초록 ▼

A data compressing method which can efficiently compress image data containing color data is provided. A compressed data expanding method which can expand the compressed data at high speed is provided. Image data containing color data are compressed into image data including: address fields code A,

A data compressing method which can efficiently compress image data containing color data is provided. A compressed data expanding method which can expand the compressed data at high speed is provided. Image data containing color data are compressed into image data including: address fields code A, code B, code C which hold addresses of color RAMs storing color information corresponding to the color data; classification fields which, when the color RAMs are classified into prescribed categories A, B, C, hold classification information of the categories including the color data; and run length fields RL which hold numbers of successive repetitions of color data. To expand the compressed image data, the classification fields are decoded to determine the categories in which the color data are included. Based on the determined categories, the first processing for decoding the address fields to generate addresses, and the second processing for supplying the generated addresses by the numbers of successively repeated color data in the run length fields to access the color RAMs are performed.

대표청구항 ▼

[ What is claimed is:] [1.] A data compressing method for compressing image data containing color data, the image data being compressed into image data including: address fields which hold addresses of color information storage means holding color information, the address corresponding to the color

[ What is claimed is:] [1.] A data compressing method for compressing image data containing color data, the image data being compressed into image data including: address fields which hold addresses of color information storage means holding color information, the address corresponding to the color data; classification fields which, when the color information storage means are classified in prescribed categories, hold classification information of the category in which the color data are included; and run length fields which hold numbers of successive repetitions of color data, the run length fields having a decreased bit number when the address fields have a large bit number, so that the image data have a fixed length.