JPH02135392A - Picture processor - Google Patents

Abstract

PURPOSE:To readily display the gradation of monochrome into a monochrome display unit corresponding to colors by providing a second look-up table whose address should be each output of a first color look-up table. CONSTITUTION:The outputted data of the look-up table 25 are latched into the latches 26-28 of R, G, and B by a multiplexer 26. The data of these R, G, and B are DA-converted by DACs 29-31, and outputted from output terminals 32-34 as the R, G, and B signals of analog. Mean while, the outputs 35-37 of the latches 26-28 are inputted as addresses of the look-up table 40 and become the output 41 of the look-up table 40 by reading the data of specified addresses. Thus, optional monochrome gradation data corresponding to the data of R, G and B can be obtained and monochrome gradation can be displayed which is proper to the display characteristics of the monochrome display unit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image processing apparatus for processing color images in a personal computer or the like.

2. Description of the Related Art In recent years, color palette LSIs that can display a large number of colors simultaneously have come into use on the display screens of personal computers.

The conventional color palette will be explained below.

FIG. 2 is a block diagram of the data processing section of a conventional color palette, where 1 is a data input terminal, 2 is a data latch, 3 is an address input terminal, 4 is an address latch, and 5 is a color lookup terminal. Tables 6 and 7.8 are red (R), green (G), and blue (B) data clutches, respectively, and 9 and 10.11 are the above R, G, and
Inverters 12, 13, and 14 for each data month data are R, G, and B analog output terminals, respectively.

The operation of the color palette configured as described above will be explained below.

First, writing of data into the color lookup table 5 will be explained. 8-bit configuration address input terminal 3
The data input from the 8-bit data input terminal 1 is written to the address of the color lookup table 5 specified by (.Next, reading the data will be explained. The contents of the address of the lookup table 5 are output in, for example, 12 bits, and are latched as 4-bit data in each of R, G, and B latches 6.7.8.Latch 6.7
．． Each 4-bit digital output of 8 is connected to a DA converter 9,
10.11, and the R, G, and B analog outputs are converted to analog output terminals 12 and 1, respectively.
Output from 3.14. These analog outputs are C
It is input as RT R, G, and B signals, and a color image is displayed on the CRT screen.

Problems to be Solved by the Invention However, with the above conventional configuration, it is not possible to display monochrome gradations corresponding to color data on monochrome displays such as liquid crystal displays and plasma displays. There has been an inconvenience that images cannot be displayed on the display.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a color palette that can display monochrome gradations even on monochrome displays such as liquid crystal displays and plasma displays.

Means for Solving the Problem To achieve this objective, the color palette of the present invention is
It has a configuration in which monochrome gradation data is generated and output using a second color lookup table that receives the digital output of a conventional color lookup table.

Effect: With this configuration, a monochrome image having gradations corresponding to color display can be displayed on a monochrome display.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a color palette in one embodiment of the present invention. In FIG. 1, 21 is a data input terminal, 22 is a data latch, 23 is an address input terminal, 24 is an address latch, 25 is a color lookup table, 26, 27, and 28 are red (R), respectively. Green (G) and blue (B) data latches, 29.30.31 are DA converters for the above R, G, and B data, respectively, 32, 33.34 are R, respectively.
, G, and B, and these have the same configuration as the conventional example. 35, 36°37 are R respectively
, G, and B data buses, 38 is a monochrome data input terminal, 39 is a latch, 40 is a second color look-up table, and 41 is a data output terminal for monochrome gradation display.

The operation of the color palette of this embodiment configured as described above will be described below.

First, a case in which data is corrupted into the lookup table 25 will be explained. Latch 2 from address input terminal 23
The address of the lookup table 25 is specified via 4. The data input terminal 21 is connected to this specified address.
Data is written from there through the latch 22. Thereafter, data is sequentially written into the lookup table 25 in the same manner.

Next, a case in which data is written to the lookup table 40 will be explained. Latch 2 from address input terminal 23
4, the address of the lookup table 25 is specified, and the data at that address is read out. This data specifies the address of lookup table 40 via latches 26, 27, and 28. The data from the data input terminal 38 is latched into the specified address by the latch 39.
, and written as data in table 40. Thereafter, data is sequentially written into the lookup table 40 in the same manner.

To read out the lookup table 25, the address of the lookup table 25 is specified from the address input terminal 23 via the latch 24, and data at the specified address is read out. The output data of the lookup table 25 is latched by the multiplexer 26 into R, G, and B latches 26°, 27, and 28, respectively. This R, G, B
The data is DA-converted by DACs 29, 30, and 31, and output as analog R, G, and B signals from analog output terminals 32, 33, and 34.

On the other hand, the outputs 35, 36° 37 of the latches 26, 27, and 28 are input as addresses of the lookup table 40, and the data at the specified address is read out and becomes the output 41 of the lookup table 40.

This output is data obtained by converting R, G, and B data 35, 36° 37 using a lookup table 40, and is used as monochrome gradation data. For example, if this output 41 is a 4-bit digital output,
Used as 16-level gradation display data.

By writing arbitrary data into the lookup table 40, arbitrary monochrome gradation data corresponding to R, G, and B data can be obtained, and a monochrome gradation display suitable for the display characteristics of a monochrome display device can be obtained. It is possible.

As described above, according to this embodiment, by using the output of the color lookup table as the address input of the second lookup table, arbitrary monochrome gradation display data corresponding to the color can be obtained. Images can be displayed on the display.

As a result, in the past, it was difficult to display application software for personal computers that had a color display function on a monochrome display, but according to the present invention, it is possible to display the application software on a monochrome display without changing the application software. , which has the advantage of being easily displayed on a monochrome display.

Effects of the Invention The present invention provides a second lookup table whose addresses are the red, green, and blue outputs of the first color lookup table, thereby displaying monochrome gradation display data corresponding to color display. It is possible to easily realize monochrome gradation display corresponding to color on a monochrome display.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an image processing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. 1.21...Data input terminal, 2,22...
...Data latch, 3, 23...Address input terminal, 4.24...Address latch, 5
,25...Color lookup table, 6,
26... Red data latch, 7, 27...
...Green data latch, 8.28...
・Blue data latch, 9.29...DA converter for red, 10°30...DA converter for green, 11°31...DA converter for blue , 12.32... Red analog output terminal, 13.33... Green analog output terminal, 14.34... Blue analog output terminal, 35... ...red data bus,
36... Green data bus, 37...
... Blue data bus, 38 ... Monochrome data input terminal, 39 ... Latch, 40 ...
...Second lookup table, 41...
...Data output terminal for monochrome gradation display.

Claims (1)

[Claims] The device includes an output of a digital color signal from a first color lookup table and a second color lookup table using this output as an address, and uses the output of the second color lookup table as a gradation display signal. An image processing device characterized by: