JPH0815043A - Infrared thermal image display method and apparatus - Google Patents

Abstract

(57) [Abstract] [Purpose] Whether the image display system of the TV monitor is the NTSC system or the PAL system, a common camera head is used to display a thermal image in almost the entire area of the screen of the TV monitor. An infrared thermal image display method and device capable of performing the same. A thermal image having a horizontal scanning line number M of 120 is stored in a frame memory. Image display system of TV monitor is NT
In the case of the SC system, the image data of one horizontal scanning line in the frame memory is read twice from the frame memory in duplicate and used as the data of each horizontal scanning line of the field in the TV monitor. That is, the data of one horizontal scanning line of the frame memory is changed to two in the field of the TV monitor.
The data is for horizontal scanning lines (FIG. 1A). When the image display method of the TV monitor is the PAL method, the image data of one horizontal scanning line in the frame memory is sequentially changed to 2
Read from the frame memory once, twice, and three times,
The data is for each horizontal scanning line of the field on the TV monitor (FIG. 1B).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared thermal imaging apparatus (also called thermography) which measures a temperature distribution of an object with an infrared detection element made of InSb or the like and generates a thermal image showing the temperature distribution. In particular, it relates to a method and apparatus for displaying its thermal image.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing a main part of a camera head of a conventional infrared thermal imaging apparatus. This infrared thermal imaging device includes a window 1 made of silicon that allows infrared rays radiated from an object to be measured to enter only a certain field of view, a reflecting mirror 2 that reflects infrared rays that have passed through the window 1, and a reflecting mirror 2. Galvanometer 3 that vertically scans the reflected infrared light, octagonal prism-shaped rotating mirror 4 that horizontally scans the infrared light that is vertically scanned by galvanometer 3, and the vertical scan and rotation by galvanometer 3 An infrared image (thermal image) of the object to be measured by receiving a reflection mirror 5 that reflects infrared rays scanned in the horizontal direction by the mirror 4 and an infrared ray reflected by the reflection mirror 5.
, A detector 7 arranged at a position where the thermal images are connected to each other to generate an analog thermal image signal 107 corresponding to the thermal image, and the analog thermal image signal 107 is amplified to obtain the analog thermal image. The preamplifier 8 outputs the signal 108.

In the infrared thermal imager camera head shown in FIG. 6, the galvanometer 3 scans vertically at 15 Hz.
Since the 8-direction rotating mirror 4 rotating at 14,400 rpm scans in the horizontal direction, a two-dimensional infrared image signal can be generated even if the detector 7 is composed of one element or a small number of elements of about 10. You can In the thermal image generated by the camera head shown in FIG. 6, 120 horizontal scanning lines make up one frame.

FIG. 7 is a block diagram showing an infrared thermal image display device in the infrared thermal image device. This infrared thermal image display device comprises a signal processing section and a TV monitor. The A / D converter 9 uses the analog thermal image signal 108.
Is converted into a digital thermal image signal 109. The frame memory 10 stores one screen worth of thermal image data generated by vertical scanning by the galvanometer 3 and horizontal scanning by the rotating mirror 4. The D / A converter 11 converts the digital thermal image signal 110a read from the frame memory 10 into an analog signal and outputs it to the TV monitor 12 as an analog thermal image signal 111. The TV monitor 12 receives the thermal image signal 111 and displays the thermal image on the screen by interlaced scanning by the NTSC system. One frame on the TV monitor 12 consists of two fields, and one field consists of about 240 horizontal scanning lines. The CPU 13 reads the thermal image data 110b from the frame memory 10 and reads the thermal image data R
The data is output to the S-232C interface 113 and recorded on the floppy disk 14. RS-232
The C interface 113 is connected to another CPU for data analysis via a transmission line.

As described above, in the thermal image generated by the camera head shown in FIG. 6, there are 120 horizontal scanning lines forming one frame. Therefore, in the frame memory 10,
Thermal image data for one frame consisting of image data of 20 horizontal scanning lines is stored. On the other hand, the TV monitor 12
There are 240 horizontal scanning lines forming one field. Therefore, when the thermal image stored in the frame memory 10 is simply read as it is and displayed on the TV monitor 12, the thermal image of one frame composed of 120 horizontal scanning lines is displayed on the screen of the TV monitor 12. The thermal image of the next frame is displayed in the lower half screen area which is displayed in the upper half area and is composed of the remaining 120 horizontal scanning lines. In such a display, a thermal image for two frames is displayed on one screen, which makes the image very difficult to see. The thermal image can be displayed only in the upper half area of the screen, and the lower half area of the screen can be left blank. However, if the 1-frame image is displayed only in the half area of the screen, Is unnatural and does not use the screen effectively.

