JPS60153089A - Digital multicolor converter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field to Which the Invention Pertains] This invention is capable of creating a parallel digital signal of multiple bits representing color information using the multiple bits. This invention relates to a digital multicolor conversion device that converts the signal into a multicolor digital signal and outputs the converted signal.

[Prior art and its problems]

For example, a home video camera is a single-tube camera that extracts six primary color signals of red, green, and blue (RGB) from a single image pickup tube, performs signal processing to display them on a color TV, and outputs them. It can be said that it is the source of image information.

When a color image is displayed by inputting RGB three primary color signals (3-bit parallel digital signals with one bit assigned to each color) from such a color image information source to a color monitor TV, the number of displayed colors is , three primary color signals (6
There were only 23-8 combinations of bits.

For this reason, even if an attempt was made to faithfully reproduce the hues of the original object as a displayed color image, it would be difficult to achieve this if only eight colors were used. there were.

Analog monitor color TVs are also known, which convert three primary color digital signals into analog signals using a D/A converter, obtain analog signals of various levels, and reproduce detailed hues by combining them. However, in this case, a D/A converter is required for the number of bits, and the cost is high.

[Purpose of the invention]

The present invention was made in view of the above-mentioned conventional technical circumstances, and an object of the present invention is to digitally process digital signals representing the three primary colors without requiring a D/A converter. The object of the present invention is to provide a low-cost digital multicolor conversion device that creates multicolor digital signals that enable far more than eight combinations of multicolors.

In other words, by passing the digital three primary color signals through this conversion device and inputting them to the color monitor TV as multicolor digital signals, it is possible to combine far more than eight colors, making it possible to display images with finely detailed hues. This is the result.

[Key points of the invention]

The gist of the invention is to include a plurality of delay circuits that receive a plurality of parallel digital signals representing color information and output a predetermined delay to each bit; and a logic circuit that performs a logical operation between digital signals and outputs the result of the operation as a multicolor digital signal, and the multicolor digital signal generates color information in an amount greater than the amount of color information that can be created by the plurality of bits. The point is that it made it possible to create.

[Embodiments of the invention]

The present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 1 is a color image information generation source, 2 is a digital multicolor conversion device according to the present invention, 20 to 28 are delay lines, 29 is a gate selector, and 3 is a color monitor TV.

FIG. 2 is a waveform diagram showing an example of the waveforms of the input signal and output signal of the conversion device 2 in FIG. 1.

That is, in FIG. 2, the three primary color input signals R1pGl
, Bl, the three primary color output signals Rs j G5 p B
As is clear from comparing 5.
It will be seen that the input and output signals differ in pulse width and phase.

Since the input signals R1p G1 p B1 have fixed pulse widths and phases, only eight combinations can be obtained, as described above. However, since the pulse width of the output 'N' Rs y G s p B s is variable, the number of combinations becomes enormous depending on how many pulse widths can be selected. By individually changing the pulse width of the signal pulses, the combination of the three primary color signals has different light emission times, so it is possible to express various hues. Changing not only the pulse width but also the pulse phase causes subtle changes in the color tone.

If the selection of pulse width and phase is taken into consideration, it will be understood that the combinations of the three primary color signals R5y G53 B S obtained as output signals are extremely large, and various hues can be subtly reproduced.

Selection of the pulse width and phase is arbitrarily performed in the gate selector 29 according to a control command given from the outside.

Next, the circuit operation of the gate selector 29 will be explained with reference to FIG.

Please refer to FIGS. 1 and 6. Let us now consider the primary color signal R. The primary color signal R1 from the source 1 is subjected to a predetermined delay by passing through the delay 2 ins 20, 21, and 22 (assuming that the amount of delay of each delay line is the same), and then becomes R2°R3y R4. The signal is input to the gate selector 29 as follows.

In the gate selector 29, according to an external control command, R
If the logical product of the on level of R2, the on level of R3, and the off level of R4 is created and output, R5 is obtained.

That is, the delay amount of each delay line is appropriately selected, and furthermore, by an external control command, R2゜R3p R4
It should be understood that a primary color signal R5 having an arbitrary pulse width and an arbitrary phase can be created by selecting the ON or OFF level and creating the logical product. The same holds true for primary color signals B and G.

From the above, it will be understood that the gate selector 29 can be easily and appropriately configured using a plurality of AND circuits.

In the embodiment of the present invention shown in FIG. 1, the input signal R1t Gly Bl and the output signal R5p
Although it is assumed that the number of G5 p B 5 is the same, 6 each, it is readily apparent that the numbers can be different from each other.

〔Effect of the invention〕

According to this invention, it is possible to display a color image in far more than eight colors on a digital color monitor TV, and it is advantageous to be able to faithfully reproduce the hue of the original object at a low cost. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a waveform diagram showing an example of waveforms of the input signal and output signal of the conversion device 2 in FIG. 1, and FIG. Explanation of circuit operation of selector 29 Code explanation 1...Color image information generation source, 2...
Digital multicolor conversion device, 2o~28... Delay line, 3... Color monitor TV Agent Patent attorney Akio Namiki Attorney Patent attorney Mizozuki Matsuzaki 1 Figure

Claims (1)

[Claims] 1) between a plurality of delay circuits that receive a plurality of parallel digital signals representing color information and output a predetermined delay for each bit, and each of the delayed digital signals according to an external control command; and a logic circuit that performs a logical operation on and outputs the operation result as a multicolor digital signal, and the multicolor digital signal makes it possible to create an amount of color information greater than the amount of color information that can be created using the plurality of bits. A digital multicolor conversion device characterized by: