JPS6082823A - Color display apparatus of infrared ray picture - Google Patents

Abstract

PURPOSE:To make it possible to perform display which can be readily recognized in details, by controlling the relative luminace of a picture region at a plurality of steps in correspondence with the levels of image signals in a plurality of the steps. CONSTITUTION:The data for a temperature range of 48-56 deg.C is assigned to a conversion table memory 17R by a data assigning means 16 for red-color indication. At this time, the content of the RAM17R of an address corresponding to the lower 3 digits of the temperature data is read out. The read relative luminance data signal is converted into an analog signal, whose relative amplitude is changed in 8 steps, by a D/A converter 12R. The signal, whose amplitude is changed in 8 steps, is supplied to a display device 13. The R display region is displayed, with the relative luminance being changed at every 1 deg.C. The same operation is performed with respect to conversion memories 17G and 17B.

Description

[Detailed description of the invention] The present invention relates to an infrared image color display device.

Conventionally, so-called thermography devices have been known that optically scan and detect infrared rays emitted from an object to be examined, such as a human body, and display the temperature distribution on the surface of the object as an image on the surface of a cathode ray tube. It is being

First, a conventional thermography apparatus will be explained with reference to FIG.

In Fig. 1, infrared rays from a subject (1) such as a human body are two-dimensionally scanned by a scanning mirror (3) in a camera unit (2) at a scanning speed of, for example, 5 seconds/frame. The light is focused by an optical system (4), passes through a chopper (different type) (5), and enters an optical sensor (6). This optical sensor (6)
For example, an indium antimony (InSb) photoelectric conversion element, which has a fast response speed and high sensitivity, is used by cooling it with liquid nitrogen. The detection signal from the optical sensor f61 is sent to a preamplifier (
7) Linearity compensation circuit (linearizer) (8)
711. of the subject (1). The infrared radiation characteristic proportional to the four bundles of iL degrees is supplemented with a linear characteristic. Therefore, the voltage of the output analog signal from the correction circuit (8) is proportional to the temperature of the subject (11).

This analog signal is supplied to an analog/digital converter (hereinafter referred to as A/D converter) (9), and the A/D converter (9) outputs digital data of, for example, 6 bino 1 (64 levels) ( No. g is a frame member (10) and I myself 1
intended. The digital data signal recorded in the frame memory 00) is read out at the same rate as a normal television image at, for example, 30 frames/second, and converted into a desired display mode (details will be described later) by the display mode switching device (11). ), the digital/analog converter (hereinafter referred to as D/A converter) (12) converts it into an analog signal and supplies it to the display device (13), where it is displayed on the cathode ray tube surface. Displayed as a still image above.

The above-mentioned display modes include black and white display, black and white inverted display, 1 isotherm display, N-like color display, etc., and each signal processing circuit (lla) of the display mode switching device (11) can be selected depending on the subject and observation purpose. ~(lln) as switch (II
s ) to select the display mode.

In the case of black and white display, the brightness of the displayed image is controlled according to the magnitude of the input analog signal level of the display device (13), and a reference brightness bar (so-called gray gale) from white to black corresponding to the display temperature range is controlled. Mark 1 on the right edge of the same cathode ray tube surface.

Further, in the case of black and white inverted display, processing is performed to remove the one's complement of the digital data read from the frame memory α0), and the output polarity of the D/A converter (12) is inverted.

In the case of isothermal line display, a digital comparator outputs digital data signals corresponding to the same brightness level. In this case, the display temperature range should be set to 5, for example.
Divide into equal parts and display four fixed isotherms every 20%. It is also possible to select and display isotherms of arbitrary temperatures within the display range.

In the case of pseudo-color display, the degree range of the °ζ table is divided into multiple stages (for example, 8 stages) using the digital window comparator, and a different color is assigned to each stage.
In addition to displaying a multicolor image, a reference color bar is also displayed on the edge of the same cathode ray tube surface.

That is, for example, as shown in Figure 2, 21+
! Divide the degree range into 8 equal parts, and add red (R), orange (0),
Six colors, yellow (Y), green (G), blue (13), and purple (M), are sequentially allocated. By assigning appropriate bits to R, G, and B when reading and outputting data from frame memory θ0 and displaying it in a ζ table, the sensor graph image can be displayed in color and the temperature of the subject can be directly read. be able to.

