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改进的快速算术编码及其在图像编码中的应用

DOI: 10.11834/jig.20070709

Keywords: 算术编码,重归一化,进位传播,图像编码,SPIHT

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Abstract:

为了快速地进行图像编解码,提出了一种改进的快速算术编码方法,该方法是先通过编码区间宽度值与阈值的比较,并以字节为单位进行重归一化,同时输出以字节为单位的编码流;然后通过对当前输出字节的内容进行判断及处理,以便在不额外增加码流的情况下更加有效地处理编码过程中的进位传播的问题,从而简化了编解码过程。实验表明,在使用相同的二进制索引树概率模型时,该方法比CACM87及Jiang提出的方法具有更快的执行速度。最后,将该方法用于以2×2系数块为单位的SPIHT图像编码中,以降低位平面编解码过程的复杂度。

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