图片无损压缩方法：对大量的相似图片序列进行无损压缩的程序，尤其适用于固定位置的抓拍图。
本项目的初衷是探索对大批量的相似图片进行无损压缩方法：即设计一个对大量的相似图片序列进行无损压缩的程序，尤其适用于固定位置的抓拍机的抓拍图。
设想的是
m-ref = sign(m-ref)*abs(m-ref)
即将当前图像m与参考图像ref作差，得到其符号图像和差值图像，符号图像是二值图像，可以较好地压缩，而由于相似度较大，差值图像也可以较好地进行压缩。
若符号图像和差值图像可无损保存，则可以无损地恢复原始图像m，本项目采用zlib压缩和解压，已经被证实这是可行的。
然而经过测试发现，此项目效果不佳，仅针对相似度较高的图片序列可能有效果。相似图像之间的压缩，宜采用H.264,H.265等有损算法，或许可以大幅提升压缩比。
2019-10-29
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