image and the thermal image captured by the digital camera 10 and the infrared camera 11 are taken into the processing device 5, and various processes are performed. Do. At this time, in the infrared structure diagnostic system, it is desirable to perform processing on the image with the maximum number of pixels of the digital camera 10 and the infrared camera 11 after capturing the visible image and the thermal image in the processing device 5. The diagnostician 70 is easy to use and can detect the defective portion easily and reliably.

  Specifically, in the infrared structure diagnostic system, when a visible image and a thermal image are taken into the processing device 5, the visible image and the thermal image are corrected to an equal scale, and the corrected isometric image is processed into the processing device. 5 and stored in the RAM 53. In the infrared structure diagnostic system, a lens aberration correction button 313 for performing lens aberration correction processing, a parallax correction button 314 for performing parallax correction processing, and a defect portion designation are displayed on the screen shown in FIG. A defective portion designation screen button 315 for performing processing is mounted, and a transition to lens aberration correction processing, parallax correction processing, and defective portion designation processing described below can be executed.

(A) Lens Aberration Correction In the infrared structure diagnostic system, when the lens aberration correction button 313 shown in FIG. 5 is selected via the input operation device 54, lens correction processing of the captured isometric image is performed in step S101 in FIG. Is executed by the processing device 5. Accordingly, in the infrared structure diagnostic system, the screen displayed on the display device 55 transitions to a screen as shown in FIG. 6, and the corrected thermal image and visible image are juxtaposed in the display areas 310 and 311. To display.

  This lens aberration correction process is a process for correcting optical distortion called distortion of the camera lens, and an example thereof is described in Japanese Patent Application No. 2002-379548. That is, in the infrared structure diagnostic system, a processing called affine transformation is performed by the processing device 5 in order to correct distortion aberration that causes a phenomenon that an image after imaging is distorted in a barrel shape.

  This affine transformation is a method of moving or transforming figures and shapes by a combination of Euclidean geometric linear transformation and parallel movement, and can be represented by 4 × 4 matrix operations. Shear's coordinate transformation. This affine transformation is a transformation method in which geometrical properties are maintained such that points arranged in a straight line in the original figure are arranged in a straight line after conversion, and parallel lines are parallel lines after conversion. Therefore, in the infrared structure diagnostic system, the optical distortion characteristics of the camera lenses of the digital camera 10 and the infrared camera 11, that is, the aberration characteristics of the camera lens are collected in advance as data and stored in the ROM 52 or the like in the processing device 5. Let me. Thereby, in the infrared structure diagnostic system, a visible image and a thermal image from which optical distortion due to the aberration of the camera lens is removed can be obtained by the calculation of the CPU 51 using the data indicating the aberration characteristic of the camera lens.

  In the infrared structure diagnostic system, when such lens aberration correction processing is performed, an image obtained by correcting the visible image obtained by the digital camera 10 and a thermal image obtained by the infrared camera 11 in step S107 in FIG. Is stored in an image data file 57A formed on the hard disk device 57 in the processing device 5.

(B) Parallax correction In the infrared structure diagnostic system, when the parallax correction button 314 shown in FIG. 5 or 6 is selected via the input operation device 54, the parallax correction process is performed in step S102 in FIG. Performed by device 5.

  This parallax correction process is described in detail in Japanese Patent Application No. 2002-379548. That is, since the imaging unit 1 has a structure in which the digital camera 10 and the infrared camera 11 are housed side by side in the housing, there is a shift between the imaging range of the digital camera 10 and the imaging range of the infrared camera 11. That is, parallax occurs.

  As an example, consider a case where a digital camera 10 and an infrared camera 11 are juxtaposed as shown in FIG. Here, for convenience of explanation, it is assumed that the camera lens field angles of the digital camera 10 and the infrared camera 11 are both 30 ° in the horizontal direction and 20 ° in the vertical direction.

  In this case, assuming that the amount of horizontal displacement between the digital camera 10 and the infrared camera 11 is 10 cm, the length of the horizontal imaging range when imaging a subject existing 50 cm in front of the camera lens. Is 26.8 cm, and the length of the imaging range in the vertical direction is 17.6 cm. In this case, it can be seen that the horizontal displacement (10 cm) between the digital camera 10 and the infrared camera 11 is a large ratio of 37.3% with respect to the length of the horizontal imaging range of 26.8 cm. . Hereinafter, this ratio (%) will be referred to as a parallax amount (ratio of image displacement with respect to the entire imaging range).

  On the other hand, when the distance from the digital camera 10 and the infrared camera 11 to the subject is 5 m, the length of the horizontal imaging range is 2.68 m, and the length of the vertical imaging range is 1.76 m. It becomes. In this case, the amount of parallax of the horizontal displacement (10 cm) between the digital camera 10 and the infrared camera 11 is 3.73% with respect to the length of the horizontal imaging range of 2.68 m, and the distance to the subject. It can be seen that the distance is relatively smaller than when the distance is 50 cm.

