【摘要】 为了提高EZW算法的编码效率,采用区间逐次缩减逼近量化的辅扫描来简化EZW编码,进而结合重要系数二进制位的特点提出了位渐进逼近量化的EZW改进算法.位渐进逼近量化的EZW改进算法舍弃了传统EZW编码中繁琐的量化编码器构造过程,采用直接输出辅扫描表中数据二进制位的方案来得到辅扫描编码输出,简化了辅扫描的量化编码过程.实验结果表明,位渐进逼近量化的EZW改进算法能使编码时间减少20%左右,从而证实了本文改进算法的有效性.更多还原

【Abstract】 To improve the coding efficiency of EZW algorithm,the interval-successive-reduction approximation quantization is adopted to simplify the coding of subordinate pass,and then the improved EZW algorithm of bit successive approximation quantization for subordinate pass is presented by combining the feature of binary-bit of the significant coefficient and the interval-successive-reduction approximation quantization.This improved approach can output the binary-bit of the data in subordinate pass list directly,which discards the fussy constructing for quantizer and simplifies the coding process.Experimental results show that the improved EZW algorithm can reduce the coding time about 20%,which proves its effectiveness.更多还原