JPS58221561A - Data type converter for color picture - Google Patents

Abstract

PURPOSE:To perform a data conversion with a simple device and in a short time, by reading a series of color picture data out of color-based line buffers by switching either picture element sequential system or color-based sequential system. CONSTITUTION:A data conversion type showing rearrangement of data is designated by a control line 131. This data type is available in two modes: a picture element sequential read-out mode in which the data shown by the same addresses as RAMs 111-126 constituting color-based line buffers 146-149 and then transferred continuously in B, C, M and Y per one picture element; and a color- based sequential mode in which only the line bubber that is designated by a control line 132 among B, C, M and Y. The selection signal of the read data is generated from a decoder 133 on the basis of the data modes designated by control lines 131 and 132. Tristate buffers 134-137 select the data to be transferred by the selection signal generated from the decoder 133. The selected data is fetched to latches 142 and 143 and transferred via buffers 144 and 145.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a data format conversion method that rearranges data using a line baranoor that stores three-color or four-color print signals obtained by color-separating a color image original. Regarding equipment.

Conventionally, images are separated into colors and read using an image reading device.
Three primary color signals converted from analog to digital (in the case of subtractive color mixing, cyan C, magenta M).

In the case of yellow Y or additive color mixture, the color image data of red R1 green G, blue B) or four-color printing signals (black plate B, O, M, Y) is imported into a storage device such as a magnetic disk device by a computer. Rarely, it is taken out and used when necessary. For example, if it is necessary to process three primary color signals simultaneously or for each color depending on the target, dot-sequential, line-sequential, or screen-sequential processing (
For example, when converting from a color image in pixel data format to color image data for each color, data must be converted into pixel data format from a magnetic disk device. The color image data is read out, and software performs a process of extracting it by color. However, it has the disadvantage that it takes a lot of processing time to process huge color images.

The present invention provides a high-speed color image data conversion device that solves the above-mentioned drawbacks. An embodiment of the present invention will be described in detail below with reference to the drawings. 3 to be input
Color input signal (C, M.

Y or 1/G, B) or 4-color print signal (B, C
, M, Y) only when the mode specified by the control signal line 101 is writing to line buffer 1, game 1-102.103.
104 and 106 are opened, and line buffers 146 for each color are opened.
, 147, 148° 149. On the other hand, the address setting pulse 107 changes the value indicated by the line buffer head address input line 106 to the address counter 0.
8, and the number of cicadas in the address counter 08 increases by one in response to a pulse 109 indicating the timing at which input data (B, (3, M, Y) is sent.

■11 Next, the upper two bits of the address counter 08 are coded by the decoder 110, and the line buffers 14 for each color are
Random access memory (hereinafter referred to as RAM) 111 to 114, 115 comprising 6,147,148,149
~118,119~122°123~126 (B is 1
11-114.0 is 116-11s, M is 119-12
2. Y is given to 123 to 126) to designate the RAM into which input data is written. In addition, the address counter 10
The address data of the lower 10 bits indicated by 8 is sent to the RAM 11 constituting the line buffers 146, 147, 148, 149 for each color via the buffers 127 to 130 for each color.
1~114,115~118°119~122,123
~126, and input image data in order (
Write to RAM.

A series of color image data is sent to the apparatus via direct memory access (DMA) (not shown).

Next, line buffers 146, 147°148,
Reading of data from the buffer 149 is also performed by DMA operation in the same manner as the writing, and is performed by DMA transfer from the buffer 1.

First, a data conversion format indicating data rearrangement is specified by the control line 131, and the data format is the RAM 111 to 114, 115 to 118, which constitutes each color line bar file 146, 148, 149. 119-12
2.

The data indicated by the same addresses 123 to 126 are read out, and one pixel per pixel is stored in the same manner as the input data format.

Picture element sequential readout mode that transfers C, M, and Y continuously, and B
, C, M, and Y, two types of color sequential modes are possible, in which only the line buffer 1 specified by the control line 132 is read out. In this way, each color line buffer 146, 147 .
A decoder 133 generates a selection signal for the read data from 148 and 149. 134 to 137 are decoders 133
This is a tri-state buffer 1 that selects data to be transferred based on a selection signal generated by the buffer 1. Reference numeral 138 denotes a read timing control circuit, which controls a read timing pulse 139, a clock pulse 14o of the line buffer 1 address counter 108, and a timing pulse 14 of the decoder 133.
1 and the data acquisition pulses for each of the hillatches 142 and 143. The output data selected by buffers 134 to 137 are sequentially fetched into latches 142 and 143 and transferred via buffers 144 and 146.

In the configuration of the above embodiment, the line rough 1146~
It goes without saying that the 149 can be configured with any RAM, but it can also be configured using a separate type RAM with independent output terminals or an output type RAM. In addition, in the embodiment, the case where the number of data vias is 8 bits is shown, but for example, when it is configured with 4 bits and the DMA transfer is a word transfer. In this case, four latch capture pulses are generated in the read timing control circuit 138, and two latches are added in addition to the latches 142 and 143.

As described above, when converting the data format of a color image, the present invention continuously converts pixel data of multiple colors per pixel from the line buffer 1 for each color storing a series of color image data. This is a data format conversion device for color images that can perform either a pixel-sequential method in which pixels are read out or a color-by-color sequential method in which only specified colors are successively read out, either independently or by switching as appropriate. Data can be converted in time.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of a color image data conversion device according to the present invention.

Claims (1)

[Scope of Claims] (1) A line buffer for each color that stores a series of color image data of multiple colors, and a pixel sequential method that sequentially reads multiple color data per pixel from the line buffer for each pixel; 1. A data format converting device for color images, comprising means for selecting and reading out one of a color-specific sequential method for reading out only specified colors one after another. (3) Reading image data from the line buffer Evening format conversion device.