JP2009162571A - Thermal image photographic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal image photographic device capable of always allowing a user to measure the temperature at the same photographing range as in the case of a thermal image of a measurement object photographed in the past. <P>SOLUTION: By overlappingly displaying a second temperature image visualizing a second temperature data, obtained in advance and a first thermal image under photographed at present, respective geometrical characteristics of the first thermal image and the second thermal image can be compared. According to this, acquiring the first temperature data at the point where the geometric characteristics common to the first thermal image and the second thermal image meet can be supported. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a technique suitable for application to a thermal imaging apparatus.
More specifically, the present invention relates to a thermal image capturing apparatus that can measure temperature data of a measurement object in a range desired by a user.

Conventionally, there is a thermal image capturing device that generates a thermal image of a measurement object. A thermal image is a two-dimensional planar image in which a predetermined color is assigned for each temperature of an object to be measured.
By the way, when aging of a building outer wall progresses, the phenomenon of outer wall peeling which the surface temperature of a building outer wall becomes an abnormal value may arise. For this reason, in order to detect outer wall peeling at an early stage, a thermal image capturing device is used to measure a secular change in temperature at a specific point on the building outer wall. However, the measurement of the secular change in the temperature of the building outer wall by the thermal imaging apparatus is not performed by fixed point observation with the thermal imaging apparatus fixed at a predetermined position. That is, the person who performs the measurement work makes measurements by visiting many shooting points while bringing the shooting device. That is, every time the temperature of the predetermined outer wall is measured, the setting of the thermal image capturing apparatus must be performed. Therefore, in order to measure the temperature in the same range as the previously captured range, specify the position (a specific point on the building outer wall) where the previously captured thermal image and the thermal image being captured overlap exactly Is important.

  For example, Patent Document 1 proposes a program that calculates the similarity between a reference image and an image to be aligned, and obtains a position that can be best superimposed based on the similarity at high speed. Yes.

  Patent Document 2 proposes an apparatus that can superimpose a thermal image taken by an infrared camera and a visible image in a range corresponding to the thermal image.

Japanese Patent Laid-Open No. 10-49681 JP 2002-36653 A

By the way, in the invention described in Patent Document 1, even if the measurement object is the same, it is not possible to calculate the degree of similarity between thermal images whose colors change with the temperature change of the measurement object.
The invention described in Patent Document 2 is a technique for performing alignment and synthesis of images having different optical axes, ie, a visible image and a thermal image, and is not appropriate for strict alignment between thermal images.

  For this reason, it is difficult to identify the same range as the thermal image of the measurement object photographed in the past and capture a thermal image in this range.

  The present invention has been made in view of such a point, and an object thereof is to measure a temperature in the same range as a thermal image taken in the past.

  In order to solve the above-described problems, the present invention provides a temperature measuring unit that measures first temperature data that is temperature data of a measurement object, and first temperature data that stores first temperature data measured by the temperature measuring unit. A storage unit, a first temperature data conversion unit that converts the first temperature data into a first thermal image by assigning a predetermined color for each temperature value of the first temperature data, and temperature data of the measurement object measured in advance A second temperature data storage unit for storing the second temperature data, and a second temperature for converting the second temperature data into a second thermal image by assigning a predetermined color for each temperature value of the second temperature data. A data conversion unit, an image composition unit that synthesizes the first thermal image data with the second thermal image data, and a display unit that displays the image synthesized by the image synthesis unit are provided.

  According to the above configuration, the second temperature image obtained by visualizing the second temperature data acquired in advance and the first thermal image currently being photographed are displayed in an overlapping manner, whereby the geometry of each of the first thermal image and the second thermal image is displayed. The characteristic features can be compared. Thereby, the acquisition of the first temperature data at the time when the geometric features common to the first thermal image and the second thermal image coincide with each other can be supported.

  According to the present invention, a user can take a thermal image of a measurement target being shot in the same shooting range as a thermal image of the measurement target shot in the past. Thereby, the user can measure the temperature in the same imaging range as the thermal image of the measurement object captured in the past at any time.

  Hereinafter, examples of embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an overall block diagram showing an internal configuration of a thermal image capturing apparatus according to an embodiment of the present invention.
The thermal image capturing apparatus 101 provides, in real time, a thermal image (a first thermal image, which will be described later) of the measurement object currently captured on a thermal image (a second thermal image, which will be described later) of the measurement object that has been captured in the past. The first temperature data to be described later corresponding to the first thermal image can be acquired at the time when the geometric characteristics of the second thermal image and the first thermal image coincide with each other.

  The lens 102 of the thermal image capturing apparatus 101 includes a filter that allows only the frequency in the infrared band to pass. For this reason, the light passing through the lens 102 is only light having a frequency in the infrared band (hereinafter referred to as “infrared light”). The infrared light collected from the lens 102 with respect to the measurement object is input to the infrared detector 103, and the energy (hereinafter referred to as “infrared energy”) is detected. Infrared energy detected by the infrared detector 103 is amplified by the amplifier 104 and then converted into digital data by the A / D converter 105, and digital data indicating the surface temperature of the measurement object (hereinafter referred to as “first temperature”). Data ”). Since the value of the infrared energy changes depending on the distance between the object to be measured and the lens 102, when converting the relatively varying infrared energy to the absolute first temperature data, the input red energy A predetermined offset correction is required for the external energy. The lens 102, the infrared detector 103, the amplifier 104, and the A / D converter 105 can be said to be a temperature measuring unit.

  A first temperature data storage unit 106 configured by a RAM (Random access memory) temporarily stores the first temperature data calculated by the A / D converter 105. The first temperature data stored in the first temperature data storage unit 106 is updated to the latest data every predetermined time (for example, the acquisition interval of the first temperature data). The first temperature data storage unit 106 continues to supply the latest first temperature data to the first temperature data conversion unit 107 and the buffer memory 110. Further, the first temperature data storage unit 106 stores the first temperature at the time when a first temperature data storage button (to be described later) is pressed in addition to the area for storing the first temperature data output from the A / D converter 105. An area for storing data is provided.

  The first temperature data conversion unit 107 performs processing based on settings of an image processing setting unit 119 described later, and converts the first temperature data supplied from the first temperature data storage unit 106 into image data (hereinafter referred to as “first heat data”). Image data)). The first thermal image data is temporarily stored in the first image storage unit and input to the image composition unit 109.

On the other hand, the buffer memory 110 stores first temperature data at a predetermined time point through the control of the control unit from the operation unit. Further, the external memory 111 which is a nonvolatile storage stores temperature data of the measurement object acquired in the past. Note that the temperature data stored in the external memory 111 may be temperature data acquired by any measuring device. The external memory 111 may be any device such as a semiconductor storage device, an SD (Secure Digital) memory card, and a compact flash (registered trademark) as long as it is a nonvolatile storage.
Hereinafter, the temperature data stored in the buffer memory 110 or the external memory 111 is referred to as second temperature data.

  The second temperature data stored in either the buffer memory 110 or the external memory 111 is input to the second temperature data storage unit 113 through the selection switch 112 and stored. At this time, the selection switch 112 is switched by the control unit 117.

  The second temperature data conversion unit 114 performs processing based on the setting of the image processing setting unit 119 described later, and converts the second temperature data supplied from the second temperature data storage unit 113 into image data (hereinafter referred to as “second heat”). Image data)). The second thermal image data is temporarily stored in the second thermal image storage unit 115 and input to the image composition unit 109 via the switch 116. However, on / off control of the switch 116 is performed by the control unit 117, and the second thermal image data is input to the image composition unit 109 only when the switch 116 is on.

  Meanwhile, the above-described control unit 117 controls switching of the selection switch 112, the switch 116, and the mode change switch 122 based on an operation on the operation unit 118 by the user. In addition, the control unit 117 reflects the user operation on the operation unit 118 in the image processing setting unit 119. Further, the control unit 117 controls input of the first temperature data from the first temperature data storage unit 106 to the buffer memory 116. The operation unit 118 includes a menu selection button 205, an image save button, an auto button 208, a cancel button 209, and an image capture button 210, which will be described later with reference to FIGS.

  The image processing setting unit 119 performs setting for assigning a predetermined color for each value of temperature data. That is, the image processing setting unit 119 sets a color scale for the thermal image when the temperature data is converted into thermal image data. The image processing setting unit 119 also sets transparency when displaying a thermal image on a monitor or the like. These settings in the image processing setting unit 119 are performed independently for each of the first temperature data and the second temperature data. Details of the setting performed by the image processing setting unit 119 will be described later with reference to FIG.

  The parameter setting screen generation unit 120 generates various setting screens performed by the image processing setting unit 119, which will be described later with reference to FIG. 4, and inputs the setting screens to the display unit 123 through the mode switch 122.

