JPS6236394Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an infrared image color display device that converts a digitized signal from an infrared image device into an arbitrary color display code and then displays an image using analog three primary color signals.

Conventionally, there are two methods for displaying a temperature pattern using an infrared imaging device: black and white display and color display in which the temperature gradation is displayed in color. Among these, as a color display method, as shown in FIG. 1, an analog signal from an infrared device 1 for black and white display is supplied to an analog scan converter 2 and converted into a TV signal. The signals are applied to an amplitude discrimination circuit 3, and each amplitude is converted into a digital color signal corresponding to the gradation of the displayed color. This digital color signal is converted into an R, G, B encoder 4, that is, an analog R, G, B three primary color signal.
Displayed on color TV5 through A converter. In this case, analog scan converter 2 and color
A synchronization signal is given to the TV 5 by a TV synchronization signal generator 6. Normally, in the case of this infrared imaging device 1, point scanning is performed at a relatively slow speed to detect, for example, a temperature pattern on a human body surface. Therefore, the analog scan converter 2 also uses a memory tube or the like. However, since the memory tube has a shading characteristic and a characteristic of attenuation over time, there is a drawback that the color display data obtained by the next-stage amplitude discrimination circuit 3 changes during one screen scan.

On the other hand, in Japanese Patent Application No. 53-104569, the present applicant
The analog signal of the temperature at each point in the temperature pattern from the infrared camera is quantized and converted into a digital signal.
Digitally storing the temperature pattern ensures that the temperature values obtained at each point from a single optical scan do not change when read out multiple times in response to high-speed scanning for display. We proposed a digital infrared imaging device that converts the digital signal into an analog signal and supplies it as a brightness modulation signal of a black and white image to display a black and white image, and was able to obtain a highly accurate black and white pattern corresponding to temperature. Therefore, it is conceivable to use this digitized black and white digital signal for color display.

An object of the present invention is to provide an infrared image color display device with a simple configuration that displays temperature gradations in colors using a digitalized infrared image device.

To achieve the above object, the infrared image color display device of the present invention quantizes an analog signal obtained by point scanning at a relatively slow speed with an infrared camera, converts it into a digital signal representing temperature, and stores the digital signal.
It has an infrared imaging device that sequentially reads out the stored digital values and supplies them as a luminance modulation signal of a monochrome image for display in black and white, and branches the digital signal supplied as the luminance modulation signal of the monochrome image and addresses the digital signal. The device is characterized by comprising a read-only memory for reading out a color display code signal, and a D/A conversion circuit for converting the color display code signal into analog three primary color signals.

The present invention will be described in detail below with reference to examples.

FIG. 2 is a schematic diagram of an embodiment of the present invention.
In the figure, the digitized infrared imaging device 10 has an image display that has already been digitized as described above, and inputs the black and white digital signal as an address to a code conversion circuit 11 consisting of a read-only memory (ROM). A D/D/B encoder 12 that reads the color code corresponding to the gradation and converts it into the three primary colors of R, G, and B.
R, G, B signals through A converter to color TV5
for color display.

In addition, the digital infrared imaging device 10
A synchronization signal is given to TV5.

FIG. 3 is a detailed explanatory diagram of FIG. 2.

That is, a 6-bit black and white digital signal representing the temperature output from the digitized infrared imaging device 10 is applied as address data to a code conversion circuit 11 consisting of a ROM, and the ROM is read out. The ROM stores color code data in which temperature gradations correspond to R, G, and B colors. Code conversion circuit 1
1 distributes color code data corresponding to address data into the three primary colors of R, G, and B, and supplies them to R, G, and B color D/A conversion circuits 12 ₁ , 12 ₂ , and 12 ₃ . The shade of each color is represented by, for example, 2 bits. In this way, each D/A converter 12 ₁ , 12 ₂ ,
12 R color, G color converted to analog signal in ₃ ,
The B color signal is transmitted through each matching circuit 12' ₁ , 12' ₂ , 1
_2'3 , the impedance is converted, and the signals are sent out as R, G, B signals of the color TV 5. A synchronizing signal from the digital infrared imaging device is also sent to the color TV 5 via the matching circuit 10'.

As explained above, according to the present invention, since an infrared imaging device that has already been digitized is used, the digital signal can be used, so there is less need for additional circuitry, and it is not necessary to use a conventional memory tube. There are no defects, and a highly accurate temperature pattern can be obtained. Also converts to color display code signal.
Since the code conversion circuit is implemented using a ROM, control is easy and the configuration is simple, resulting in a low-cost color display device.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a schematic explanatory diagram showing the configuration of an embodiment of the present invention, and Fig. 3 is a detailed explanatory diagram of Fig. 2. In the figure, 5 is a color TV, 10
11 is a code conversion circuit, and 12 is an R, G, B encoder.

Claims (1)

[Scope of utility model registration request] An analog signal obtained by point scanning at a relatively slow speed with an infrared camera is quantized, converted into a digital signal representing temperature, and stored, and the stored digital values are sequentially read out as a brightness modulation signal of a black and white image. a read-only memory having an infrared imaging device for displaying black and white images, branching a digital signal supplied as a luminance modulation signal of the black and white image and reading out a color display code signal using the digital signal as an address, and the color display code signal. 1. An infrared image color display device comprising a D/A conversion circuit for converting a signal into an analog three primary color signal.