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零树小波图像编码中的一种选择性系数扫描算法

Selective Coefficient Scan Algorithm in Embedded Zerotree Wavelet Coding

  • 摘要: 针对图像作小波分解后各子带系数的分布特征,提出一种自适应的系数顺序选择算法,用于基于零树结构的图像编码中.结果表明,该算法在不增加编解码复杂度和码率的前提下,较为有效地保存了原图像的高频细节,改善了重建图像的视觉效果.在低码率的视频和图像编码应用中,该算法对视觉质量的改进尤为显著.

     

    Abstract: In accordance with the distribution characteristics of subband coefficients of image coding with wavelet decomposition,an adaptive selective coefficient scan algorithm is proposed.Simulation results show that the algorithm efficiently keeps many visual-sensitive high frequency details of source image and significantly improves the visual quality of the reconstructed image.The algorithm is also prospective in video coding,especially in low bit rate applications.

     

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