  As described above, the influence of the positional deviation between the digital camera 10 and the infrared camera 11 varies depending on the distance to the subject. When the subject to be imaged is very close, the influence is very large. Can be almost ignored.

When the amount of positional deviation between the digital camera 10 and the infrared camera 11 is d and the length of the horizontal imaging range is A1, the parallax amount P can be calculated by the following equation (1). In the infrared structure diagnostic system, the calculation of the parallax amount P is executed by the CPU 51 in the processing device 5.
P (%) = (d / A1) × 100 (1)

  In the infrared structure diagnostic system, when a digital camera 10 and an infrared camera 11 having the same horizontal camera lens field angle and the same vertical camera lens field angle are arranged in parallel to capture a subject in the same direction, An image obtained by superimposing and matching the images obtained by either of these two cameras by moving the captured image of one of the cameras in the horizontal direction by the amount of the parallax. Can be synthesized. Further, in the infrared structure diagnostic system, when the camera lens field angles of the digital camera 10 and the infrared camera 11 are different from each other, the distance between the centers of the camera optical systems of the digital camera 10 and the infrared camera 11 and the laser measurement are measured. Using the distance obtained by the distance meter 12 and the horizontal angle and elevation angle obtained by the angle measuring device, the parallax due to the difference in viewpoint between the visible image and the thermal image can be corrected.

  Further, in the infrared structure diagnostic system, when the camera lens field angles of the digital camera 10 and the infrared camera 11 are different, the visible image and the thermal image are corrected so as to have the same field of view and the same field angle. At this time, in the infrared structure diagnostic system, the field of view and the angle of view of the visible image and the thermal image are matched using the value with the smaller camera lens angle of view.

  In the infrared structure diagnostic system, when such a parallax correction process is performed, an image obtained by correcting the visible image obtained by the digital camera 10 and a thermal image obtained by the infrared camera 11 in step S108 in FIG. Is stored in an image data file 57A formed on the hard disk device 57 in the processing device 5.

(C) Display of defective part designation screen In the infrared structure diagnostic system, an input operation is performed on a defective part designation screen button 315 provided on either the lens aberration correction screen shown in FIG. 5 or the parallax correction screen shown in FIG. When the selection is made via the device 54, three defective portion designation screens prepared for designating the defective portion can be displayed on the display device 55 in step S103 in FIG.

  The first defect portion designation screen is an infrared / visible image defect portion designation screen. For example, as shown in FIG. 8, a thermal image is displayed in the display area 310 and a visible image is displayed in the display area 311 side by side. This is the display mode.

  Further, the second defect portion designation screen is a thermo-visible fusion image defect portion designation screen. For example, as shown in FIG. 9, a mode in which a visible image and a thermal image are superimposed and displayed in one display area 330. It is. In the infrared structure diagnostic system, the display density ratio of the visible image and the thermal image to be overlaid can be changed by operating the scroll bar 320 provided on the thermal visible fusion image defect portion designation screen via the input operation device 54. It can be. The thermo-visible fusion image will be described in detail later.

  Further, the third defect portion designation screen is a captured current image defect portion designation screen, and is a mode in which, for example, as shown in FIG. 10, only a visible image is displayed in the display area 340 at the resolution at the time of imaging. That is, in the infrared structure diagnostic system, it is possible to easily point out a defective portion by using a visible image having a high resolution in order to investigate cracks on the surface of the target structure 60 to be diagnosed. .

  In the infrared structure diagnostic system, the diagnostician 70 designates a defective portion such as a crack or a cavity by using a pointing device such as a mouse while visually recognizing these three defective portion designation screens. At this time, in the infrared structure diagnostic system, the defective part designated on one defective part designation screen is reflected on the other two defective part designation screens in real time. In the infrared structure diagnostic system, in step S109 in FIG. 3, the information specifying the defective portion and the information on the defective portion are stored in the defective portion data file 57B formed in the hard disk device 57 in the processing device 5 while being linked. .

(D) Display of Thermal ISO Display Image In the infrared structure diagnostic system, when the ISO display button 318 shown in FIG. 11 is selected via the input operation device 54, the above-described thermal ISO display image as shown in FIG. Transition to the screen to be displayed. This screen is provided with scroll bars 351 and 352 that can be operated via the input operation device 54. In the infrared structure diagnostic system, by operating these scroll bars 351 and 352, a thermal image is displayed. Minimum temperature and maximum display temperature are set. In the infrared structure diagnostic system, when these display minimum temperature and display maximum temperature are set, only data belonging to the set temperature range is extracted from the thermal image obtained by the infrared camera 11 and displayed. The area 350 can be displayed in color.

(E) Quantity Accumulation In the infrared structure diagnostic system, a step shown in FIG. 3 is performed by tracing a portion recognized by the diagnostician 70 as a defective portion on the defective portion designation screen using a pointing device such as a mouse. In S104, the length and area of the defective portion are calculated by the CPU 51. Specifically, in the infrared structure diagnostic system, the length is calculated when the defect portion is cracked, and the area is calculated when the defect portion is floating or hollow. This calculation method is described in detail in Japanese Patent Application No. 2002-379548.