Therefore, in the signal processing section of FIG.
U13 controls the reading of the thermal image data stored in the frame memory 10, reads the image data of one scanning line in the thermal image stored in the frame memory 10 twice, and the TV monitor 12 uses the frame memory. 10
The image data of one scanning line read out twice consecutively is displayed on two continuous horizontal scanning lines of each field, and so-called data interpolation is performed. By this interpolation, an image of one frame composed of 120 horizontal scanning lines generated by the camera head of FIG. 6 is displayed on the TV monitor 12 over the entire screen. For example, of the 240 horizontal scanning lines in one field of the TV monitor 12, the image data of the first horizontal scanning line in the frame memory 10 is overlapped and displayed on the first and second horizontal scanning lines. Of the 240 horizontal scanning lines in one field of the monitor 12, the image data of the second horizontal scanning line in the frame memory 10 is overlapped and displayed on the third and fourth horizontal scanning lines. Is similarly processed and displayed.

[0007]

In FIG. 7, the image display system of the TV monitor 12 is described as the NTSC system. However, the PAL system TV monitor is replaced by the TV monitor 12
There is a demand in Europe etc. to use it as.
In a PAL system TV monitor, the number of horizontal scanning lines in one field is about 288, and the number of horizontal scanning lines in one frame is about 5.
76. Therefore, when the image display system of the TV monitor 12 is the PAL system, as described above with reference to FIG. 7, the image data of one horizontal scanning line in the frame memory 10 is simply read out twice and displayed on the TV monitor 12. Therefore, the image data of 48 (= 288-240) horizontal scanning lines per field is insufficient for each screen.
The image displayed on the V monitor 12 becomes horizontally longer than usual,
An unfamiliar and hard-to-see thermal image will be displayed.

Therefore, a familiar and easy-to-see thermal image is displayed on the PA.
In order to display on the L type TV monitor 12, in the conventional infrared thermal imaging device, the vertical scanning frequency by the galvanometer 3 in the camera head of FIG. 6 is set to 18 Hz, and the number of horizontal scanning lines of one frame in this camera head is set to 14 Hz.
I have four. If the number of horizontal scanning lines in one frame in the camera head is 144, the image data of one horizontal scanning line in the frame memory 10 is simply read out twice, as in the case of the above-mentioned NTSC image display system, and the TV monitor is read. By displaying the image on the screen 12, the image data of 288 horizontal scanning lines per field can be supplied to the TV monitor 12, and the thermal image can be displayed on the entire area of the screen of the TV monitor 12. It can also be displayed in the method.

However, if the vertical scanning frequency is changed depending on whether the TV monitor 12 is the NTSC system or the PAL system, the frequency of the galvanometer 3 and the rotational speed of the rotary mirror 4 are changed for each image display system of the TV monitor 12. Therefore, the design of the camera head must be changed according to the sales area of the infrared thermal imaging device. For example, if the sales destination is the United States, the NTSC system will be used.
In Europe, it will be the PAL system. As described above, the necessity of manufacturing two types of camera heads having different designs has been one obstacle to reducing the manufacturing cost of the infrared thermal imaging device. Also, CPU1
Read from the frame memory 10 at 3, RS-232C
The image data sent to the interface 113 or recorded on the floppy disk 14 also has two types in the number of horizontal scanning lines in one frame, and therefore there are two types of software for analyzing the image data. The fact that there are two types of thermal images created by the head in terms of the number of horizontal scanning lines hinders reduction of the manufacturing cost of the entire infrared thermal imaging apparatus.

Therefore, an object of the present invention is to use a common camera head regardless of whether the image display system of the TV monitor is the NTSC system or the PAL system, and use a common camera head to display a thermal image on almost the entire area of the screen of the TV monitor. The present invention provides an infrared thermal image display method and device capable of displaying the image.

[0011]

In order to solve the above problems, the present invention provides the following means.

An infrared thermal image composed of image data of M horizontal scanning lines is stored in a frame memory, and the image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is read out a plurality of times to obtain the frame. By displaying the image data of each horizontal scanning line read from the memory as the image data of each horizontal scanning line on the display screen of the television monitor in the order of reading, N (N>
In the infrared thermal image display method of displaying an infrared thermal image composed of image data of horizontal scanning lines on the display screen in M), N / M is r1 when the image display system of the television monitor is NTSC system, and An infrared thermal image display method, characterized in that when N / M is r2 when the image display system of the television monitor is the PAL display system, r1: r2 is approximately 6: 7.