  The parameter display image generation unit 121 generates color bar image data to be described later based on the color scale set by the image processing setting unit 119, and inputs the color bar image data to the image composition unit 109.

  The image composition unit 109 performs image processing for superimposing the latest first thermal image data stored in the first thermal image storage unit 108 and the second thermal image data stored in the second thermal image storage unit 115 as needed. I do. Then, synthesized thermal image data described later is generated by synthesizing the color bar image output from the parameter display image generation unit 121 at a position that does not overlap these thermal images. The combined thermal image data generated by the image combining unit 109 is input to the display unit 123 through the mode switch 122.

  The mode switch 122 is arranged so as to connect either the parameter setting screen generation unit 120 or the image composition unit 109 and the display unit 123. That is, it is a switch for switching between the parameter setting mode and the photographing mode. The mode switch 122 is controlled to be switched by the control unit 117.

FIG. 2A is an external perspective view of a thermal image capturing apparatus as an example of the present embodiment.
FIG. 2B is an external view of a thermal image capturing apparatus as an example of the present embodiment as viewed from above.

As shown in FIG. 2A, the thermal image capturing apparatus 101 main body is provided with an LCD 202 which is an example of a display unit 123.
As shown in FIG. 2A, a slot 204, a menu selection button 205, and an image storage button are provided on the side surface of the main body of the thermal imaging apparatus 101 where the power switch 203 is provided.
A power switch 203 is a switch for turning on / off the thermal image capturing apparatus 101.
The slot 204 is an interface for inputting / outputting data between the external memory 111 and the second temperature data conversion unit 114.

The menu selection button 205 is a button having a function of moving the cursor to select one of a plurality of selection items displayed on the LCD 202 and a function of giving an instruction to “enter” the item selected by the cursor. is there. The operation method of the menu selection button 205 will be described later with reference to FIG.
The first temperature data storage button 206 is a button for storing the temperature data of the measurement object corresponding to the thermal image displayed on the LCD 202 in the first temperature data storage unit 106.

As shown in FIGS. 2A and 2B, a finder 207 and an auto button 208, which is an example of the operation unit 118 shown in FIG. 1, a cancel button 209, and an image capture button 210 are provided on the upper surface of the main body. .
The viewfinder 207 is an example of the display unit 123, and displays a screen similar to the LCD 202.
The auto button 208 is a button for automatically determining setting values for various settings in the image processing setting unit 119.
The cancel button 209 is a button for canceling the “enter” instruction on the menu selection button 205.
The image capture button 210 is a button for freezing the screen displayed on the LCD 202.

The bottom surface of the main body of the thermal imaging apparatus 101 (not shown) has a structure such as a screw hole to which a tripod can be attached.
The user attaches a tripod to the thermal imaging apparatus 101 and manually moves the thermal imaging apparatus 101. Then, the thermal image capturing apparatus 101 is moved to a position desired by the user, thereby capturing an image in a range desired by the user.

3A and 3B are a perspective view of the menu selection button 205 and a view of the menu selection button 205 as viewed from above.
As shown in FIG. 3, the menu selection button 205 can be tilted in four directions of “up”, “down”, “left”, and “right”. The user moves the cursor displayed on the LCD 202 by tilting the menu button in any one of the four directions.
The menu selection button 205 can be pushed in the direction of the arrow. The user gives an “enter” instruction to the item at the cursor position displayed on the LCD 202 by pressing the menu button.

4A, 4B and 4C are screens displayed on the LCD.
Each of the setting screens in FIGS. 4A, 4B, and 4C is an execution screen for the above-described parameter setting mode displayed on the display unit 123 based on the operation of the menu selection button 205 by the user. That is, in conjunction with the operation of the menu selection button 205 by the user, the mode switch 122 shown in FIG. 1 is connected to the parameter setting screen generation unit 120 side. Thereby, each setting screen shown in FIGS. 4A, 4B, and 4C is displayed on the display unit 123 such as the LCD 202.