  That is, in the infrared structure diagnostic system, for example, as shown in FIG. 13, the distance between the digital camera 10 and the infrared camera 11 and the target structure 60 is measured in real time by the laser rangefinder 12, and this distance data is processed. Supply to device 5. In the figure, a state in which the distance between the digital camera 10 and the target structure 60 is measured is shown. In response to this, the CPU 51 in the processing device 5 obtains the distance L between the digital camera 10 and the infrared camera 11 and the target structure 60 in real time, and stores it in the RAM 53 or the like.

Here, the angle θ1 shown in FIG. 13 represents the horizontal camera lens angle of view of the digital camera 10, that is, the angle between both ends of the image. This camera lens angle of view θ1 is a known value by the digital camera 10, and this value is stored in the ROM 52 in the infrared structure diagnostic system. Further, the distance A1 shown in the figure is a value indicating the maximum range in the horizontal direction that the digital camera 10 can capture when the distance is L. The distance A1 can be calculated by the following equation (2) using the distance L and the camera lens angle of view θ1. In the infrared structure diagnostic system, the distance A1 is calculated by the CPU 51.
A1 = 2L × tan (θ1 / 2) (2)

  On the other hand, the number of pixels m in the horizontal direction and the number of pixels n in the vertical direction in the image captured by the digital camera 10 are known values. In this case, the image captured by the digital camera 10 is composed of a set of m × n pixels.

Therefore, in this case, the distance A1 of the horizontal imaging range of the target structure 60 corresponds to m pixels on the image by the digital camera 10. For this reason, one pixel in the horizontal direction corresponds to a distance a1 expressed by the following equation (3) in the distance A1 of the horizontal imaging range of the target structure 60.
a1 = A1 / m (3)

  For example, in the infrared structure diagnostic system, the target structure 60 is a concrete surface, and the horizontal distance (horizontal length) of the defective portion (subject) is D1 shown in FIG. In this case, the number of pixels in the horizontal direction on the image by the digital camera 10 is detected, and when the number of pixels is 5, the CPU 51 calculates 5 × a1 to obtain the value of the distance D1. Can be calculated.

  In the infrared structure diagnostic system, the vertical direction of the subject of the target structure 60 in the digital camera 10, that is, the distance or length in the direction perpendicular to the distance A <b> 1 in the same manner as described above. It can be calculated based on the number of pixels n in the vertical direction in the image by the digital camera 10. In this case, in the infrared structure diagnostic system, assuming that the vertical camera lens angle of view of the digital camera 10 is θ2, the CPU 51 substitutes θ2 instead of θ1 shown in the above equation (2), so that the target structure The distance of 60 vertical imaging ranges can be calculated.

  Further, in the infrared structure diagnostic system, in the same manner as the method for the digital camera 10, the distance or length in the horizontal direction and the vertical direction of the subject of the target structure 60 in the infrared camera 11 is also determined. 11 can be calculated based on the number of pixels in the horizontal direction and the vertical direction in the image according to 11.

  In the infrared structure diagnostic system, the actual length and width of a defective portion such as a concrete float or a crack are obtained based on images captured by the digital camera 10 and the infrared camera 11 by performing such arithmetic processing. The area and the like can be calculated. In the infrared structure diagnostic system, for example, as shown in FIG. 14, serial numbers are assigned to the defective parts recognized in this way, and data such as the length and area of the defective parts are tabulated. In step S110, the defect portion data is stored in the defect portion data file 57B formed in the hard disk device 57 or the like, the RAM 53, or the like.

  In the infrared structure diagnostic system, various processes as described above can be performed by executing the imaging system unit program by the processing device 5.

  Next, processing performed by executing the image editing system section program will be described.

  In the infrared structure diagnostic system, by executing the image editing system section program, various image editing processes can be performed on the visible image and the thermal image captured at the site. For example, in an infrared structure diagnostic system, when performing deterioration diagnosis of a large building, a tripod 3 is installed at a predetermined location close to the building and the pan / tilt head 2 is controlled to display a partial image of the building. A plurality of images are taken and taken into the processing device 5. As described above, this captured image is subjected to processing such as lens aberration correction and parallax correction. In the infrared structure diagnostic system, in order to obtain data to be presented to the diagnostician 70, the following is performed. Such image editing processing is performed.

  FIG. 15 shows an image editing process for a visible image by the processing device 5.

  First, in the infrared structure diagnostic system, as shown in the figure, in step S401, so-called thumbnail display for displaying a list of a plurality of captured visible images on a small screen is performed. And in an infrared structure diagnostic system, the file of the imaged visible image is imported in step S402.

  Subsequently, in the infrared structure diagnostic system, individual visible images are zoomed in step S403, and the size of each visible image is changed in step S404. Further, in the infrared structure diagnostic system, in step S405, the rotation angle of the visible image is corrected for each object, and the rotation of each visible image is corrected.