An infrared thermal image composed of image data of M horizontal scanning lines is stored in a frame memory, and the image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is p times (p is 2). Or more integers), and by displaying the image data of each horizontal scanning line read from the frame memory as image data of each horizontal scanning line on the display screen of the television monitor in the order of reading, N ( (N> M) In the infrared thermal image display method of displaying an infrared thermal image composed of image data of horizontal scanning lines on the display screen, p is p1 when the image display system of the television monitor is the NTSC system,
An infrared thermal image display characterized in that when p is p2 when the image display system of the television monitor is the PAL display system, p1 is always 2, and p2 is a repetition of 2, 2 and 3. Method.

An infrared thermal image consisting of image data of M horizontal scanning lines is stored in a frame memory, and the image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is read out a plurality of times to obtain the frame. By displaying the image data of each horizontal scanning line read from the memory as the image data of each horizontal scanning line on the display screen of the television monitor in the order of reading, N (N>
M) In the infrared thermal image display device for displaying an infrared thermal image composed of image data of horizontal scanning lines on the display screen, it indicates whether the image display system of the television monitor is the NTSC system or the PAL display system. The frame memory includes means for inputting TV monitor image display system information, and the frame memory sets N / M when the TV monitor image display system information represents the NTSC system to r1, and sets the TV monitor image display system information to the PAL system. An infrared thermal image display device, wherein r1: r2 is approximately 6: 7 when N / M is r2.

An infrared thermal image consisting of image data of M horizontal scanning lines is stored in a frame memory, and the image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is p times (p is 2). Or more integers), and by displaying the image data of each horizontal scanning line read from the frame memory as image data of each horizontal scanning line on the display screen of the television monitor in the order of reading, N ( (N> M) In the infrared thermal image display device for displaying an infrared thermal image composed of image data of horizontal scanning lines on the display screen, whether the image display system of the television monitor is the NTSC system or the PAL display system. Means for inputting the television monitor image display system information, which indicates that the television monitor image display system information is N. The p when representing the SC scheme p
1 and p is p2 when the TV monitor image display system information represents the PAL system, p1 is always 2
And p2 is a repetition of 2, 2, and 3. An infrared thermal image display device characterized in that

An infrared thermal image consisting of image data of M horizontal scanning lines is stored in a frame memory, and the image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is p times (p is 1). Or an integer greater than or equal to) and displaying the image data of each horizontal scanning line read from the frame memory as image data of each horizontal scanning line on the display screen of the television monitor in the order of reading, thereby providing an interlaced scanning method. An infrared thermal image consisting of image data of N (N> M) horizontal scanning lines scanned by is displayed on the display screen, and p is p1 when the image display system of the television monitor is the NTSC system. When p is p2 when the image display system of the television monitor is the PAL display system, p1 is always 2,
p2 is an infrared thermal image display method in which 2, 2 and 3 are repeated, and is the earliest of the three consecutive horizontal scanning lines corresponding to the P2 = 3 in the first field of the interlaced scanning. Is displayed next to the last of the three consecutive horizontal scan lines corresponding to P2 = 3 in the second field of the interlaced scan, or in the second field of the interlaced scan. The earliest of the three consecutive horizontal scan lines corresponding to P2 = 3 is the last of the three consecutive horizontal scan lines corresponding to P2 = 3 in the first field of the interlaced scan. Infrared thermal image display method characterized in that the image is displayed adjacent to and subsequent to the above.

An infrared thermal image consisting of image data of M horizontal scanning lines is stored in a frame memory, and the image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is p times (p is 1). Or an integer greater than or equal to) and displaying the image data of each horizontal scanning line read from the frame memory as image data of each horizontal scanning line on the display screen of the television monitor in the order of reading, thereby providing an interlaced scanning method. An infrared thermal image consisting of image data of N (N> M) horizontal scanning lines scanned by is displayed on the display screen, and the image display system of the television monitor is the NTSC system or the PAL display system. Means for inputting the television monitor image display system information indicating that the television monitor image display system information is NT. The p when a C method p1
In the infrared thermal image display device, when p is p2 when the TV monitor image display system information represents a PAL system, p1 is always 2, and p2 is a repetition of 2, 2 and 3. In the first field of the interlaced scan, the earliest of the three consecutive horizontal scanning lines corresponding to P2 = 3 is the three consecutive lines corresponding to the P2 = 3 in the second field of the interlaced scan. Of the three consecutive horizontal scan lines corresponding to the P2 = 3 in the second field of the interlaced scan. Is displayed adjacent to the last one of the three consecutive horizontal scanning lines corresponding to P2 = 3 in the first field of the interlaced scanning. That infrared thermal image display device.

