视频压缩感知多假设局部增强重构算法

在基于多假设预测的视频压缩感知重构中, 不同图像块对应的假设集匹配程度差异较大, 因此重构难度差异明显. 本文提出多假设局部增强重构算法(Local enhancement reconstruction algorithm based on multi-hypothesis prediction, MH-LE), 利用帧间相关性对图像块进行分类后针对运动图像块提出像素域双路匹配策略, 通过强化图像块基本特征来提高相似块匹配效果, 获取更高质量的假设集; 同时将结构相似度评价标准引入假设块权值分配过程, 提高预测精度. 仿真结果表明, 所提算法的重构质量明显优于其他多假设预测重构算法. 和基于组稀疏的重构算法相比, 所提算法具有更快的重构速度, 在大部分的采样率条件下具有更高的重构质量.

Local Enhancement Reconstruction Algorithm Based on Multi-hypothesis Prediction in Compressed Video Sensing

In multi-hypothesis prediction-based compressed video sensing reconstruction algorithms, the matching degrees of the hypothesis set corresponding to different image blocks are quite different, so the reconstruction difficulty of different blocks is obviously different. In this paper, a local enhancement reconstruction algorithm based on multi-hypothesis (MH-LE) is proposed. Image blocks are classified into two categories and a pixel domain dual channel matching strategy is proposed for moving image blocks, where the basic features of the image blocks are enhanced to improve the matching effectivity of similar blocks and obtain a higher quality hypothesis set. Besides, the structural similarity evaluation criteria are introduced into the matching block weight assignment process to improve prediction accuracy. The simulation results show that the reconstruction quality of the proposed algorithm is superior to other multi-hypothesis prediction-based reconstruction algorithms. Compared with the group sparsity-based reconstruction algorithms, the proposed algorithm possesses faster reconstruction speed and higher reconstruction quality at most sampling rates.