JPS6052729A - Thermography device - Google Patents

Abstract

PURPOSE:To give hues in positions, which are at distances corresponding to differential temperatures from a reference position, to display areas other than a specific area in a temperature distribution image, by providing a means which obtains the difference between the average temperature of the specific area and that of the other areas. CONSTITUTION:Picture data and character pattern data, which are written in memories 12 and 16 independently of each other, and data for gray scale written preliminarily in the memory 12 are read out simultaneously synchronously with picture scanning of a display device 11 by horizontal and vertical position designating signals from counters 21 and 22. A coloring circuit 32 converts these data to color video signals to which specific hues are added, and a temperature distribution image Z and a gray scale G are classified by color and are displayed. Plural frames are set in this temperature distribution image, and average temperatures of individual areas are obtained, and differences between the average temperature of a specific area and those of the other areas are obtained, and the other areas are displayed in colors corresponding to values of these differences.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to a thermography device that obtains a temperature distribution image, and in particular, calculates the average temperature of a plurality of regions set in the temperature distribution image, and calculates the average temperature of a specific region within the temperature distribution image. The present invention relates to a thermography apparatus that calculates the difference between the average temperature of a region and the average temperature of a subregion, and displays other regions with a uniform hue based on the determined temperature difference.

[Prior Art] Recently, attempts have been made to use the symmetry of the temperature distribution of the human body as a guideline in neurological diagnosis. Specifically, it is believed that the left-right asymmetry in the temperature distribution of the human body is caused by abnormalities in the autonomic nerves, and that the temperature difference between the periphery and the center is related to motor nerves.

[Object and Structure of the Invention] The present invention aims to provide a thermography device suitable for use in this diagnosis, and scans and focuses infrared rays generated from a subject and introduces them into an infrared detector. The temperature data of the pixels constituting the field of view is temporarily stored in a storage means, and the temperature data stored in the storage means is read out and introduced as a video signal to a display device to reproduce the temperature distribution image of the subject. In the thermography apparatus, a plurality of arbitrary areas on the screen of the display means are specified in a thermography apparatus that displays a band-shaped area whose hue changes stepwise corresponding to the temperature range of the IC'fA degree distribution image together with the temperature distribution image. means for reading temperature data of pixels included in a plurality of regions designated by the designation means from the storage means; and means for calculating an average temperature of each region based on the read temperature data of each region. and means for calculating the difference between the average temperature of a specific region and the average temperature of other regions, and adjusting the other regions in the temperature distribution image from the reference position in the band-shaped region to correspond to the difference temperature. The feature is that the display is given the hue of a position far away. Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is an infrared detector, and 2 is an infrared detector for forming an image of the detector on a subject and performing raster scanning. optical scanner, 3
is a reference blackbody for allowing reference infrared rays to enter the detector every time the optical scanner 2 scans horizontally. Infrared rays from the field of view are sequentially incident on the detector 1 based on raster scanning by the optical scanner 2, and the obtained detection signal is sent via an amplifier 4 to a processing circuit 5 having an absolute temperature regeneration circuit, a linearizer, etc. is converted into a temperature signal corresponding to the absolute temperature of the subject. The temperature signal is converted into a digital signal by an A-D converter 6, and then sent to an image memory 8 via a write control circuit 7 and stored therein.

9 is a m degree range setting circuit that calculates the temperature range to be displayed based on the signal a specifying the center temperature and the signal S specifying the temperature width; 10 is a circuit that reads pixel data stored in the image memory 8 and sets the temperature range; This is a read selection circuit for extracting pixels within the temperature range set by the circuit 9, and data of the extracted pixels is stored in the image memory 12 for image display. The pixel data stored in the memory 12 is read out at high speed in synchronization with the television scanning of the monitor color cathode ray tube display @ 11 together with the grayscale data previously stored in the memory 12, and A converter 13. Level shift circuit 14. The signal is sent to the display device 11 via the television signal conversion circuit 15 and colorization circuit 32.

Further, the character information pattern data stored in the character display memory 16 and the frame pattern data stored in the frame display memory 17 are read out at the same time, and the OR circuit 18
After being added by G, information regarding image 2, such as CT (center temperature), TW (temperature width) values, and rectangular frames A, B, C, and D are displayed in a superimposed manner.

19 is a synchronization signal generation circuit that generates standard television synchronization signals H and V to be supplied to the television signal conversion circuit 15;
20 generates one raster at 256 based on the synchronization signal H.
A clock oscillator that generates a pixel clock signal to be divided into pixels, 21 a counter that counts the clock signal and generates a horizontal position designation signal, and 22 a counter that counts the synchronization signal H and generates a vertical position designation signal. be.