[0018]

In the infrared thermal imager, although the horizontal scanning line number M of the infrared thermal image stored in the frame memory is constant, the image display system of the television monitor (TV monitor) is N.
The number N of horizontal scanning lines on the display screen of the TV monitor changes depending on whether it is the TSC system or the PAL system. In the present invention, T
V monitor image display system is NTSC system or PA
A thermal image with an appropriate number of horizontal scanning lines according to the L system is displayed on the TV.
Be ready to feed the monitor.

In the present invention, depending on whether the image display system of the TV monitor is NTSC system or PAL system, N / M
Be selected as r1 or r2, and those r
The number of times the image data of one horizontal scanning line stored in the frame memory is read redundantly so that the ratio of 1 to r2 is approximately 6: 7 (per field of TV monitor).
Is set in advance.

For example, let M be 120 now. At this time, as described above, the number of horizontal scanning lines of the thermal image of one field on the TV monitor is N, and the NTSC system and PA are used.
If N in the L direction is N1 and N2, respectively, N1
Is about 240 and N2 is about 288. In this example, N1
/ M = r1 = 240/120 and N2 / M = r2 =
288/120 and r1: r2≈6: 7.

In the present invention, depending on whether the image display system of the TV monitor is the NTSC system or the PAL system, N / M
Be selected as r1 or r2, and those r
The number of times the image data of one horizontal scanning line stored in the frame memory is read redundantly so that the ratio of 1 to r2 is approximately 6: 7 (per field of TV monitor).
Is set in advance, but in a typical example,
According to the present invention, when the image data of one horizontal scanning line in the frame memory is read p times redundantly and used as the data of each horizontal scanning line in the TV monitor, the TV monitor is NT.
Let p1 be p in the SC system and p2 in the PAL system when the TV monitor is p2. On the other hand, p2 is sequentially changed by repeating 2, 2 and 3 depending on the order of horizontal scanning lines read from the frame memory.

For example, when the TV monitor is of the PAL system, the image data of the first scanning line in the frame memory is read twice, the image data of the second scanning line in the frame memory is also read twice, and the third image data in the frame memory is read third. The image data of the scanning line is read three times. The number of times p2 of reading the image data of the fourth and subsequent scanning lines in the frame memory is set to 2, 2, and 3 times depending on the order of reading. And
In the TV monitor, the image data of the first and second horizontal scanning lines are both the image data of the first scanning line in the frame memory, and the image data of the third and fourth horizontal scanning lines are both the second image data of the second in the frame memory. The image data of the scanning lines, the image data of the fifth, sixth, and seventh horizontal scanning lines are both the image data of the third scanning line in the frame memory, and the image data of the eighth and subsequent horizontal scanning lines are up to here. The same operation is repeated. By performing the reading from the frame memory and the scanning on the TV monitor as in the above example, the r1: r2 is reduced 6:
Can be set to 7.

In the inventions described in (1) and (2), in the PAL display method of the interlaced scanning method (interlaced scanning method), three continuous horizontal scanning lines corresponding to P2 = 3 are provided in the first field and the second field. I try not to overlap. The image formed by the three continuous horizontal scanning lines is emphasized as compared with the image formed by the two continuous horizontal scanning lines. The field and the second field are made different from each other to prevent a specific image area from being overemphasized in the first field and the second field.

[0024]

EXAMPLES Next, the present invention will be described in more detail by way of examples.

FIG. 1 is a schematic diagram showing horizontal scanning lines in a TV monitor that displays a thermal image by the infrared thermal image display method according to an embodiment of the present invention. 1A and 1B show a horizontal scanning line when the TV monitor is an NTSC system and a horizontal scanning line when the TV monitor is a PAL system, respectively.

In FIG. 1A, a rectangular frame shows the outline of the screen of the TV monitor. The numbers 1 to 120 written on the outside of the left side of this screen indicate the numbers of horizontal scanning lines of the thermal image when the thermal image is stored in the frame memory, and are written outside of the right side of the screen. Numbers with parentheses (1)
(240) indicates the numbers of the horizontal scanning lines forming the field on the TV monitor. Each part in FIG. 1B is the same as that described in FIG. 1A, but the numbers in parentheses on the outside of the right side of the screen are (1) to
(288).

