JPS6239737A - System for setting temperature range - Google Patents

Abstract

PURPOSE:To make it possible to automatically set an optimum temp. range, by detecting the max. and min. temps. of a temp. measuring region and imagewise displaying the temp. difference between both temps. as a temp. range. CONSTITUTION:A max. and min. temp. detection means, which consists of an area detection part 10 for detecting the imaged signal superposed to an inputted cursor and a max. and min. temp. detection part 11 for detecting the max. and min. temps. of the image signal outputted from the area detection part 10, is provided to an infrared imaging apparatus. The area detection part 10 reads the image signal superposed to the cursor from the image stored in an image memory 4 corresponding to an inputted position signal and the max. and min. temp. detection part 11 is constituted so as to detect the max. and min. temps. in the image signal by comparing said image signal with the prescribed temp. value preset to data registers 11-3, 11-4 by comparators 11-1, 11-2 and sends both temps. to a range operation part 5 and the temp. difference value of both temps. is used as a temp. range to set image brightness gradation which is, in turn, displayed.

Description

[Detailed Description of the Invention] [Summary] This is a temperature range setting method for an infrared imaging device, in which a cursor (bright line) is superimposed on the image position on the displayed image where temperature measurement is desired, and the temperature range within the specified area is specified. The configuration is configured to detect the maximum and minimum temperatures and set the image brightness using the temperature difference value between the two temperatures as the temperature range, and by placing the cursor on any temperature measurement point, the optimal temperature range is automatically set. Since it can be configured, it enables more efficient measurement and highly accurate temperature measurement.

(Industrial Application Field) The present invention relates to a temperature range setting method for an infrared imaging device.
In particular, the present invention relates to a temperature range setting method for an infrared imaging device that enables highly accurate measurement of displayed images by automatically setting an optimal temperature range.

2. Description of the Related Art Infrared imaging devices are widely used as devices for displaying a temperature pattern of a subject and measuring the temperature in the pattern.

An infrared imaging device changes the brightness gradation according to the amount of infrared rays emitted from a subject, and displays the temperature pattern of the subject on a display.

The temperature of the display pattern is measured by visually measuring the brightness gradation of the display image or by measuring the temperature value displayed corresponding to the brightness gradation.

The width of change in brightness gradation (V) for highly accurate temperature measurement
The M degree range) is determined by the measurer by determining the optimum value in consideration of the temperature near the measurement point, which requires a lot of time for measurement.

Therefore, instead of setting the temperature range based on the judgment of the measurer,
There is a need for a temperature range setting method for an infrared imaging device that can automatically set the optimum temperature range and measure the displayed temperature pattern with high precision.

[Conventional technology]

FIG. 4 is a block diagram of a conventional temperature range setting method.

In FIG. 4, infrared rays emitted from a subject 1 are captured by an infrared camera section 2 and converted into electrical signals.

The electrical signal converted by the camera section 2 is converted into a digital signal by the A/D converter 3, and is transferred to the video memory 4 in synchronization with the scanning of the camera section 2 by a write control signal from the memory control section 8.
is stored at a predetermined address.

The video memory 4 outputs the image signal of the object stored for each screen according to the read control signal from the memory control section 8 to the D/A converter 6 via the range calculation section 5.

The D/A converter 6 converts the digital image signal output from the video memory 4 into an analog signal, and displays the image on the display 7 for each screen.

To set the temperature range, the measurer switches the temperature range switch 9-1 provided in the range setting device 9 to a predetermined temperature range.

Now, for example, if the temperature range selector 9-1 is set to the 10° range, the range setting device 9 will set the specified maximum temperature, for example 40°, which is the difference between 50°C and the temperature range of 10°C.
temperature control signals A and B corresponding to °C are generated and output to the range calculation section 5.

The range calculation unit 5 performs calculations to convert the image digital signal output from the video memory 4 into brightness gradations corresponding to the temperature control signals A and H, and displays the brightness gradations in the temperature width of the 0°C range on the display unit 7. Display the image on.

[Problem that the invention seeks to solve]

In this conventional method, the temperature range is set by the measurer, and because the setting is based on intuition, in which the temperature range is judged from the displayed image, it takes time to set the optimal range, and there are problems such as poor measurement efficiency. Ta.

The present invention was created in view of these points, and an object of the present invention is to provide a temperature range setting method for an infrared imaging device that can automatically set an optimal temperature range with a simple configuration.

[Means for solving problems]

FIG. 1 shows a block diagram of an infrared imaging device of the present invention,
A conventional infrared imaging device is equipped with maximum and minimum temperature detection means.

The maximum and minimum temperature detection means inputs a cursor position signal specifying the display image position and detects an image signal that overlaps with the cursor, and an area detection unit 10 that detects the maximum temperature of the image signal output from the area detection unit 10. and a maximum and minimum temperature detecting section 11 for detecting the minimum temperature, and the temperature difference value between the maximum temperature and the minimum temperature is displayed as an image as a temperature range.

[Effect]

The temperature measurement position on the display image is set by superimposing a bright line (cursor) on the temperature measurement position on the display screen, and as the cursor measurement position is set, a position signal representing the cursor position on the display is created. and outputs it to the area detection section 10.