FIG. 4A is a transparency setting screen 402 for adjusting the transparency of the first thermal image and the second thermal image.
The transparency setting screen 402 is a graphical user interface (GUI) for setting the transparency of the thermal image when the temperature data is converted into thermal image data. The transparency setting screen 402 is a screen including a selection cursor 403, a first transparency setting bar 404, a second transparency setting bar 405, a first transparency adjustment cursor 406, and a second transparency adjustment cursor 407.
The selection cursor 403 is a cursor for selecting one of the first transparency setting bar 404 and the second transparency setting bar 405 by operating the menu selection button 205 shown in FIG. When the selection cursor 403 is moved, the user may tilt the menu selection button 205 in either the “upward direction” or the “downward direction”.

In the first transparency setting bar 404 and the second transparency setting bar 405, values of 0% to 100% indicating the second transparency of the first thermal image and the second thermal image are displayed. A transparency of 0 percent is opaque. The higher the transparency is set, the higher the transparency of the thermal image.
On the first transparency setting bar 404 and the second transparency setting bar 405, a first transparency adjustment cursor 406 and a second transparency adjustment cursor 407 are displayed. The user operates the menu selection button 205 and moves these transparency adjustment cursors to independently adjust the transparency of the first thermal image and the second thermal image. Note that when moving the transparency adjustment cursor, the user may tilt the menu selection button 205 in either the “right direction” or the “left direction”.

FIG. 4B is a color table selection screen 408 for selecting a color table for the first thermal image and the second thermal image.
The color table selection screen 408 is a GUI for selecting a color table 409 for coloring a thermal image when converting temperature data into thermal image data. The color table selection screen 408 is a screen including a selection cursor 403, a first color table selection 410, and a second color table selection 411.
The selection cursor 403 is a cursor for selecting one of the first color table selection 410 and the second color table selection 411 by a user operation on the menu selection button 205. When the selection cursor 403 is moved, the user may tilt the menu selection button 205 in either the “upward direction” or the “downward direction”.

  The first color table selection 410 and the second color table selection 411 can select one of a plurality of color tables 409 such as a color positive 256, a color negative 256, and a mono positive 16, for example. These color tables 409 are stored in advance in a storage device (not shown). The color table 409 is a table composed of numerical data indicating colors assigned for each temperature when the temperature data is converted into thermal image data. For example, when the color scale is “color positive 256”, 256 colors of color are assigned to the temperature data. Further, when the color scale is “mono positive 16”, 16 monochrome gradation colors are assigned to the temperature data. Here, when changing the first color table selection 410 and the second color table selection 411, the user can tilt the menu selection button 205 in either the “right direction” or the “left direction”. Good.

FIG. 4C is a temperature level setting screen 412 for adjusting the temperature levels of the first thermal image and the second thermal image. The temperature level setting screen 412 is a GUI for setting a temperature level when converting temperature data into thermal image data. The transparency adjustment screen is a screen including a selection cursor 403, a temperature level setting bar 413, a second temperature level setting bar 414, a first temperature level adjustment cursor 415, and a second temperature level adjustment cursor 416.
The selection cursor 403 is a cursor for selecting one of the first temperature level setting bar 413 and the second temperature level setting bar 414 by a user operation on the menu selection button 205. When the selection cursor 403 is moved, the user may tilt the menu selection button 205 in either the “upward” direction or the “downward” direction.

The first temperature level setting bar 413 and the second temperature level setting bar 414 display −20 ° C. to 100 ° C. indicating the temperature levels of the first thermal image and the second thermal image.
A first temperature level adjustment cursor 415 and a second temperature level adjustment cursor 416 are displayed on the first temperature level setting bar 413 and the second temperature level setting bar 414. The user operates the menu selection button 205 and moves these temperature level adjustment cursors to independently adjust the temperature levels of the first thermal image and the second thermal image. When the temperature level adjustment cursor is moved, the user may tilt the menu selection button 205 in either the “right direction” or the “left direction”.
Here, the temperature level is the display center temperature of the thermal image. For example, when the temperature level is set to 20 ° C., a color is assigned to the thermal image centering on 20 ° C. based on the color table 409 selected on the color table selection screen 408.

  Each setting value set on the transparency setting screen 402, the color table selection screen 408, and the temperature level setting screen 412 is stored in a RAM (not shown) and used when converting temperature data into thermal image data.

Next, the operation of the thermal image capturing apparatus according to this embodiment will be described.
FIG. 5 is a diagram showing a thermal image of a building photographed in the past displayed on the LCD 202 of the thermal image capturing device.
Hereinafter, the display procedure of how the thermal image of the building taken in the past shown in FIG. 5 is displayed will be described.