The infrared thermal image display method of this embodiment can be carried out by the infrared thermal imager including the camera head shown in FIG. 6 and the infrared thermal image display shown in FIG. T
Data (TV monitor image display method information) indicating whether the image display method of the V monitor 12 is the NTSC method or the PAL method is manually input from a keyboard (not shown in FIG. 7) connected to the CPU 13. Operate with the CPU
Input in advance to 13. The TV monitor image display method information is input from the thermal image data 110 from the frame memory 10.
a is read out and the thermal image data 110a is read by the D / A converter 1
In step 1, the thermal image data 111 is converted into analog thermal image data 111, the thermal image data 111 is sent to the TV monitor 12, and the thermal image is transferred to the T
This is performed prior to the data reading process by the CPU 13 for displaying on the V monitor 12.

In the infrared thermal imaging device to which the method of this embodiment is applied, the horizontal scanning line number M of the infrared thermal image stored in the frame memory 10 is 120, which is constant. In the present embodiment, depending on whether the image display system of the TV monitor 12 is the NTSC system or the PAL system, the TV monitor 1
The number N of horizontal scanning lines in the thermal image data for one field sent to 2 is changed so that the thermal image can be displayed in almost the entire area of the display screen of the TV monitor 12.

As described above, 1 in the TV monitor 12
NSC is the number of horizontal scanning lines of the field thermal image
If N in the scheme and N in the PAL method are N1 and N2, respectively, N1 is approximately 240 and N2 is approximately 288. In the present invention, r1 and r1 are set according to whether the image display system of the TV monitor 12 indicated by the TV monitor image display system information previously input to the CPU 13 is the NTSC system or the PAL system.
The relationship between M, N1 and N2 is selected so that the ratio to 2 is approximately 6: 7. The number of times p (per one field of the TV monitor) of reading image data of one horizontal scanning line stored in the frame memory 10 in duplicate is set from the keyboard so that the ratio of r1 and r2 is approximately 6 to 7. Input and preset in the CPU 13.

In this embodiment, N1 / M = r1 = 240
/ 120, N2 / M = r2 = 288/120, and r1: r2≈6: 7.

As described above, the image display system of the TV monitor 12 indicated by the TV monitor image display system information is NTSC.
N / M is r1 or r2 depending on the system or PAL system.
The image data of one horizontal scanning line stored in the frame memory is read out redundantly so that the ratio of r1 and r2 is approximately 6: 7 (1 for the TV monitor). (Per field) p is set in advance. In the method of this embodiment, the frame memory 1
When the image data of one horizontal scanning line at 0 is read p times redundantly and used as the data of each horizontal scanning line at the TV monitor 12, p when the TV monitor 12 is the NTSC system is set to p1, and the TV monitor If p in the PAL system is p2, p1 is always 2. On the other hand, as shown in FIG. 1B, p2 is sequentially changed by repeating 2, 2 and 3 depending on the order of horizontal scanning lines read from the frame memory 12.

More specifically, when the TV monitor indicated by the TV monitor image display method information is the PAL method, the same image data of the first scanning line in the frame memory 12 is read twice. , The image data of the second scanning line in the frame memory 12 is also read twice by duplicating the same data.
The image data of the third scan line in
Read twice. The number of times p2 of reading the image data of the fourth and subsequent scanning lines in the frame memory 10 is repeated 2, 2, and 3 times according to the order of reading. Then, on the TV monitor 12, 1, 2
The image data of the second horizontal scanning line are both frame memory 1
The image data of the first scanning line at 0 is set, and the image data of the third and fourth horizontal scanning lines are both set in the frame memory 10.
Image data of the second scanning line in
The image data of the second horizontal scanning line are both frame memory 1
For the image data of the third scanning line at 0, and for the image data of the eighth and subsequent horizontal scanning lines, the same operation is repeated. By performing the reading from the frame memory 10 and the scanning on the TV monitor 12 as in the above example, r1: r2 can be set to 6: 7.

According to the method of this embodiment, the TV monitor 12
When the image display system of the TV monitor 12 is the NTSC system, a thermal image is displayed on almost the entire area of the screen by horizontal scanning lines as shown in FIG. 1A.
When the image display method is the PAL method, a thermal image is displayed on almost the entire area of the screen by horizontal scanning lines as shown in FIG. Further, if the method and apparatus of this embodiment are applied, R
Regarding the number of horizontal scanning lines in the thermal image data output to the S-232C interface 113 and the thermal image data recorded on the floppy disk 14, whether the image display system of the TV monitor 12 is the NTSC system or the PAL system. Regardless of, the TV monitor 1
The thermal image can be analyzed by one type of software that does not need to be changed depending on the image display method of 2.

