小波图像编码中基于误差分析的错误隐藏方法  

An Error Concealment Method for Wavelet Image Codecs Based on Error Analysis

作　　者：黄海云[1] 朱敏[2] 

机构地区：[1]中国科学院研究生院,北京100080 [2]中国科学院声学研究所,北京100080

出　　处：《计算机工程与应用》2006年第15期75-77,共3页Computer Engineering and Applications

摘　　要：详细分析了不同子带小波系数误码在重构图像中的误码扩散,包括误差值大小、误差能量和失真范围,分析结果表明不同频率的子带系数误码产生的失真存在很大差异,其中低频产生的影响最大。然后提出了一种在图像空间域进行的错误隐藏方法。实验结果表明,该方法可隐藏由于低频系数误码造成的图像失真,能得到较好的重建图像质量,可应用于存在较高误码率的图像传输中。The error propagate in the reconstructed image which arises from the error in wavelet coefficient of different subband is addressed.In this study,the value and energy of the reconstructed image error,and the scope of distort are pointed out.The result shows that the effects of errors vary among different frequency subbands,and the error in a low frequency subband would cause severe loss of perceptual image quallty.Then an error concealment method based on error analysis is proposed in the spatial domain.It is demonstrated by experiments that the proposed method conceals errors in a low frequency subband and greatly improves the quality of the reconstructed image.This method can be applied to image transmission of the high bit error rate.

关 键 词：小波图像编码 误码扩散 错误隐藏 JPEG2000 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]