一种基于局部可信视差的立体图像误码掩盖算法

为解决立体图像传输的差错问题,提出了一种基于局部可信视差的掩盖方法。首先,考虑到存在丢失块,并结合像素间色彩空间相似程度和几何空间距离接近程度等因素,设计了基准点偏置的窗口用于自适应权重的视差匹配;然后根据视差连续性原则和左右一致性约束,得出局部的可信视差;最后采用"胜者为王"(Winner-Takes-All)策略估计丢失块的视差,并根据此视差提取相应块来进行误码掩盖.实验结果表明,与其他掩盖算法相比,该算法在计算复杂度相当的情况下,无论在重建图像的PSNR还是主观质量上均具有较好的效果.

An Error Concealment Algorithm for Stereoscopic Images Based on Local Reliable Disparities

In order to minimize the transmission errors for stereoscopic images,we propose an error concealment algorithm based on local reliable disparities.First,taking the block loss and the factors of color similarity and geometric distance proximity into account,we design a base-point-biased window to conduct the adaptive weight disparity matching.Second,local reliable disparities are calculated according to the disparity constancy and left-right consistency.Finally,the Winner-Takes-All (WTA) strategy is adopted to estimate the disparity of lost block which will be used to get the data of corresponding block for error concealment.Experimental results show that compared with other algorithms,the proposed method can produce better PSNR and subjective quality of reconstructed image while the computational complexity is almost the same.