FIG. 2 is a diagram schematically showing the screen of the TV monitor 12 when the infrared thermal image display method of the embodiment of FIG. 1 is applied to the PAL interlaced scanning method.
In this figure, the solid line shows the scanning line of the first field (1st field), and the broken line shows the scanning line of the second field (2nd field). In the interlaced scanning method of the PAL method, the first and second fields each have about 288 horizontal scanning lines, and one frame includes about 576 horizontal scanning lines.

On the outer left side of the screen of FIG. 2, the number of the horizontal scanning line of the thermal image data stored in the frame memory 10 that is displayed as the first field is 1.
1, 2, 3, 3, 3, 3, 4 and the number of times the image data of each horizontal scanning line is read from the frame memory 10 is described as 2, 2, 3 times.

On the outer right side of the screen of FIG. 2, among the horizontal scanning lines of the thermal image data stored in the frame memory 10, the numbers displayed as the second field are 1, 1, 2 and 2. , 3, 3, 3, 4, and the number of times that the image data of each horizontal scanning line is read from the frame memory 10 is described as two times, two times, and three times. FIG. 4 is a diagram showing the order in which the horizontal scanning line numbers relating to the thermal image data stored in the frame memory 10 are displayed on the screen of FIG. 2 in the first field and the second field and arranged in time order. is there. As is clear from this figure, the data of the horizontal scanning line number 3 in the frame memory 10 is
The first and second fields are displayed six times in total. On the other hand, in the frame memory 10, the data of the horizontal scanning line numbers 1 and 2 are continuously displayed four times including the first field and the second field. Therefore, the data of the horizontal scanning line number 3 in the frame memory 10 is displayed by being emphasized by 6/4 = 1.5 times the data of the horizontal scanning line numbers 1 and 2 in the frame memory 10. Other data such as the data of the horizontal scanning line number 6 in the frame memory 10 which is continuously displayed three times in each field is similarly emphasized and displayed as compared with the other data at the upper and lower positions on the screen. . As described above, if the embodiment of FIG. 1 is simply applied to the PAL interlaced scanning method as it is, only the data of a specific scanning line may be emphasized and a non-uniform image may be displayed. When this problem is improved and the present invention is applied to display a thermal image by the interlace scanning method of the PAL system, only the data regarding a specific scanning line is selected from the thermal image data acquired by the camera head of the infrared thermal imaging device. Minimize the emphasis,
An example of an infrared thermal image display method and apparatus for maintaining homogeneity in image display, that is, an embodiment of the invention described in the above, will be described below.

FIG. 3 schematically illustrates a screen when a thermal image is displayed on the TV monitor 12 by the PAL interlaced scanning method in order to explain the embodiment of the invention described in the above. It is a figure.

On the outer left side of the screen in FIG. 3, the number of the horizontal scanning line of the thermal image data stored in the frame memory 10 that is displayed as the first field is 1.
1, 2, 2, 3, 3, 3, 4, 4, 5, 5, 6 and the image data of each horizontal scanning line is read from the frame memory 10 twice, twice, and three times. Times 2
It is written once and twice.

On the outer right side of FIG. 3, among the horizontal scanning lines of the thermal image data stored in the frame memory 10, the number displayed as the second field is 1.
2,2,2,3,3,4,4,5,5,5, and the image data of each horizontal scanning line is the frame memory 1
The number of times 0 is read once, 3 times, 2 times, 2 times, 3
It is written as a time.

In FIG. 5A, the order in which the horizontal scanning line numbers in the thermal image data stored in the frame memory 10 are displayed on the screen of FIG. FIG. As is apparent from this figure, the data of the horizontal scanning line numbers 2 and 3 are continuously displayed in the frame memory 10 five times in total in the first and second fields. Further, in the frame memory 10, the data of the horizontal scanning line number 4 is continuously displayed four times including the first field and the second field. Therefore, the data of the horizontal scanning line numbers 2 and 3 in the frame memory 10 is 5/4 compared to the data of the horizontal scanning line number 4 in the frame memory 10.
= 1.25 times emphasized and displayed. The data of the other horizontal scanning line numbers in the frame memory 10 are the same as the horizontal scanning numbers 2 to 4 described above. However, in the interlaced scanning method of the PAL system shown in FIGS. 2 and 4, the degree of emphasis is 6/4 = 1.5, so the interlacing of the PAL system shown in FIGS. 3 and 5 is performed. The scanning method is (1.5-1
) / (1.25-1) = 2 times better.