In the infrared structure diagnostic system, in step S406, the tilt of the visible image (the perspective of the visible image captured from an oblique direction) is corrected. For example, as shown in FIG. 16, when the target structure 60 is imaged by the digital camera 10, even if the same size windows 60 a, 60 b, 60 c are installed in the target structure 60, the digital camera 10 Since the distance L and the angle θ are different from each other, the windows 60a, 60b, and 60c are displayed as different sizes on the visible image. Therefore, even if there are defective portions of the same size at the front portion and the corner portion of the target structure 60, these defective portions are displayed as different sizes on the visible image. For this reason, in order to display a visible image similar to the design drawing of the target structure 60, it is necessary to correct the tilt of the visible image. In the infrared structure diagnostic system, since distance data from the digital camera 10 to the target structure 60 is acquired, such tilt correction can be performed very easily. That is, in the infrared structure diagnostic system, in the case of the example shown in FIG. 16, if the visible image is corrected so that a1 and a2 shown in the following equations (4) and (5) have the same size, Good.
a1 = tan (θ1 / 2) · L1 (4)
a2 = tan (θ2 / 2) · L2 (5)

  In the infrared structure diagnostic system, when such tilt correction is performed, parameters such as brightness, contrast, and gamma value of the visible image are adjusted for each object in step S407 in FIG. 15, and in step S408. The sharpness of the visible image is adjusted for each object. Further, in the infrared structure diagnostic system, each object is appropriately moved in step S409, and in step S410, these are combined to generate one visible image.

  In the infrared structure diagnostic system, in step S411, the combined visible image is trimmed, and in step S412, a point where the design drawing of the target structure 60 matches the visible image is designated via the input operation device 54. By doing so, the design drawing and the visible image are synthesized.

  In the infrared structure diagnostic system, an image editing process for a visible image can be performed through such a series of steps.

  On the other hand, in the infrared structure diagnostic system, the image editing process for the thermal image is performed by the processing device 5 through a series of steps as shown in FIG.

  First, in the infrared structure diagnostic system, as shown in the figure, in steps S501 to S506, processing similar to that in steps S401 to S406 for the visible image is performed.

  Subsequently, in the infrared structure diagnostic system, in step S507, the gain of the thermal image and the central temperature at the time of display are adjusted, and in step S508, only the data in the predetermined temperature range is obtained as in the imaging system unit program. The thermal image extracted from the image is displayed in color on the display device 55, and the other regions are displayed in gray scale. Thereafter, in the infrared structure diagnostic system, each object is appropriately moved in step S509, and in step S510, these are combined to generate one thermal image.

  In the infrared structure diagnostic system, in step S511, the combined thermal image is trimmed, and in step S512, a point where the design drawing of the target structure 60 matches the thermal image is designated via the input operation device 54. By doing so, the design drawing and the thermal image are synthesized.

  In the infrared structure diagnostic system, an image editing process for a thermal image can be performed through such a series of steps.

  In the infrared structure diagnostic system, when the image editing system section program is started, the above-described processing involving the image editing processing for the visible image and the image editing processing for the thermal image is performed. Specifically, in the infrared structure diagnostic system, an image editing system section program is executed to perform a series of processes as shown in FIG.

  First, in the infrared structure diagnostic system, as shown in the figure, a visible image layer is created in step S201. The creation of the visible image layer is an image editing process for the visible image shown in FIG. That is, step S202 to step S204 in FIG. 18 specifically correspond to step S401 to step S412 in FIG. In the infrared structure diagnostic system, a composite image of the design drawing of the target structure 60 and the visible image is finally generated. In step S205 in FIG. 18, this composite image is formed as a file on the hard disk device 57 or the like. The image data file 57A is stored.

  Subsequently, in the infrared structure diagnostic system, a thermal image layer is created in step S206. The creation of the thermal image layer is an image editing process for the thermal image shown in FIG. That is, step S207 through step S209 in FIG. 18 specifically correspond to step S501 through step S512 in FIG. In the infrared structure diagnostic system, a composite image of the design drawing of the target structure 60 and the thermal image is finally generated, and the composite image is formed in the hard disk device 57 or the like as a file in step S210 in FIG. The image data file 57A is stored.

  Subsequently, in the infrared structure diagnostic system, in step S211, the visible image and the thermal image generated as described above are displayed on the display device 55, and in step S212, cracks, floats, cavities, etc. on the image are displayed. The length and area of the defective portion are accumulated by tracing the defective portion using a pointing device such as a mouse. In step S213, the data is stored in the hard disk device 57 or the like in a file format that can be viewed by appropriate software. The defect data file 57B is stored.

In the infrared structure diagnostic system, the image edited in this way can be stored in the RAM 53 or the hard disk device 57 in the processing device 5 and displayed on the display device 55 as necessary. For example, in the infrared structure diagnostic system, as shown in the screen of FIG. 19, when the target structure 60 has a crack 361 and a float 362, No. 1 shown in FIG. 2 and no. The data is stored in the RAM 53 and the hard disk device 57 as a deterioration summary table together with the length and area data such as “8”. In the infrared structure diagnostic system, as shown in display areas 363 and 364 on the screen shown in FIG. 19, the crack 361 is displayed in blue and the length is 552 mm, and the float 363 is displayed. Is displayed in red, and the fact that the area is 32013 mm ² is displayed. The diagnostician 70 can easily and immediately recognize the details of the defective portion by viewing such a screen.

  Now, in the infrared structure diagnostic system, as described above, it is possible to generate a thermo-visible fusion image obtained by superimposing and fusing the visible image and the thermal image having the same visual field. Hereinafter, generation of such a thermo-visible fusion image and designation of a defective portion using the image will be described using a screen obtained by imaging a structure actually covered with concrete.

  In the infrared structure diagnosis system, after the imaging target is determined and the visible image and the thermal image are taken into the processing device 5, as described above, the visible image and the thermal image are corrected to the same scale. As shown, the corrected isometric image is juxtaposed and displayed on the display device 55 in the processing device 5. The figure corresponds to the screen shown in FIG. 6 and the like, the left image is a thermal image, and the right image is a visible image. In the infrared structure diagnostic system, by performing the above-described various correction processes on such an isometric image, a visible image and a thermal image having the same field of view and the same angle of view are generated. A thermal-visible fusion image is generated based on the visible image and the thermal image. At this time, in the infrared structure diagnostic system, in order to easily recognize the presence / absence of a defective portion, a visible image is used as a background image as a thermo-visible fusion image, and a thermal image is overlaid on the ground image. Is desirable.

  In the infrared structure diagnostic system, as described above, the display density ratio of the visible image and the thermal image to be superimposed on the thermo-visible fusion image can be changed. Specifically, in the infrared structure diagnostic system, for the image corrected for the visible image and the thermal image shown in FIG. 20, when the thermal image intensity: visible image intensity is set to 75:25, it is shown in FIG. As described above, the display device 55 displays the thermo-visible fusion image in which the component of the thermal image is stronger than the component of the visible image. In the infrared structure diagnostic system, when the thermal image intensity is reduced and the thermal image intensity: visible image intensity is 50:50, as shown in FIG. 22, the visible image component and the thermal image component Are displayed on the display device 55 at the same level. Further, in the infrared structure diagnostic system, when the thermal image intensity is further reduced and the thermal image intensity: visible image intensity is set to 25:75, as shown in FIG. The thermo-visible fusion image superimposed at a weak level is displayed on the display device 55.

  Thus, in the infrared structure diagnostic system, the display density ratio of the visible image and the thermal image can be arbitrarily changed when displaying the thermo-visible fusion image. Therefore, in the infrared structure diagnostic system, when it is desired to grasp the existence of a defective part that cannot be recognized only by a visible image, the thermal image intensity is increased or a defective part is obtained from a thermo-visible fusion image with a reduced thermal image intensity. It is possible to perform an operation of confirming the estimated location by increasing the thermal image intensity.

  In the infrared structure diagnostic system, the diagnostician 70 designates a defective portion using a pointing device such as a mouse while visually recognizing the above-described thermal visible fusion image defect portion designation screen based on such a thermo-visible fusion image. Thus, when the length, area, etc. of the defect portion are calculated, as shown in FIG. 24, for example, a defect diagnosis screen corresponding to the screen shown in FIG. While displaying values, such as a length and an area, a list of these defective parts can be displayed as another window. In addition, in the infrared structure diagnostic system, in order not to obstruct the information of the visible image unnecessarily, after designating the defective part, only the area of the defective part reflects the thermal information, and the area other than the defective part is A heat-visible fusion image obtained by superimposing a transparent heat image on a visible image may be used.

  In this way, in the infrared structure diagnostic system, a tool that is extremely convenient for the diagnostician 70 is generated by generating a thermo-visible fusion image that can arbitrarily change the display density ratio of the visible image and the thermal image to be superimposed. Can be provided.

  Next, an optical axis adjustment mechanism in the infrared structure diagnostic system will be described.

  In the infrared structure diagnostic system, in order to increase the imaging accuracy of the target structure 60, the optical axes of the digital camera 10, the infrared camera 11, and the laser range finder 12 constituting the imaging unit 1 are aligned. Is extremely important. Therefore, the infrared structure diagnostic system includes an optical axis adjustment mechanism that can realize such optical axis alignment. In the infrared structure diagnostic system, the imaging unit 1 and the optical axis adjustment mechanism can be fixedly installed inside one housing.

  As such an optical axis adjustment mechanism, a mechanism that can be adjusted with at least three axes of freedom is provided for the digital camera 10, a mechanism that is adjustable with at least one axis of freedom is provided for the infrared camera 11, and It is conceivable to provide a mechanism capable of adjusting the laser rangefinder 12 with at least two degrees of freedom.

  Specifically, the infrared structure diagnostic system is configured as shown in FIG. In the same figure, the front view which visually recognized the imaging part 1 from the direction where an imaging target exists is shown. In this infrared structure diagnostic system, the infrared camera 11 is fixedly installed inside a predetermined housing 400 using a fixing screw 401. The laser rangefinder 12 is provided inside the housing 400 adjacent to the infrared camera 11. At this time, the laser rangefinder 12 is fixedly installed on a laser rangefinder holding plate 402 erected from the inner bottom surface of the housing 400 using a fixing screw 403, and the laser rangefinder holding plate 402 is The housing 400 is provided with two adjustment screws 404 so as to be finely movable. In the figure, only one adjustment screw 404 is shown, but one adjustment screw 404 is provided in the front-rear direction. Further, the digital camera 10 is fixed to a digital camera holding plate 406 provided on the upper surface of the housing 400 so as to be finely movable using three adjustment screws 405 using fixing screws 407. The three adjustment screws 405 are not arranged linearly, for example, the center adjustment screw in the figure is arranged in the front, and the right and left adjustment screws are arranged in the rear. Thus, it arrange | positions corresponding to the vertex of a substantially triangle. Furthermore, in the infrared structure diagnostic system, an angle measuring device (not shown) that measures the horizontal angle and the elevation angle of the housing 400 is provided.

  As described above, in the infrared structure diagnostic system, the digital camera 10 is mounted on the digital camera holding plate 406 that can be adjusted by the three adjusting screws 405, thereby giving the digital camera 10 three degrees of freedom. Further, in the infrared structure diagnostic system, the infrared camera 11 is fixed and installed in the housing 400 using the fixing screw 401, thereby giving the infrared camera 11 one degree of freedom. Further, in the infrared structure diagnostic system, the laser range finder 12 is fixed to the laser range finder holding plate 402 that can be adjusted by the two adjustment screws 404, so that the laser range finder 12 has two axes. Give a degree of freedom.

  In an infrared structure diagnostic system including such an optical axis adjustment mechanism, the imaging unit 1 is assembled as follows in order to enable optical axis alignment.

  First, in the infrared structure diagnostic system, the laser rangefinder 12 is fixedly installed on the laser rangefinder holding plate 402 using the fixing screw 403, and then the laser rangefinder holding plate 402 is mounted on the casing 400. Are temporarily fixed at two points by two adjusting screws 404. As a result, in the infrared structure diagnostic system, the laser rangefinder 12 is given a degree of freedom of two axes.

  Subsequently, in the infrared structure diagnostic system, the digital camera 10 is fixed to the digital camera holding plate 406 using the fixing screw 407 and then the digital camera holding plate 406 is attached to the housing 400 with three adjustment screws. Temporarily fix at 3 points by 405. Thereby, in the infrared structure diagnostic system, the digital camera 10 is given a degree of freedom of three axes.

  Finally, in the infrared structure diagnostic system, the infrared camera 11 is fixed to the housing 400 using a fixing screw 401 and installed. Thereby, in an infrared structure diagnostic system, the infrared camera 11 is given a uniaxial degree of freedom.

  In the infrared structure diagnostic system in which the imaging unit 1 is assembled in this manner, when adjusting the optical axis of each element, first, two adjustment screws that finely move the laser rangefinder holding plate 402 about two axes. 404 is used to adjust the optical axis of the laser rangefinder 12 to be parallel to the optical axis of the infrared camera 11. Subsequently, in the infrared structure diagnostic system, the optical axis of the digital camera 10 is parallel to the optical axis of the infrared camera 11 by using three adjustment screws 405 that finely move the digital camera holding plate 406 in three axes. Adjust so that

  In the infrared structure diagnostic system, the optical axis parallelism between the digital camera 10 and the laser range finder 12 is checked. If the deviation is larger than ± 0.1 °, for example, the two adjusting screws 404 are attached. By using this, the optical axis of the laser rangefinder 12 is shifted to a position where the deviation is corrected by 50%, for example.

  In the infrared structure diagnostic system, such a process is repeated until the optical axis parallelism of the digital camera 10, the infrared camera 11, and the laser rangefinder 12 is within ± 0.1 °. In the infrared structure diagnostic system, the adjustment screws 404 and 405 are adjusted manually, and the adjustment screws 404 and 405 are driven under the control of the processing device 5 for adjustment. Good.

  As described above, in the infrared structure diagnostic system, the mechanism for mechanically adjusting the optical axes of the digital camera 10, the infrared camera 11, and the laser rangefinder 12 is provided, thereby imaging the target structure 60. Accuracy can be increased.

  In addition, the optical axis adjustment mechanism can be configured using an optical system for realizing optical axis alignment instead of mechanical adjustment.

  Specifically, as shown in FIG. 26, in the infrared structure diagnostic system, a dielectric multilayer film 451 that reflects infrared rays having a wavelength of about 8 μm to 15 μm is coated on an optical glass 450 as an optical axis adjustment mechanism. The first optical mirror is provided in front of the digital camera 10, and the second optical mirror in which a metal film 453 is coated on the optical glass 452 is provided in front of the infrared camera 11.