  The external memory 111 or the buffer memory 110 stores second temperature data indicating the temperature data of the building measured in the past. The second temperature data is output from either the external memory 111 or the buffer memory 110 to the second temperature data storage unit 113 based on the switching control of the selection switch 112 of the control unit 117.

  The second temperature data is temporarily stored in the second temperature data storage unit 113 and is output to the second temperature data conversion unit 114 at a predetermined timing. The second temperature data output from the second temperature data storage unit 113 to the second temperature data conversion unit 114 indicates a thermal image 502 of a past building based on the setting of the image processing setting unit 119 input by the user. It is converted into second thermal image data. Here, the setting in the image processing setting unit 119 is the “transparency”, “color table”, and “temperature level” that the user performs using the GUI shown in FIGS. 4A, 4B, and 4C. It is a setting. In this example, the second transparency setting bar 405, the second color table selection 411, and the second temperature level setting bar 414 set in the image processing setting unit 119 by the user are shown in FIGS. 4B and 4C. It is assumed that “20%”, “color positive 256”, and “10 ° C.” as shown in FIG. That is, the thermal image 502 of the past building corresponding to the second thermal image data generated by the second temperature data conversion unit 114 has a color scale with a transparency of 20%, a color of 256 gradations, and 256 gradations. An image having a feature that the temperature corresponding to the central color of the color is 10 ° C.

  The second thermal image data of the past thermal image 502 generated by the second temperature data conversion unit 114 is input to the second thermal image storage unit 115 and temporarily stored. The second thermal image data stored in the second thermal image storage unit 115 is input to the display unit 123 such as the LCD 202 through the switch 116, the image composition unit 109, and the mode switch 122. Thereby, the thermal image 502 of the past building is displayed on the LCD 202.

FIG. 6A is a diagram illustrating a state of photographing a measurement object by the thermal image photographing device according to the present embodiment. For example, it is assumed that the measurement object 602 and the thermal image capturing apparatus 101 have the positional relationship shown in FIG. In this case, the range that can be captured by the thermal image capturing apparatus 101 is the capturing range 603. Here, the measurement object 602 is a building taken in the past, and the thermal image is stored in the external memory 111 or the buffer memory 110 as shown in FIG.
FIG. 6B is a diagram showing a synthesized thermal image displayed on the LCD 202 of the thermal image capturing apparatus 101 shown in FIG. The solid line is a thermal image 604 of the building currently being photographed. The broken line shows a thermal image 502 of a past building as shown in FIG. On the right side of the screen displayed on the LCD 202, there is a color bar 605 corresponding to the temperature of the building currently being shot, that is, the color of the thermal image of the building being shot.

Hereinafter, the display procedure of the synthesized thermal image 606 displayed on the LCD 202 will be described.
However, it is assumed that the second thermal image data of the thermal image 502 of the past building shown in FIG.

  First, the user turns on the power switch 203 of the thermal image capturing apparatus 101. Then, the thermal image capturing apparatus 101 is automatically set to the above-described capturing mode, and the mode switch 122 is connected to the image composition unit 109. However, if the parameter setting mode is set in advance, the control unit connects the mode switch 122 to the image composition unit 109 by pressing the cancel button 209 a predetermined number of times, and switches the setting to the shooting mode. be able to.

  Infrared light collected from the lens 102 with respect to the building in the imaging range 603 is input to the infrared detector 103, and the infrared energy thereof is detected. The infrared energy detected by the infrared detector 103 is amplified by the amplifier 104 and then converted into first temperature data which is digital data of the surface temperature of the building in the imaging range 603 by the A / D converter 105. The The first temperature data of the building is temporarily stored in the first temperature data storage unit 106 and input to the first temperature data conversion unit 107. However, the first temperature data stored in the first temperature data storage unit 106 is updated as needed. Therefore, the first temperature data input to the first temperature data conversion unit 107 is the latest.

  The first temperature data output from the first temperature data storage unit 106 to the first temperature data conversion unit 107 is based on the setting value of the image processing setting unit 119 set by the user. Is converted into first thermal image data. Here, the setting values of the image processing setting unit 119 are “transparency” and “color” that the user performs on the image processing setting unit 119 using the GUI shown in FIGS. 4A, 4B, and 4C. It is a set value of “table” and “temperature level”. In this example, the first transparency setting bar 404, the first color table selection 410, and the first temperature level setting bar 413 set in the image processing setting unit 119 by the user are shown in FIGS. 4B and 4C. It is assumed that “70%”, “monopositive 16”, and “20 ° C.” as shown in FIG. In the case of this set value, the thermal image 604 of the building being photographed corresponding to the first thermal image data generated by the first temperature data conversion unit 107 is a gray scale having a transparency of 70% and a color of 16 gradations, In addition, the image has a feature that the temperature corresponding to the center of the 16 gradation colors is 20 ° C.

