多视点彩色加深度视频 (MVD)是目前 3D场景的主流表示方式之一。在 3D-HEVC的编码框架中, 深度视频帧内编码具有较高的编码复杂度。本文提出了一种基于区域分割的 3D-HEVC深度视频快速帧内编码算法。首先根据对应彩色视频的纹理特征和深度视频的边界提取结果, 把深度图分为四个区域；然后统计分析了各区域中深度视频编码失真对绘制中间视点质量的影响以及帧内编码预测模式的分布规律；最后设计了在不同区域里采用不同的 CU尺寸提前决定、模式粗选限定和快速 DMMs模式决定的算法。实验结果表明, 本文提出的算法在绘制的中间视点质量不变的情况下平均节省 55.11%的总体编码时间, 对于深度视频的编码时间平均节省 61.57%。

Multi-view video plus depth (MVD) is one of the main representations of 3D scene. Under the framework 3D-HEVC, the depth video intra coding has high computational complexity. A region segmentation-based fast CU size decision and mode decision algorithm for 3D-HEVC depth video intra coding is proposed. Firstly, the depth map is divided into four regions based on the edge extraction of depth video and texture detection of the corresponding color video texture. Then, the effects of depth video distortion on rendered view quality and mode distribution of intra prediction coding are statistically analyzed in each region. Finally, different CU size, rough prediction mode and DMMs decision are designed for encoding different regions. Experimental results show that the proposed algorithm save the encoding time of MVD by 55.1% on average, and the encoding time of depth video by 61.57% on average with negligible rendered virtual view image degradation.