  In such an infrared structure diagnostic system, the visible light component of the external light incident along the optical axis passes through the first mirror and reaches the camera lens 10 a of the digital camera 10. The light enters the imaging optical system and forms an image with a camera sensor 10b such as a CCD (Charge Coupled Devices). On the other hand, the infrared light component of the external light incident along the optical axis is selectively reflected by the dielectric multilayer film 451 in the first mirror and is incident on the metal film 453 in the second mirror. The infrared light component is reflected by the metal film 453, and then reaches the camera lens 11a of the infrared camera 11, enters the imaging optical system of the infrared camera 11, and forms an image with the camera sensor 11b. .

  Therefore, in the infrared structure diagnostic system, the first mirror and the second mirror are arranged in parallel so that the optical axes of the first mirror and the second mirror coincide with each other, and light from the subject is emitted. By arranging the digital camera 10 and the infrared camera 11 so that the distances to the principal points 10c and 11c of the imaging optical systems of the digital camera 10 and the infrared camera 11 along the axis become equal, the digital camera 10 And the optical axis of the infrared camera 11 can be matched. That is, in the infrared structure diagnostic system, by providing such an optical system, the digital camera 10 and the infrared camera 11 are not individually imaged, but the imaging objects of the digital camera 10 and the infrared camera 11 are the same. Can be.

  Thus, in the infrared structure diagnostic system, the optical axis adjustment mechanism can be configured using a predetermined optical system instead of mechanical adjustment. Here, the angles of view of the optical systems of the digital camera 10 and the infrared camera 11 are often not the same. However, in the infrared structure diagnostic system, by providing such an optical axis adjustment mechanism, the centers of images taken by the digital camera 10 and the infrared camera 11 indicate the same point on the subject. . Therefore, in the infrared structure diagnostic system, the center of the image with the larger angle of view is considered in consideration of the ratio of the visual field sizes calculated based on the angles of view of the optical systems of the digital camera 10 and the infrared camera 11. By cutting out and superimposing the angle of view of the image with the smaller angle of view from the vicinity, the visible image and the thermal image can be superimposed regardless of the distance to the subject. Can be generated.

  The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, it has been described that a defective portion such as a crack or a float is displayed on the display device 55. However, the present invention is not limited to such a display, but a report that is printed and presented to the customer. A function to be created may be added. The report may include image information such as a visible image and a thermal image, information indicating the location of the defective portion, and data such as the length and area of the defective portion, as desired.

  Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

It is a block diagram explaining the structure of the infrared structure diagnostic system shown as embodiment of this invention. It is a figure for demonstrating the function of the infrared structure diagnostic system. It is a flowchart explaining a series of processes performed by executing the imaging | photography system part program in the infrared structure diagnostic system. It is a figure explaining the example of the control screen displayed by starting an imaging | photography system part program. It is a figure explaining the example of the screen which displays the real-time image about the thermal image obtained by the infrared camera, and the visible image obtained by the digital camera. It is a figure explaining the example of the screen which displays the visible image and thermal image after a lens aberration correction process. It is a figure for demonstrating the content of the parallax correction process. It is a figure explaining the example of an infrared and visible image defect part designation | designated screen. It is a figure explaining the example of a thermal visible fusion image defect part designation | designated screen. It is a figure explaining the example of an imaging current image defect part designation | designated screen. It is a figure explaining the example of the screen on which the ISO display button was displayed. It is a figure explaining the example of the screen which displays a thermal ISO display image. It is a figure for demonstrating the content of the quantity integration of a defective part. It is a figure explaining the example of totalization of defect part data. It is a flowchart explaining a series of image editing processes about the visible image performed by executing the image editing system part program in the infrared structure diagnostic system. It is a figure for demonstrating the content of tilt correction. It is a flowchart explaining a series of image editing processes about the thermal image performed by executing the image editing system part program in the infrared structure diagnostic system. It is a flowchart explaining a series of image editing processes performed by executing the image editing system part program in the infrared structure diagnostic system. It is a figure explaining the example of a defective part diagnostic screen. It is a figure explaining the example of the screen which displays the visible image and thermal image after correcting to an equal scale. It is a figure explaining the example of the screen which displays the thermo-visible fusion image in case the thermal image intensity | strength: visible image intensity is set to 75:25 about the image corrected about the visible image and the thermal image shown in FIG. It is a figure explaining the example of the screen which displays a thermo-visible fusion image in case the thermal image intensity | strength: visible image intensity is set to 50:50 about the image corrected about the visible image and the thermal image shown in FIG. It is a figure explaining the example of the screen which displays a thermo-visible fusion image in case the thermal image intensity | strength: visible image intensity is set to 25:75 about the image corrected about the visible image and the thermal image shown in FIG. It is a figure explaining the example of the screen which displays the defect part diagnostic screen and the list | wrist of a defect part. It is a front view of the infrared structure diagnostic system in which the imaging unit is viewed from the direction in which the imaging target exists, and is a diagram for explaining the configuration of the optical axis adjustment mechanism. It is a figure for demonstrating the structure of the optical axis adjustment mechanism using an optical system. It is a figure for demonstrating the principle of the defect part detection by an infrared photography.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image pick-up part 2 Pan tilt pan head 3 Tripod 4 Interface circuit 5 Processing apparatus 10 Digital camera 11 Infrared camera 12 Laser rangefinder 51 CPU
52 ROM
53 RAM
54 Input operation device 55 Display device 56 Interface circuit 57 Hard disk device 57A Image data file 57B Defect portion data file 60 Target structure 61 Defect portion 400 Case 401, 403, 407 Fixing screw 402 Laser rangefinder holding plate 404, 405 Adjustment Screw 406 Digital camera holding plate 450, 452 Optical glass 451 Dielectric multilayer 453 Metal film

