与标准的率失真(PCRD)优化算法相比，该算法不会在计算码率失真斜率和搜索最优分层截断点时产生运算开销。
Compared with the standard post-coding rate distortion (PCRD) algorithm, the proposed algorithm has no spending in calculating rate-distortion slope and searching for optimum truncation points.
率失真优化是按照率失真斜率递减的顺序编码系数位，最先编码的位具有最大的率失真斜率，每编码一位都会使失真减少最大。
In rate-distortion optimization coefficients are encoded with a decreasing R-D slope, so the first coding bits are the ones having the steepest R-D slope.
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