  The first thermal image data indicating the thermal image of the building being photographed generated by the first temperature data conversion unit 107 is input to the first thermal image storage unit 108, temporarily stored, and the image synthesis unit 109. Is input.

  On the other hand, the setting values of the first color table selection 410 and the first temperature level setting bar 413 (see FIGS. 4B and 4C) set in the image processing setting unit 119 are the parameter display image generation unit 121. Is input. Then, the image data of the color bar 605 is generated based on the first color table selection 410 and the setting value of the first temperature level setting bar 413 input from the image processing setting unit 119 to the parameter display image generation unit 121. The As described above, the first color table selection 410 and the first temperature level setting bar 413 set in the image processing setting unit 119 are “mono positive 16” and “mono positive 16” and “c” as shown in FIGS. 20 ° C ".

  Since the first temperature level is set to “20 ° C.”, the color bar 605 indicates a temperature of 0 ° C. to 40 ° C. which is a predetermined range centering on 20 ° C. In the first color table selection 410, since “mono positive 16” is selected, the color bar 605 has a gray scale gradation of 16 gradations. The black portion of the color bar 605 is 40 ° C., and the white portion is 0 ° C.

  The image data of the color bar 605 generated by the parameter image generation unit 121 is input to the image composition unit 109.

  On the other hand, in the image composition unit 109, the first thermal image data indicating the thermal image 604 of the building under shooting output from the first thermal image storage unit 108, the second thermal image storage unit 115, and the parameter display image generation unit 121. And the second thermal image data indicating the thermal image 502 of the past building are synthesized and generated as a synthesized thermal image 606 together with the color bar 605. The synthesized thermal image 606 is displayed on the LCD 202 via the mode switch 122.

  Through the above procedure, the synthesized thermal image 606 is displayed on the LCD 202 of the thermal imaging apparatus according to the present embodiment.

Next, a first temperature data acquisition method at a time point desired by the user will be described. Here, the point in time desired by the user refers to the moment when the geometric features of the first thermal image and the second thermal image displayed on the LCD 202 overlap.
As described above, when the building 602 and the thermal image capturing apparatus 101 are in the positional relationship shown in FIG. 6A and are in the above-described capturing mode, the LCD 202 of the thermal image capturing apparatus 101 has FIG. A synthesized thermal image 606 shown in FIG.

  The user confirms the synthesized thermal image 606 displayed on the LCD 202 so that the geometric feature of the thermal image 502 of the past building matches the geometric feature of the thermal image of the building 604 being photographed. Then, the thermal image capturing apparatus 101 is moved. In this example, when the user moves the thermal image capturing apparatus 101 from the position illustrated in FIG. 6A to the position illustrated in FIG. 7A, the thermal image capturing apparatus 101 is illustrated in FIG. A synthesized thermal image 702 having the same geometric characteristics as the thermal image 502 of the past building and the thermal image 703 of the building being shot is taken. Then, while the synthesized thermal image 702 is displayed on the LCD 202 of the thermal image capturing apparatus 101, the user presses the first temperature data storage button 206 (see FIG. 2) of the thermal image capturing apparatus 101, thereby controlling the control unit. 117 stores the first temperature data stored in the first temperature data storage unit 106 corresponding to the thermal image 703 of the building being photographed in a predetermined area of the first temperature data storage unit 106.

As described above, in this example, the first thermal image currently captured is displayed in real time on the second thermal image captured in the past, and the geometric characteristics of the second thermal image and the first thermal image match. At the time, the first temperature data corresponding to the first thermal image can be acquired.
Thereby, it becomes possible to always measure the temperature data of the measurement object at the same place, and it is possible to easily and accurately measure the secular change of the surface temperature of the measurement object.

In this example, since the second thermal image is used as a reference image for alignment between thermal images, quantitative first temperature data can be measured regardless of the subjectivity of the measurer.
Further, in this example, since the first thermal image and the second thermal image are synthesized in the apparatus, the image synthesis process after the measurement becomes unnecessary, and inexpensive measurement can be performed.
Furthermore, in this example, since thermal images are compared with each other, the visual field range and the optical axis of the images are the same, and measurement independent of the measurement distance is possible.