Claims (13)

An infrared structure diagnostic system for diagnosing a defect of a predetermined structure,
A digital camera that captures a visible image of a structure to be diagnosed, an infrared camera that captures a thermal image of the structure, and a measurement that measures the distance between the digital camera and the infrared camera and the structure. An imaging means having a distance meter;
A pan-tilt unit having an angle measuring device that mounts the imaging unit, swings the field of view of the digital camera and the infrared camera in the horizontal direction and the vertical direction, and measures the horizontal angle and the elevation angle of the imaging unit;
Processing means for performing various processes on the image obtained by the imaging means;
An infrared structure diagnostic system, comprising: an optical axis adjustment unit configured to adjust an optical axis shift for each of the digital camera, the infrared camera, and the rangefinder to fall within a predetermined value. The infrared structure diagnostic system according to claim 1, wherein the imaging unit and the optical axis adjusting unit are fixedly installed inside one housing. The optical axis adjusting means can be adjusted with at least three axes of freedom with respect to the digital camera, can be adjusted with at least one axis of freedom with respect to the infrared camera, The infrared structure diagnostic system according to claim 1, wherein the mechanical structure is adjustable with at least two degrees of freedom. 4. The infrared structure diagnostic system according to claim 3, wherein the optical axis adjusting means includes an adjusting screw for finely moving a digital camera holding plate on which the digital camera is fixed to three axes. 4. The infrared structure diagnostic system according to claim 3, wherein the optical axis adjusting means includes an adjusting screw that finely moves the distance measuring plate holding the distance measuring device to two axes. The optical axis adjustment means adjusts the optical axis of the digital camera to be parallel to the optical axis of the infrared camera using an adjustment screw that finely moves the digital camera holding plate in three axes. An adjustment screw for finely moving the rangefinder holding plate in two axes is used to adjust the optical axis of the rangefinder to be parallel to the optical axis of the infrared camera. The infrared structure diagnostic system according to claim 4 or 5. The optical axis adjusting means is provided with a first optical mirror coated with a dielectric multilayer film reflecting infrared rays on an optical glass in front of the digital camera, and a second optical glass coated with a metal film on another optical glass. The infrared structure diagnostic system according to claim 1, wherein the optical mirror is provided in front of the infrared camera. The processing means corrects the visible image and the thermal image of the structure so as to have the same field of view and the same angle of view, and variably superimposes and fuses the corrected visible image and thermal image on the image intensity. The infrared structure diagnostic system according to claim 1, wherein a thermo-visible fusion image is generated, and the thermo-visible fusion image is displayed on a display means. The processing means displays a visible image and a thermal image of the structure juxtaposed on the display means so as to follow the movement of the field of view of the digital camera and the infrared camera in order to determine an imaging target, After confirming the target and capturing the visible image and thermal image of the structure, the visible image and thermal image are corrected to the same scale, and the corrected visible image and thermal image are displayed side by side on the display means. The infrared structure diagnostic system according to claim 8, wherein the visible image and the thermal image of the same scale are corrected so as to have the same field of view and the same angle of view. The processing means corrects the optical distortion of the image based on the distortion aberration of the camera lens of the digital camera and the infrared camera when correcting the visible image and the thermal image of the same scale so as to have the same field of view and the same angle of view. A process for correcting a parallax between the digital camera and the infrared camera, and a process for correcting a camera lens angle difference between the digital camera and the infrared camera are performed. The infrared structure diagnostic system according to 9. The processing means includes a distance between the camera optical system centers of the digital camera and the infrared camera, a distance obtained by the distance meter, and a horizontal angle and an elevation angle obtained by the angle measuring device. The infrared structure diagnostic system according to claim 10, wherein a process for correcting parallax between the digital camera and the infrared camera is used. The processing means uses the value of the smaller camera lens field angle of the camera lens field angle of the digital camera and the camera lens field angle of the infrared camera, and the camera lens of the digital camera and the infrared camera. The infrared structure diagnostic system according to claim 10, wherein processing for correcting a difference in angle of view is performed. The processing means calculates the length and / or area of the defective portion by instructing the defective portion of the structure with a pointing device on the screen of the display means for displaying the thermo-visible fusion image. 9. The length and / or area values of the defective portion are displayed on the visible fusion image on the display means, and a list of these defective portions is displayed on the display means as a separate window. Infrared structure diagnostic system.