A block-level-based intelligent image compression fast rate control method

Abstract

The application discloses a kind of intelligent image compression fast code rate control methods based on block level.The method includes the following steps: S1, the input picture is divided into non-overlapping same size block;S2, sample part image block;S3, the image block of twice coding and decoding is decoded to the sample, according to the relationship between the coding and decoding result and the quality factor λ of image block rate R, and the relationship between the quality factor λ of image block distortion D;S4, the average image gradient of each image block is calculated;S5, using linear relationship fitting each sampled image block average image gradient and the coefficient of R-λ relationship and D-λ relationship;S6, the R-λ relationship and D-λ relationship of not being sampled block are predicted;S7, according to the R-λ relationship and D-λ relationship of each block, the code rate control of image is carried out.The application compared with other code rate control methods, has more accurate code rate control precision, faster speed and lower memory consumption.

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