The method of reading the data of each horizontal scanning line number in the frame memory 10 by applying the present invention to the interlaced scanning system of the PAL system so as to obtain the same effect in the homogeneity of the image is shown in FIG. In addition to the method shown in (a), there is a method shown in FIGS.

The embodiment in which the present invention is applied to the infrared thermal imager having the camera head of FIG. 6 for generating a two-dimensional thermal image by mechanical scanning has been described above.
The present invention can be applied to any infrared thermal imaging device in which a two-dimensional thermal image is stored in the frame memory, and can be implemented regardless of the method of generating the two-dimensional thermal image in the camera head of the infrared thermal imaging device. Therefore, the detector 7 in the camera head of FIG. 6 is a two-dimensional infrared detecting element, and the present invention can be applied to an infrared thermal imager without a mechanical scanning system.

[0043]

As described above in detail with reference to the embodiments, according to the method and apparatus of the present invention, a common camera can be used regardless of whether the image display system of the TV monitor is the NTSC system or the PAL system. It is possible to provide an infrared thermal image display method and device capable of displaying a thermal image on almost the entire area of the screen of the TV monitor by using a head. Further, according to the method and apparatus of the present invention, the number of horizontal scanning lines in the thermal image recorded in the frame memory is N depending on the image display system of the TV monitor 12.
Since the number is a fixed number M regardless of whether it is the TSC system or the PAL system, the thermal image data recorded in the frame memory is analyzed by one type of software that does not need to be changed depending on the image display system of the TV monitor. You can

Further, when the present invention is applied to display a thermal image by the interlaced scanning method of the PAL system, only the data relating to a specific scanning line is emphasized among the thermal image data acquired by the camera head of the infrared thermal imaging device. It is possible to provide an infrared thermal image display method and apparatus that minimizes the degree of occurrence and maintains homogeneity in image display.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing horizontal scanning lines in a TV monitor that displays a thermal image by an infrared thermal image display method that is an embodiment of the present invention.

2 is a view showing the infrared thermal image display method of the embodiment of FIG.
It is a figure which shows typically the screen of the TV monitor 12 when it applies to the interlaced scanning system of a system.

FIG. 3 schematically illustrates a screen when a thermal image is displayed on the TV monitor 12 by the PAL interlaced scanning method in order to explain the embodiments of the invention described in claims 5 and 6. It is a figure.

FIG. 4 is a diagram showing that the horizontal scanning line numbers related to the thermal image data stored in the frame memory 10 are divided into a first field and a second field in the order in which they are displayed on the screen of FIG. is there.

5 is a diagram showing the order in which the horizontal scanning line numbers in the thermal image data stored in the frame memory 10 are displayed on the screen of FIG. 3 divided into a first field and a second field and arranged in chronological order ( (a) and the figure which shows the display order of the horizontal scanning line water line in the other method which produces the same effect (b)-.
(F).

FIG. 6 is a schematic configuration diagram of a camera head of the infrared thermal imaging device.

FIG. 7 is a configuration diagram showing an infrared thermal image display device in the infrared thermal image device.

[Explanation of symbols]

 1 ... Silicon window 2, 5 ... Reflector 3 ... Galvanometer 4 ... Rotating mirror 6 ... Focusing lens 7 ... Detector 8 ... Preamplifier 9 ... A / D converter 10 ... Frame memory 11 ... D / A converter 12 ... TV monitor 107, 108 , 111 ... Analog thermal image signal 109 ... Digital thermal image signal

Claims (6)