  In this example, the second temperature data corresponding to the second thermal image is acquired when the geometric feature of the first thermal image matches the geometric feature of the second thermal image. When the geometric feature of the image matches the geometric feature of the second thermal image, the second temperature corresponding to the second thermal image displayed on the freeze screen after the screen is once frozen by the image capture button 210. Data may be acquired.

  In this example, each setting value (see FIG. 4) necessary for image processing when converting temperature data into thermal image data is set by a user operation on the GUI, but the auto button 208 is pressed. Thus, each set value may be automatically set.

  Further, in this example, the first temperature data at the time when the geometric characteristics of the first thermal image and the second thermal image coincide with each other is measured, but the characteristic in the first thermal image and the second thermal image is measured. The contours may be extracted, and the first temperature data at the time when the contours coincide with each other may be measured.

  As mentioned above, although the example of embodiment of this invention was demonstrated, this invention is not limited to the said embodiment example, Unless it deviates from the summary of this invention described in the claim, other modifications Needless to say, application examples are included.

It is a whole block diagram which shows the internal structure of the infrared imaging device which concerns on one Embodiment of this invention. It is an external view of an infrared imaging device. It is an external view of a menu selection button. It is a figure which shows each setting screen of the infrared imaging device which concerns on one Embodiment of this invention. It is a figure which shows a 2nd thermal image. It is a figure which shows the mode of imaging | photography with the infrared image imaging device which concerns on one implementation mobile phone of this invention. It is a figure which shows the mode of imaging | photography with the infrared image imaging device which concerns on one implementation mobile phone of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Thermal imaging device, 102 ... Lens, 103 ... Infrared detector, 104 ... Amplifier, 105 ... A / D converter, 106 ... First temperature data storage part, 107 ... First temperature data conversion part, 108 ... First One thermal image storage unit 109 109 Image compositing unit 110 Buffer memory 111 External memory 112 Selection switch 113 Second temperature data storage unit 114 Second temperature data conversion unit 115 Second heat Image storage unit 116 ... switch 117 control unit 118 operation unit 119 image processing setting unit 120 parameter setting image generation unit 121 parameter display image generation unit 122 mode switching switch 123 display , 202 ... LCD, 203 ... power switch, 204 ... switch, 205 ... menu selection button, 206 ... first temperature data save button, 20 Finder, 208 auto button, 209 cancel button, 210 image capture button, 402 transparency setting screen, 408 color table selection screen, 412 temperature level setting screen, 502 thermal image of past building, 602 ... object to be measured, 603 ... photographing range, 604 ... thermal image of the building under photographing, 605 ... color bar, 606 ... synthetic thermal image, 702 ... synthetic thermal image

Claims (5)

A temperature measurement unit that measures first temperature data that is temperature data of the measurement object;
A first temperature data storage unit for storing first temperature data measured by the temperature measurement unit;
A first temperature data conversion unit for converting the first temperature data into first thermal image data by assigning numerical data indicating a predetermined color for each temperature value of the first temperature data;
A second temperature data storage unit for storing second temperature data which is temperature data of the measurement object measured in advance;
A second temperature data converter that converts the second temperature data into second thermal image data by assigning numerical data indicating a predetermined color for each temperature value of the second temperature data;
An image synthesis unit for synthesizing the first thermal image data with the second thermal image data;
A display unit for displaying the image synthesized by the image synthesis unit;
A thermal image capturing apparatus comprising: Furthermore, the first temperature data conversion unit and the second temperature data conversion unit comprises an image processing setting unit capable of independently setting the transparency of the first thermal image data and the second thermal image data,
The first temperature data conversion unit and the second temperature data conversion unit convert the first temperature data and the second temperature data into the first thermal image data and the second based on the transparency set in the image processing setting unit. The thermal image capturing apparatus according to claim 1, wherein the thermal image data is converted into thermal image data.   The thermal image capturing apparatus according to claim 2, further comprising an auto button that automatically determines transparency set in the image processing setting unit.   The thermal image capturing apparatus according to claim 2, further comprising an image capturing button that sets the display unit to a frozen state.   The thermal image capturing apparatus according to claim 2, further comprising an operation unit that determines transparency set in the image processing setting unit based on a user operation.

Images