在多视点视频系统中,用户端的随机访问性能是表征交互能力的一个重要指标。当用户进行随机访问时,需要快速确定相应的解码路径,以快速有效地获得相应视点与时刻的图像帧。针对H.264多视点视频系统中随机访问效率不高这个情况,分析了传统多视点视频系统随机访问解码路径的计算方法,讨论了其中存在的非最优解码路径问题,提出帧等级矩阵的概念。然后,提出针对HBP(hierarchical B pictures)这种具有代表性的多视点视频编码预测结构的解码路径计算快速算法。实验结果表明,所提算法能获得较优解码路径,从而有效地提高随机访问性能,降低解码复杂度。
Color inconsistency between views is an important problem to be solved in multi-view video applications, such as free viewpoint television and other three-dimensional video systems. In this paper, by combining with multi-view video coding, a coding-oriented multi-view video color correction method is proposed. We first separate foreground and background in first Ggroup Oof Ppictures (GOP) by using SKIP coding mode. Then by transferring means and standard deviations in backgrounds, color correction is performed for each frame in GOP, and multi-view video coding is performed and used to renew the backgrounds. Experimental results show the proposed method can obtain better perform-ances in color correction and multi-view video coding.
