JPS6363153B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pseudo color display device for image signals, which displays a monochrome image in pseudo color according to the luminance level of the monochrome image for image analysis.

In conventional pseudo-color display devices, a method has been used in which three primary colors, red (R), green (G), and blue (B), are controlled by the gray level of a monochrome image signal to display a color image. In this method, RGB
A monitor color television with an input function is required, and a control circuit is required to display any color at any black-and-white gray level, resulting in high cost and complicated operation. Also, as a simplified form, Japanese Patent Application No. 55-143341
In order to keep costs low, the method proposed in the issue uses a method that fixes the pseudo-color display color depending on the black-and-white shading level. It was not possible to switch the display color to display an arbitrary color for the level.

The purpose of the present invention is to eliminate these drawbacks, display black-and-white images in pseudo-color using a commercially available color television, and provide an easy way to display black-and-white images or any color image corresponding to any black-and-white gray level by simply switching connections. Pseudo-color display, in which other black and white shading levels are displayed in black and white,
Furthermore, it is an object of the present invention to provide a pseudo-color display device capable of displaying a pseudo-color display in which any color is displayed depending on the overall black-and-white gray level.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the invention.
In the figure, 1 is an analog-to-digital (A/D) converter,
2 is a microcomputer, 3 is a TV synchronization signal generation circuit, 4 is a logic circuit, 5 is a data storage circuit,
6 is a digital-to-analog (D/A) conversion circuit, 9 is a phase shift circuit, 7 is an encoder, 8 is a gate circuit, 1
0 is a switch circuit, 11 is a switch circuit, 12 is a synthesis circuit, 20 is a TV signal input terminal, and 21 is a signal output terminal.

In this operation, first, a signal converted into a digital signal by an A/D conversion circuit 1 is sent to a microcomputer 2.
It is assumed that the data is stored in the data storage circuit 5 under control. On the other hand, the control signal A output from the television synchronization signal generation circuit 3 is input to the logic circuit 4, which outputs the data call control signal B, and by this signal B, the image data stored in the data storage circuit 5 is called. The called image signal C is a parallel BCD digital signal having black and white gray level information, one of which is input to the D/A conversion circuit 6 and a luminance signal D is output. Also, the TV synchronization signal generation circuit 3
The color subcarrier signal E output from
A seed color subcarrier signal F is output. Also,
One of the image signals C is inputted to the encoder 7, becomes a parallel digital signal G, and is inputted as a color control signal H to the gate circuit 10 through an operation switch 8 that sets predetermined conditions. This gate circuit 10 is a circuit that selects any one of the n signals of the color subcarrier signal F and outputs it to the synthesis circuit 12, and which one is selected depends on the color control signal H. be. The other gate circuit 11 converts the color subcarrier signal I, which is one of the n+1 color subcarrier signals output from the phase shift circuit 9, into a color burst flag J output from the television synchronization signal generation circuit 3. This is a circuit that controls and outputs color burst L. Further, the synchronization signal K, color burst L, luminance signal D output from the television synchronization signal generation circuit 3, and the color subcarrier signal output from the gate circuit 10 are input to the synthesis circuit 12, and a composite television signal M is obtained.

Here, the color control signal H is output by the switch circuit 8.
If all of them are turned off, the color subcarrier signal will not be input to the combining circuit 12, and a monochrome image composite television signal M will be output, and if any color control signal H is connected, only the corresponding brightness level will be output. It is output as a pseudo-color composite television signal M. This composite television signal can be input to a commercially available television to display images.

As explained above, according to the present invention, depending on the connection state of the operation switch, a black and white image or an image with arbitrary pseudo colorization applied to any black and white density level can be displayed on a commercially available color television, and the operation It is a simple operation that requires only changing the connection status of the switch, and is cheaper than the conventional method using a monitor TV with RGB input.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1...A/D converter, 2...Microcomputer, 3...TV synchronization signal generation circuit, 4...Logic circuit, 5...Storage circuit, 6...
D/A conversion circuit, 7... Encoder, 8... Switch, 9... Phase shift circuit, 10, 11... Gate circuit, 12... Synthesis circuit, 20... Input terminal, 21
...This is an output terminal.

Claims (1)

[Claims] 1. An encoder that outputs a predetermined number of level values corresponding to black and white grayscale information of an image signal, a switch that selectively outputs one of the predetermined number of level values under set conditions, and a switch that outputs a phase state from a color subcarrier signal. a phase shift circuit that outputs a plurality of different color subcarrier signals; a gate circuit that selects and outputs one of the plurality of color subcarrier signals corresponding to the output of the switch; and a gate circuit that selects and outputs one of the plurality of color subcarrier signals corresponding to the output of the switch; A pseudo color display device for image signals, comprising: a circuit for outputting a luminance signal; and a synthesis circuit for synthesizing the luminance signal and the selected color subcarrier and supplying the synthesized signal to a color television receiver.