Coefficient Compensation Method for Embedded Codec
Shengkui Dai, Jianguo Liu, Xiu-li Tang · 2009
A simple coefficient compensation method is proposed for the discarded low-bit coefficient in embedded decoding system. First, the coefficient matrix of image is extended as a "general" image. Then some traditional conceptions and quantitative index of image's quality in spatial domain can be borrowed to evaluate the coefficient matrix in transform domain. By defining a special evaluation rule for the coefficient matrix, a simple method is deduced to compensate the coefficients before inverse transformation operation. Experiments indicated its effect to enhance the quality of decoded image. This method can also be used in other codec based on bit-plane scanning.