The area detection unit 10 detects the image signal of the area overlapped with the cursor from the input position signal, and the maximum and minimum temperature detection unit 11 detects the maximum and minimum temperatures of the image signal of the area overlapped with the cursor. It is detected and output to the range calculation section 5.

The range calculation unit 5 converts the brightness tone of the image signal for each screen outputted from the video memory 4 so as to set it to the temperature range (temperature range) of the temperature difference value between the maximum temperature and the minimum temperature and display it. , and displayed on the display 7 via the D/A converter 6.

In the present invention, the maximum and minimum temperatures of the image signal in the area superimposed on the cursor that defines the measurement position are detected, and the difference between the two temperatures is displayed as a temperature range, thereby automatically setting the temperature range. , the optimum temperature range can be obtained and highly accurate temperature measurement is possible.

〔Example〕

Fig. 1 is a block diagram of an infrared imaging device according to an embodiment of the present invention, Fig. 2 is a block diagram of a maximum and minimum temperature detection section of the embodiment, and Fig. 3 is an operation of the maximum and minimum temperature detection means of the embodiment. It is an explanatory diagram.

In FIG. 1, an area detection unit 10 receives a cursor position signal specifying the display image position and detects an image signal that overlaps with the cursor in order to automatically set the optimum temperature range; The infrared imaging device is provided with maximum and minimum temperature detection means consisting of a maximum and minimum temperature detection section 11 for detecting the maximum and minimum temperatures of the image signal to be output.

Infrared rays emitted from the subject 1 are captured by scanning by the camera section 2 and converted into electrical signals. This converted electrical signal is converted into a digital signal by the A/D converter 3, and is stored at a predetermined address in the video memory 4 in synchronization with the scanning of the camera unit 2 by a write control signal from the memory control unit 8. °.

The digital signal stored in the video memory 4 is outputted to the D/A converter 6 via the range calculation unit 5 as an image signal for each screen according to the readout control signal of the memory control unit 8.
The signal is converted into an analog signal by the D/A converter 6 and displayed as an image on the display section 7.

As shown in the explanatory diagram of FIG. 3, when measuring the temperature of the finger of the left hand displayed on the display 7, a cursor (bright line) 7-2 is superimposed on the finger position Al of the display image 7-1. . Using this cursor 7-2, a position signal corresponding to the cursor position ^2 on the display 7 is created and output to the area detection section 10.

The area detection section 10 sequentially outputs image signals superimposed on the cursor from among the image signals stored in the video memory 4 in response to the input position signal, and outputs them to the maximum and minimum temperature detection sections 11.

As shown in the block diagram of FIG. 2, the maximum and minimum temperature detection section 11 includes a comparator 11-1 and a data register 11-3, and a comparator 11-2 and a data register 11-4, which are connected in series. It consists of

In this operation, a specified temperature value B is set in advance in the data registers 11-3 and 11-4. Comparators 11-1 and 11-2 use the specified temperature value B set in each data register.
The image signals superimposed on the cursor sequentially output from the video memory 4 are compared with the temperature value of A in FIG. 3 (bl).

Now, in the comparator 11-1, if A>B, the contents of the data register 11-3 are rewritten to A.

If this is done for all input image signals, the maximum temperature H-T (in FIG. 3) of the image signals can be obtained (38 DEG C.).

Further, by detecting A<B in the comparator 11-2 and thereafter performing the same procedure as described above, the lowest temperature LT (lowest temperature 28 DEG C. in FIG. 3) can be obtained.

The maximum temperature HT (38°C) and minimum temperature LT (28°C) obtained in this way are input to the range calculation section 5, where they are output from the video memory section 4. The image is displayed by setting the brightness gradation of the image signal for each screen to a width of 10°C, which is the temperature difference value between the maximum temperature and the minimum temperature.

〔Effect of the invention〕

As explained above, according to the present invention, the maximum temperature and minimum temperature of the temperature measurement area are detected, and the temperature difference value between the two temperatures is set and displayed as the temperature range, thereby automatically , and the optimum temperature range can be set, making measurement work more efficient and enabling highly accurate temperature measurement.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an infrared imaging device according to an embodiment of the present invention, FIG. 2 is a block diagram of a maximum and minimum temperature detection section of the embodiment, and FIG. 3 is an explanatory diagram of the operation of an embodiment of the present invention. FIG. 4 is a block diagram of a conventional infrared imaging device. In the figure, 1 is the subject, 2 is the camera unit, 3 is the A/D converter, 4 is the video memory, 5 is the range calculation unit, and 6 is the D/A
Converter, 7 is a display, 7-1 is a display image, 7-2 is a cursor, 8 is a memory control unit, 9 is a range setting device, 9-1 is a temperature range switch, 10 is an area detection unit, il is a Maximum and minimum temperature detection section, 11-1.11-2 is comparator, 11-3
．． 11-4 indicate data registers, respectively. Δ4 do 呵 angle - missing) as an example of outside Ki D unf elephant 4ur for 7”D
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Claims (1)

[Claims] In an infrared imaging device that displays an infrared image of a subject (1) in a predetermined temperature range, maximum and minimum temperature detection means (10 , 11), and the infrared image is displayed using the difference value between the maximum temperature and the minimum temperature of the detection means (10, 11) as the temperature range.