Dct - based resolution telescopic image coding - and decoding methods

摘要

The present invention provides a dct - based resolution telescopic image coding - and decoding methods, which is characterized in that in the coding process - an original image or video frame in (4 × n)² × (4 × N)² Macro blocks is divided and subsequently coated in a (4 × n) × (4 × n) code blocks are divided that, under the use of the frequency of the coefficients in the code blocks according to the dct quantification, the corresponding relative positions in the blocks, and the resolution property of the same frequency in the same reorganized code block for the coding according to the priority of the resolution is arranged; that in the laser engraving of the process according to the received frequency of the reorganized code blocks it into the dct positions in the original macroblocks are reset, and after the degree of resolution of the current code blocks a idct - coding module is selected, in order to provide a resolution telescopic image to form new. The coding - and decoding method has the advantage that the corresponding encoded data rate according to the different receiving terminal can be transmitted, so that effectively transmission bandwidth can be saved, and the resolution of telescopic coding and decoding more flexible than the dwt is realized.