Data is read out from the memories 12, 16, 17 and sent to the display device 11 based on the horizontal and vertical position designating signals from the two counters.

23 is a frame writing circuit for writing a frame pattern into the frame display memory 17 based on the frame position data from the frame setting circuits 24A, 24B, 240.24D; 25 is a frame surrounded by a frame based on the frame position data; The pixels included in the area are stored in memory 8.
The memory 8
and an in-frame address setting circuit 26 that sequentially generates an address specifying the corresponding pixel within the frame; Average temperature calculation circuit for calculating the average temperature of 27A.

2'7B, 27C, 27D are registers for storing the average temperature within the four frames determined by the average temperature calculation circuit 26, and 28 to 30 are registers 27B, 27C, 27.
subtraction circuits 31B, 31G, which calculate the difference between each average temperature value stored in D and the average humidity value stored in register 27A;
31D is an addition circuit that adds a signal a specifying the center humidity to the difference temperature determined by the subtraction circuits 28 to 30; the output J of the addition circuit is sent to the memory 12, and the in-frame address setting circuit 25 is written into the frame based on the address signal sent from the address signal.

In the above configuration, the image memory 8 has a storage area of 256 pixels in the horizontal direction, 240 lines in the vertical direction, and 12 bits in the depth direction, as shown in FIG. The temperature data of each pixel obtained by horizontal and vertical scanning by the optical scanner 2 is converted into a digital signal by the A-D converter 6 and stored at the corresponding position with a dynamic range of 12 pits. The data is sequentially rewritten with new data every time one screen is scanned. 25 in the image display memory 12 in exactly the same way as in FIG.
A storage area of 6 pixels x 240 lines is set, and the depth is 6 bits (64 gradations of black and white). Of the 240 lines, image data is stored in the upper 230 lines, and grayscale fixed data is stored in the lower 10 lines. New writing is prohibited in this grayscale data area, and only reading is possible. Grayscale data is at the bottom of the screen.
1 above so that the band-shaped area for 0 lines changes in brightness with a substantially constant slope from the black level at the left end to the white level at the right end.
It is stored in an area for 0 lines.

Furthermore, the character display memory 16 and the frame display memory 17 are also set with storage areas for 256 x 240 pixels, as shown in FIGS. 4 and 5, but in the depth direction, both memories are 1 bit ( There are two gradations (white and black).

Now, the center temperature (CT) is 35°0″C1 due to signal a.
If the temperature range setting circuit 9 specifies the temperature range width (TW) as 3.00°C by the signal, the temperature range setting circuit 9 sets CT±TW/
2 and sends the lower limit temperature (,33,
5°C) and upper limit temperature (36.5°C). The successive selection circuit 10 extracts a specified pixel of 33.5°C or more and less than 36.5°C from all the pixels stored in the image memory 8, and selects one pixel between the temperature range of 3″C. The numerical values are classified into 62 levels from 36.5 to 62 and written to the corresponding position in the image display memory 12.O'' (black level) is given to pixels below 33°5°C. "'63" (white level) is assigned to pixels with temperatures above °C, resulting in a total of 64 gradations.

Further, the character writing circuit 36 controls the character generator based on the signal a specifying the center temperature and the signal A specifying the temperature width, and writes [0-35, OTW 3. A pattern of letters and numbers OOJ is written, for example, in the form of a 5×7 dot matrix as shown in FIG. In this case, since it is sufficient to indicate the presence or absence of a pattern, the memory 16 only needs to have one bit in the depth direction.

The image data, character pattern data, and grayscale data previously written in the memory 12 are stored in the counter 21,
Display device 11 by horizontal and vertical position designation signals from 22
are read simultaneously in synchronization with the screen scanning of the memory 1.
The image data and gray scale data that are outputted one after another are sent to a D-A converter 13. Conversion circuit 15. Coloring circuit 3
2 to the display device @11. Coloring circuit 32
The system classifies the received video data of 64 gradations from the black level to the white level into, for example, 10 levels according to the level as shown in FIG. is converted into a color video signal with a specific hue from color 1 to color 1o added to it, and the color video signal is displayed on a display device@1.
1, a humidity distribution image Z and a gray scale G as shown in FIG. 2 are displayed on the screen in 10 different colors.