However, in such a display, since the number of color division areas is small, the temperature distribution along a certain scanning line (14) is changed to a curve (15).
), it is not possible to know the detailed temperature distribution within the same color area, even though it changes continuously. In this case, it is conceivable to significantly increase the number of color divided regions, but the number of colors becomes too large and the distribution pattern becomes finer and warped, making it difficult to grasp the temperature distribution. Therefore, continuous tone black and white images are more suitable for displaying detailed temperature distributions, but on the other hand, they are difficult to contrast with grayscale images, making it difficult to clearly and directly read the temperature distribution of the object. be.

In view of the above, the present invention aims to eliminate the drawbacks of conventional infrared image color display devices and to propose a device capable of displaying detailed and easily distinguishable infrared images in color.

Hereinafter, an embodiment of the infrared image color display device according to the present invention will be described with reference to FIGS. 3 and 4.

FIG. 3 shows the infrared rays according to the present invention! ! ! An example of an I-image color display device is shown. In this Fig. 3, the subject and camera section are the same as in Fig. 1, so the illustration is omitted, and
The same reference numerals are given to the parts corresponding to those in FIG.

In Figure 3, (16) is the means for data distribution, (17)
R), (17G) and (17B) are conversion table memories, respectively. Data distribution is means (16) C8 (
(7) It includes an f digital window comparator, and converts the digital data signal read from the frame memory 00) to
Conversion table memory corresponding to 3 colors G and B (17R
), (17G) and (17B > as appropriate. Conversion table memory (1711), (17G) and (
17B) is RAM (random ac) with the same configuration.
cessn+emory), and for example, as shown in FIG. 4, 8 words of relative luminance data of 4 bits per word are included. Each conversion table memory (17R), (1
The output data signals of (7G) and (17B) are sent to the corresponding D/A converters (12R)', (12G) and (1
2B), the signals are converted into R, c-, and B analog signals and supplied to the display device (13).

B: The operation of the embodiment is as follows. For example 48-5
Data for a temperature range of 6°C are shown in red for the
The data installation is distributed to the conversion table memory (1717) by means (16). In this case, the content of the RAM (17R) at the address corresponding to the -1 and 3 digits of the temperature data, that is, the relative brightness data (30 to 10
0%) is read. Conversion Chiful Memory (17R)
The relative luminance data signal read from the D/A converter (1
21? ), the relative amplitude is converted into an analog R signal whose relative amplitude changes in eight steps (one step per 1° C.) in the range of 30 to 100%. This R signal whose amplitude changes in 8 steps is supplied to the display device (13), and the R display area on the cathode ray tube surface has a relative brightness that varies by 1°C, for example, as shown in FIG. ζ is displayed.

Remaining conversion table memory (17G) and (17B)
Since it is exactly the same as memory (17R),
Regarding this, illustration and explanation of °ζ will be omitted.

Thus, in this example, the three primary colors R, C, and B are used.

In intermediate colors and achromatic colors such as W and Bk, the colors within each color area are displayed with a relative brightness change of 1°C, allowing direct reading of the 7h11 degree distribution in much more detail and easier identification than in the conventional example. Things happen.

- In the actual fijε example described above, both the display temperature range and the relative brightness range were set to 8 levels, but these
, and the configuration can be changed in various ways. For example, only one conversion table memory may be used and 64 words of conversion data may be written corresponding to each of the 6 bits of temperature data. However, if this is done, the memory capacity will increase and the price will decrease by -1.

J=, ii'l': As described above, according to the present invention,
Since a relative brightness change is applied to each of the same color areas of the pseudo-color display image, it is possible to obtain a device that can display an infrared image in color in 6'6 fine detail and easy to identify.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a configuration example of a conventional infrared image color display device, FIG. 2 is a line diagram for explaining the device shown in FIG. 1, and FIG. 3 is an infrared image color display device according to the present invention. FIG. 4 is a conceptual diagram of the essential parts of the embodiment shown in FIG. 3, and FIG. 5 is a diagram for explaining the present invention. (214;, l: force part, (101 is the frame e, (II) is the display mode switching device, (13) is the display device, (17) is the conversion table memory.

Claims (1)

[Claims] an imaging means for two-dimensionally scanning and detecting infrared radiation from the object to obtain a video signal; and dividing the level of the movie image signal from the imaging means into a plurality of levels for each predetermined level; - a temperature distribution of the object; In an infrared image color display device having an image display means for displaying image areas corresponding to the plurality of stages in different hues according to the plurality of stages, the relative brightness of the image area according to the level of the video signal within the plurality of stages as described in 2. An infrared image color display device comprising a brightness control means for controlling brightness in multiple stages.