基于3-参数变长编码的图像无损压缩算法

摘要

According to the study and analysis of Huffman coding method,this research proposes a kind of image lossless compression algorithm,which is based on 3-parameter variable length coding (3-PVLC).By conversion of image data to hybrid differential data,this research uses 3-PVLC for the 1st coding.After the 1st coding,an adaptive run-length reduction method is used for the 2nd coding to compress the achieved binary stream.The processes of coding and decoding in this research are simple,and this method possesses a higher compression ratio.%通过对Huffman编码方法的研究和分析,提出了一种基于3-参数变长编码(3-PVLC)的图像数据无损压缩算法.在图像数据转换为混合差分数据基础上,采用3-PVLC对差分数据进行一次编码,并利用一种自适应性的游长缩减法对一次编码后的二值码流进行二次编码.本文的编解码方法较灵活,可依据具体需要进行基于3-PVLC方法的一次编码或在一次编码基础上完成二次编码,且具较高压缩比.