基于多分辨率四叉树的运动分割及交叠块的立体视频帧估计算法

The Frame Estimation Algorithm of Stereo Video Sequences Based on Multi-Resolution Quadtree-Based Motion Segmentation and Overlapped Blocks

为了对立体视频序列进行有效的编解码 ,以获得较好的重建图象 ,提出了一种基于立体视频序列的帧估计及内插方法 .该方法就是在立体视频序列编码中 ,左图象流按MPEG Ⅰ /Ⅱ的视频编码标准进行编码 ;而对右图象流 ,只对参考帧 (Ⅰ帧及P帧 )进行编码 ,右图象流的B帧不进行编码及传送 ,而是在解码端 ,根据各个参考帧通过帧重建及内插来获得 .可变块分割的方法是采用基于多分辨率四叉树分解的运动分割 .对右B帧的重建按照匹配块和失配块分别处理的方法 ,各个块的位置和内容则根据右B帧中的块与右I帧、P帧之间或与左B帧的之间相关性大小来确定 .另外 ,还提出了一种新的可避免误匹配和对显露区进行正确填充 ,并针对交叠块的帧估计和内插方法 .仿真实验表明 ,该图象重建方法与文献 [1]所提出的基于固定块的方法相比 ,能够使得重建图象的峰值信噪比 (PSNR)增加约 1 2 5dB ,并且图象的主观视觉质量评价也明显要好 .

In order to code and decode the stereo video sequences effectually and acquire excellent reconstructed images, a frame estimation and interpolation technique of stereo video sequences is presented in this paper. In stereo sequence coding, the left image stream is coded according to the MPEG-Ⅰ/Ⅱ video coding standard. In the right image stream, only reference frames (I and P) are coded, the B frames in the right image stream are neither coded nor transmitted, they are acquired from the reference frames with the frame reconstruction and interpolation technique at the decoding end. The variable block segmentation is based on a multi-resolution quadtree-based motion segmentation. This paper also proposes a novel method to process the reconstruction of right B frame as matched-block and unmatched-block separately, the positions and content of these blocks are decided on the correlation between the blocks in right B frames and right I, P frames or left B frames. A novel frame reconstruction and interpolation technique for overlapped blocks to avoid false matching and to fill the exposed regions correctly is also proposed in this paper. The simulate experiment results show that the average PSNR is about 1.25dB higher than the method mentioned in the refernce,Which is based on fixed blocks, and the reconstructed frames have a much better presentation on viewing perception.