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结构相似度的立体视频错误隐藏

ISSN号：1003-501X
期刊名称：光电工程
时间：2014.4.15
页码：60-68
分类：TP391[自动化与计算机技术—计算机应用技术;自动化与计算机技术—计算机科学与技术]
作者机构：[1]宁波大学信息科学与工程学院,浙江宁波315211, [2]南京大学软件新技术国家重点实验室,南京210093
相关基金：国家自然科学基金（61171163,61271270,61271021,61311140262）;国家科技支撑计划项目课题（2012BAH67F01）资助的课题.
相关项目：高效3D视频感知编码及码率控制研究

关键词：立体视频, 整帧丢失, 错误隐藏, 右视点时域SSIM, 右视点视间SSIM, stereoscopic video, full frame loss, error concealment, temporal SSIM in right view, inter-view SSIM in right view

中文摘要：

针对立体视频传输中右视点整帧丢失，提出了一种基于结构相似度（Structural Similarity，SSIM）的立体视频右视点整帧丢失错误隐藏算法。首先，提出了时域SSIM和视间SSIM的概念。然后，根据视频序列的时域相关性，将前一时刻右视点图像宏块的预测方式作为丢失图像宏块的预测方式。接着，将前一时刻右视点图像以宏块为单位进行时域和视间匹配，求取其以像素为单位的时域SSIM映射图和视间SSIM映射图。最后，计算并比较前一时刻右视点图像每个宏块的时域SSIM和视问SSIM值，得到每个宏块的预测方式，将其预测方式作为丢失帧中宏块的预测方式，从而使用运动补偿预测或者视差补偿预测的方法进行恢复。实验结果表明，与传统的算法和Pang的算法相比，PSNR值分别提高了2．76dB和3．43dB，且本文算法主观效果较好。

英文摘要：

An error concealment algorithm in stereoscopic video transmission based on structural similarity （SSIM） is proposed. Firstly, the concepts of temporal and inter-view SS1M are presented. Secondly, according to the temporal correlation of video sequence, the prediction mode of a Macroblock （MB） in the right view on the previous time is taken as the prediction mode of the lost MB. Thirdly, temporal and inter-view correspondence is adopted to obtain the pixel-wise SSIM map of the right view on the previous time. Finally, the prediction of the MB is obtained by comparing the SSIM values of each MB between the temporal and inter-view of the right view in the previous stereo image pairs. Consequently, the given MB prediction mode is taken as the MB mode in the lost frame, and the motion and disparity compensated prediction are used to restore the content of the lost frame. Experimental results show that the proposed algorithm has improved the PSNR by 2.76 dB and 3.43 dB compared with the traditional methods and Pang＇s algorithm, respectively. Meanwhile, the proposed algorithm is efficient in improving the subjective quality of the concealed lost frames.

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