JPH0474907B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data format conversion device that rearranges data using a line buffer that stores three-color signals or four-color print signals obtained by color-separating a color image original.

Conventionally, three primary color signals (in the case of subtractive color mixture, cyan C, magenta M,
Yellow Y or additive color mixture (red R, green G, blue B) or 4-color printing signal (black version B, C, M, Y)
Color image data is loaded into a storage device such as a magnetic disk device by a computer, and retrieved and used when necessary. For example, depending on the subject, 3
When it is necessary to process primary color signals simultaneously or color by color, mutual conversion of data such as point-sequential, line-sequential, or field-sequential (field-sequential) is required. Specifically, for example, when converting a color image in pixel data format to color-specific color image data,
Color image data in pixel data format is read from a magnetic disk device, and processing is performed to extract each color by software. 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 overcomes the above-mentioned drawbacks.

An embodiment of the present invention will be described in detail below with reference to the drawings. Three color input signals C, M,
Y or R, G, B or 4 color printing signal B,
C, M, and Y are connected to the gate 10 only when the mode specified by the control signal line 101 is line buffer writing.
2, 103, 104, and 105 are opened and input into line buffers 146, 147, 148, and 149 for each color. On the other hand, the value indicated by the line buffer head address input line 106 is set in the address counter 108 by the address setting pulse 107, and the address counter 108 is set by the pulse 109 indicating the timing at which input data B, C, M, and Y are sent. The value of 108 increases by 1. Next, the upper two bits of the address counter 108 are decoded by a decoder 110, and a random access memory (hereinafter referred to as RAM) 111 configures line buffers 146, 147, 148, and 149 for each color.
~114,115~118,119~122,1
23-126 (B is 111-114, C is 11
5-118, M is 119-122, Y is 123-
126) to which input data is written.
is specified. Further, the address data of the lower 10 bits indicated by the address counter 108 is transferred to the RAMs 111 to 114, 115 to 118, 11 constituting the line buffers 146, 147, 148, 149 for each color via the buffers 127 to 130 for each color.
9 to 122 and 123 to 126, and input image data are written to the RAM in order. A series of color image data is sent to the device via direct memory access DMA (not shown). Next, line buffers 146, 147, 14
Reading of data from 8,149 is also performed by DMA operation and DAM transfer from the buffer in the same way as when writing. First, a data conversion format indicating rearrangement of data is specified by a control line 131, and the data format is converted into a line buffer 146 for each color.
RAM 111 comprising 147, 148, 149
~114,115~118,119~122,1
Read the data indicated by the same address from 23 to 126, and write B,
Two types of picture element sequential readout mode are possible: a picture element sequential readout mode in which C, M, and Y are transferred in succession, and a color-by-color sequential mode in which only the line buffer designated by the control line 132 among B, C, M, and Y is read out. In this way, the control line 131
and 132, each color line buffer 146, 147, 148, 149
A decoder 133 generates a selection signal for read data from the . Tri-state buffers 134 to 137 select data to be transferred in response to a selection signal generated by the decoder 133. 138
is a read timing control circuit which outputs a read timing pulse 139, a clock pulse 104 of the line buffer address counter 108, a timing pulse 141 of the decoder 133, and a latch 1.
42 and 143 respectively to generate data acquisition pulses. The data outputs selected by buffers 134-137 are sequentially captured in latches 142 and 143 and transferred through buffers 144 and 145.

In the configuration of the above embodiment, the line buffer 1
It goes without saying that 46 to 149 can be configured with any RAM, and separate input/output type RAMs with independent input and output terminals may be used, and the decoder 133 and tristate buffers 134 to 137 may be used. , may be configured with a selector.

Further, in the embodiment, the case where the number of data bits is 8 bits is shown, but for example, the number of data bits is 4 bits.
In the case where the DAM transfer is a word transfer and the DAM transfer is a word transfer, the number of latch capture pulses generated by the read timing control circuit 138 is set to four, and
Two additional latches may be added in addition to latches 142 and 143.

As described above, when converting the data format of a color image, the present invention continuously reads out pixel data of a plurality of colors per pixel from a line buffer for each color in which a series of color image data is stored. This is a data format conversion device for color images that can perform either a plain sequential method or a color-specific sequential method in which only specified colors are successively read out, either individually or by switching as appropriate. It can be converted.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of a color image data converting device according to the present invention. 102-105...gate, 108...address counter, 110, 133...decoder, 11
1 to 126...RAM, 134 to 137...tristate buffer, 138...read control circuit, 142, 143...latch, 144, 145
...Batsuhua, 146-149...Line Batsuhua.

Claims (1)

[Claims] 1 A plurality of line buffers that store at least C, M, Y or R, G, B halftone data of color image data for each color; pixel sequential method instruction means for instructing to obtain a plurality of color data output for each pixel of image data;
a color sequential method instruction means for specifying one line buffer to output halftone data to obtain color data output of the color image data; instructions for the pixel sequential method instruction means; and the color sequential method. 1. A color image data format conversion device, comprising: reading means for selecting one of the instructions of the instruction means, controlling the individual line buffers, and reading out the respective line buffers.