Further, the character pattern data is sent to the level shift circuit 14 via the OR circuit 18, and the level shift circuit 14 is sent to the level shift circuit 14 when the character pattern exists.
In order to forcibly shift the level of the video signal sent to the white level to the white level, the rCT
35. , OTW3. The letters OOJ are superimposed on the temperature distribution image Z and displayed as shown in FIG.

In the present invention, when the temperature distribution image Z is displayed in this way, a plurality of frames are set in the temperature distribution image, and a plurality of frames are set in the temperature distribution image based on the temperature data of pixels included in a plurality of areas defined by the frames. Calculate the average temperature of each area, then calculate the difference between the average temperature of a specific area and the average temperature of other areas, and fill in the other areas with a color according to the value of the difference -C display. It is characterized by

That is, the operator first operates the frame setting circuit 24A to arrange a frame A of a desired size at a desired position in the temperature distribution image Z. At this time, the frame setting circuit 24A selects four points Pi for determining the frame.
, P2 , P3 , P4 position data (×+, V+
>, (Xz, Vl >, (Xz.

'/2), (XI, Vz>) and sends it to the frame writing circuit 23.The frame writing circuit 23 connects the above four points with a straight line in the memory 17 according to the position data, as shown by A in FIG. The frame pattern data written in the memory 17 in this way is read out simultaneously with the image data and character pattern data described above in synchronization with the screen scanning of the display device 11, and is read out through the OR circuit 18. Since the second level is sent to the level shift circuit 14, the second
As shown in the figure, frame A is displayed at the set position together with the temperature distribution image.

When the frame Alfi is set in this way, the in-frame address setting circuit 25 receives frame position data (XI, Vl>, (Xz, Vl)) sent from the frame setting circuit 24A.

Based on (Xz, Vz) and (XI, Vz), six pixels (D+ to Dn) included in the area surrounded by frame A in image Z
, and address signals for not reading out the restored temperature data of the n pixels from the image memory 8 are generated in an appropriate order and sent to the image memory 8. n pixels (D
The temperature data from + to Dn> is sent to the average temperature calculation circuit 26. The arithmetic circuit 26 integrates n pieces of temperature data, divides it by n to find the average temperature Ta, and stores the average temperature Ta within the frame A in the register 27A for the frame A.

Next, the operator operates the frame setting circuit 24B in exactly the same manner to set the frame B at a desired position in the temperature distribution image Z.

This frame B may have the same shape as frame A, but may also have a different shape. Then, the frame address setting circuit 25 sends an address signal specifying all pixels included in the frame B to the image memory 8 without reading it.

The average temperature calculation circuit 26 calculates the average temperature Tb in the frame B based on the read humidity data of all pixels included in the area surrounded by the frame B, and stores the average temperature Tb in the temperature B register 27B.

As a result, (Ta-, To) is obtained as the output of the subtraction circuit 28 which calculates the difference between the registers 27A and 27B. This output is sent to the adder circuit 31B and added to the signal a specifying the center temperature to obtain a+ (Ta - Tb), and this addition output is calculated from the reference temperature (T
a − Tb ) 11. FIG. 6(b) is a diagram for explaining the relationship, and point P indicates the addition output a+(Ta −Tb). Then, this addition output is sent to the memory 12 as data for writing,
At the same time, the in-frame address setting circuit 25 again generates an address signal specifying all the pixels in the frame B and sends it to the memory 12, so that the data of all the pixels in the frame B in the memory 12 are a+ (Ta − Tb). This value is read out to the coloring circuit 32.
, the coloring circuit 32 gives the value a color 7 based on FIG. 6(a) and sends it to the display device 11.
The inside of the frame B displayed on the screen of the display device 11 is filled with color 7-color.

Thereafter, in exactly the same manner, by operating the frame setting circuits 24C and 24D, a frame C and a frame are respectively set as shown in FIG.
is determined by the arithmetic circuit 26 and the register 270.27D
are stored respectively.

Then, as the output of the subtraction circuit 29.30, (Ta-Tc
), (Ta - Td) are subtraction circuit 31C931
As the output of 0, a+(Ta −Tc ), a+(Ta−
Td> are obtained, and all pixels in frames C and D in the memory 12 are rewritten to a+ (Ta - Tc) and a+ (7a-7d), respectively.

For example, between Ta, Td, and Tc in Figure 6 (
If there is a relationship not shown in c) and (d), the coloring circuit 30 fills the frame C with the color 9-, and the frame is filled with the color 2-(displayed on the display device 11). will be done.

In this way, frames A, 'B, and C appear in the temperature distribution image.

D is displayed, and the inside of frames B, C, and D are displayed filled with colors 71, 9, and 2, so the operator can confirm that the color in each frame is the center color of the gray scale (color scale). (In this example, color 5 or color 6) allows you to intuitively judge which position the frame is in by comparing it with the color scale, and for frames B and C located on the right side of the center, It can be immediately determined that the average temperature of frames B and C is lower than the average temperature, and among them, the average temperature of frame C is lower than the average temperature of frame B.

Also, the color of the frame (color 2) is on the left side of the center, so frame A
It can be immediately determined that the average temperature of the frame is higher than the average temperature of the frame, and since it is the same distance from the center as the color of frame C, the average temperature of frames C and D is different from the average temperature of frame A. It can be determined that the humidity differences are approximately equal.

[Effect] Therefore, where in the temperature distribution image of the subject is the frame set?
The extent to which the average temperature within the frame differs between a particular frame and other frames can be seen at a glance by comparing the colors assigned to the six colors and the colors assigned to the gray scale.

[Transformation] In the above embodiment, the adder circuit 31B.

Since the signal a specifying the center temperature was added in 31G and 31D, the reference position became the center on the gray scale, but if you add (a-b/2), for example, the position becomes li. becomes the lower limit temperature on the gray scale, that is, the left end, and if (a+b/2> is added), the reference position becomes the upper limit temperature on the gray scale, that is, the right end.However, in the former case, the frame A In the latter case, frames with a higher average temperature than frame A are assigned color 1, so they cannot be compared correctly, and in the latter case, frames B and C, which have lower average humidity than frame A, are assigned color 10, so they cannot be compared correctly. They cannot be compared.To avoid this, consider how to choose frame A as a reference so that the average temperature of frame A is the highest among the four frames in the former, and the lowest in the latter. Just do it.

Further, in the above-described embodiment, a device constructed of individual blocks was illustrated for ease of understanding, but in reality, the frame writing circuit 23. Frame stage setting circuit 24. Frame address setting circuit 25
．． It is possible to replace the operations of the average temperature calculation circuit 26° registers 27Δ to 27D, the subtraction circuits 28 to 30°, the addition circuits 318 to 31D, the temperature range setting circuit 9, etc., and have the memory 16 and memory It is more practical to use one memory for 17.

Further, in the above-described embodiment, the area is specified using a rectangular frame, but the frame may be selected in any shape.For example, the operator may use a light pen or the like to enclose the target area and specify the area using υ.

Furthermore, if only one frame setting circuit is provided and the set frame is slid vertically and/or horizontally to set another frame, the frame setting becomes easy.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing the display state of the screen, FIG. 3 is a diagram showing the arrangement of pixels input to the image memory 8, and FIG. and FIG. 5 shows the memory 16
．． 17 [Illustration to explain the memory area, No. 6]
The figure shows the operation of the colorization circuit 32 and the addition circuits 31B to 31.
FIG. 3 is a diagram for explaining the output of D. 8: Image memory, 9: Temperature range setting circuit, 10: Readout selection circuit, 11: Color cathode ray tube display device for monitor, 12: Memory for image display, 13: D-Δ converter, 14 Two-level shift circuit, 15 : TV signal conversion circuit, 1'6: Character display memory, 17: Frame display memory, 1
8: OR circuit, 19: Synchronous signal generation circuit, 20: Pixel clock oscillator, 21.22: Counter, 23: Frame writing circuit, 24: Frame setting circuit, 25: Frame address setting circuit, 26: Average temperature operation n circuit, 27A to 27D: register, 28 to 30: subtraction circuit, 31B to 31D: addition circuit, 32: coloring circuit. Figure 6

Claims (1)

[Claims] Scanning and condensing infrared rays generated from the subject and introducing them into an infrared detector, temperature data of pixels forming the obtained field of view is temporarily stored in a storage means, and the temperature data stored in the storage means is read out and displayed. It is introduced into the device as a video signal to reproduce the temperature distribution image of the subject, and also displays along with the temperature distribution image a band-shaped area whose hue changes optically depending on the temperature range of the displayed temperature distribution image. In the thermography apparatus, means for specifying a plurality of arbitrary "areas" on the screen of the display means, means for reading temperature data of pixels included in the plurality of areas specified by the specifying means from the storage means; means for calculating the average humidity of each area based on the temperature data of each area, and means for calculating the difference between the average temperature of a specific area and the average temperature of other areas, A thermography apparatus characterized in that each of the other areas is displayed with the same hue as that of a position located a distance corresponding to the temperature difference from the reference position in the band-shaped area.