[Claims] 1. An infrared thermal image composed of image data of M horizontal scanning lines is stored in a frame memory, and image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is read out a plurality of times. By displaying the image data of each horizontal scanning line read from the frame memory as image data of each horizontal scanning line on the display screen of the television monitor in the order of reading, N (N>
M) In the infrared thermal image display method for displaying an infrared thermal image composed of image data of horizontal scanning lines on the display screen, N / M is r1 when the image display system of the television monitor is the NTSC system, and An infrared thermal image display method, characterized in that when N / M is r2 when the image display system of the television monitor is the PAL display system, r1: r2 is approximately 6: 7. 2. An infrared thermal image consisting of image data of M horizontal scanning lines is stored in a frame memory, and image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is p times (p times). Is an integer of 2 or more), and the image data of each horizontal scanning line read from the frame memory is displayed in the order of reading as image data of each horizontal scanning line on the display screen of the television monitor. In an infrared thermal image display method of displaying an infrared thermal image composed of image data of horizontal scanning lines of a book (N> M) on the display screen, p is set to p1 when the image display system of the television monitor is the NTSC system. When p is p2 when the image display system of the television monitor is the PAL display system, p1 is always 2, and p2 is 2, 2, 3 A method for displaying an infrared thermal image, characterized by being repeated. 3. An infrared thermal image composed of image data of M horizontal scanning lines is stored in a frame memory, and image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is read out a plurality of times. By displaying the image data of each horizontal scanning line read from the frame memory as image data of each horizontal scanning line on the display screen of the television monitor in the order of reading, N (N>
In an infrared thermal image display device for displaying an infrared thermal image consisting of image data of horizontal scanning lines of M) on the display screen, it indicates whether the image display system of the television monitor is the NTSC system or the PAL display system. The frame memory is provided with a unit for inputting TV monitor image display system information, wherein N / M when the TV monitor image display system information represents the NTSC system is r1, and the TV monitor image display system information is the PAL system. When N / M is expressed as r2, r1: r2 is approximately 6: 7.
An infrared thermal image display device characterized by the following. 4. An infrared thermal image composed of image data of M horizontal scanning lines is stored in a frame memory, and image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is p times (p times). Is an integer of 2 or more), and the image data of each horizontal scanning line read from the frame memory is displayed in the order of reading as image data of each horizontal scanning line on the display screen of the television monitor. In an infrared thermal image display device for displaying an infrared thermal image composed of image data of horizontal scanning lines of a book (N> M) on the display screen, the image display system of the television monitor is NTSC system or PAL display system. A means for inputting TV monitor image display system information indicating whether there is a TV monitor image display system information, and the frame memory stores the TV monitor image display system information. The p when representing the TSC method as p1, the television monitor image display method information when said p to p2 when representing the PAL system, and always two of p1, p2
The infrared thermal image display device is characterized by repeating 2, 2, and 3. 5. An infrared thermal image composed of image data of M horizontal scanning lines is stored in a frame memory, and image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is p times (p times). Is an integer of 1 or more), and the image data of each horizontal scanning line read from the frame memory is displayed in the order of reading as image data of each horizontal scanning line on the display screen of the television monitor, thereby jumping. An infrared thermal image composed of image data of N (N> M) horizontal scanning lines scanned by the scanning system is displayed on the display screen, and the p when the image display system of the television monitor is the NTSC system is displayed. p1 and p2 when the image display system of the television monitor is the PAL display system, p1 is always 2, and p2 is 2, 2, or 3. A repeated infrared thermal image display method, wherein P2 = in the first field of the interlaced scanning
The earliest of the three consecutive horizontal scanning lines corresponding to 3 becomes the last of the three consecutive horizontal scanning lines corresponding to P2 = 3 in the second field of the interlaced scanning. It is subsequently displayed adjacently, or in the second field of the interlaced scan, the P2 = 3.
The earliest of the three continuous horizontal scanning lines corresponding to P is P in the first field of the interlaced scanning.
An infrared thermal image display method characterized in that the last of the three horizontal scanning lines corresponding to 2 = 3 is displayed next to the last one. 6. An infrared thermal image consisting of image data of M horizontal scanning lines is stored in a frame memory, and image data of each horizontal scanning line in the infrared thermal image stored in the frame memory is p times (p times). Is an integer of 1 or more), and the image data of each horizontal scanning line read from the frame memory is displayed in the order of reading as image data of each horizontal scanning line on the display screen of the television monitor, thereby jumping. An infrared thermal image consisting of image data of N (N> M) horizontal scanning lines scanned by the scanning system is displayed on the display screen, and the image display system of the television monitor is the NTSC system or the PAL display system. Means for inputting TV monitor image display system information indicating whether the TV monitor image display system information is N or more. The p when representing the SC method as p1, the television monitor image display method information when said p to p2 when representing the PAL system, and always two of p1, p2
In the first field of the interlaced scanning, P2 =
The earliest of the three consecutive horizontal scanning lines corresponding to 3 becomes the last of the three consecutive horizontal scanning lines corresponding to P2 = 3 in the second field of the interlaced scanning. It is subsequently displayed adjacently, or in the second field of the interlaced scan, the P2 = 3.
The earliest of the three continuous horizontal scanning lines corresponding to P is P in the first field of the interlaced scanning.
An infrared thermal image display device characterized in that it is displayed adjacent to the last one of three continuous horizontal scanning lines corresponding to 2 = 3.