Image compression coding and decoding methods, image compression coding and decoding apparatus, image compression coding transmission method, a recording medium recording an image compression coding transmission system and image compression encoding and decoding program

摘要

PROBLEM TO BE SOLVED: To apply compression coding processing to a high definition image at high speed with high compression rate by arranging luminance signals in a specific block which results from dividing a digital still or digital dynamic image in the ascending or descending order, ranking them depending on the frequency of the incidence of the luminance and generating the arranged index for applying compression coding to the arranged index and the arranged data. SOLUTION: A two-dimensional block divider 200 in a still image compression coder divides a digital still image 20 into two-dimensional blocks, and an arrangement converter 201 arranged luminance signals in the two-dimensional blocks in the ascending or descending order to convert them into linear data. Furthermore, an index output device 202 put ranks arbitrarily the luminance signals in the two-dimensional blocks depending on the frequency of incidence, and an arrangement index output device 203 used the ranking as the index for generating the arranged index of the luminance signals in the two-dimensional blocks. Then a coder 204 applies compression coding to the arranged linear data and the arranged index and sends the result to the still image decoder via a transmission line.