基于H.264的感兴趣区域视频编码研究

发布时间：2018-03-03 22:36

本文选题：H.264视频编码　切入点：资源分配　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着移动互联网的快速发展，数据通信尤其是视频通信得到了比以往更广泛的应用。H.264是面向未来IP和无线网络传输环境提出的新一代视频编码标准，在压缩效率和网络适应性等方面性能显著提高，但是H.264高效的编码性能是以其巨大的计算复杂度为代价的。同时，H.264的码率控制因为其采用的率失真优化技术而变得更加复杂。研究表明，不同视频场景对人类视觉系统（Human Visual System, HVS）的重要性是不同的，然而传统的视频编码算法并没有充分考虑HVS对视频场景感知的多样性。因此，如何利用HVS特性，对H.264编码的计算资源和比特资源进行分配，以改善H.264的编码性能，具有重要的理论意义和应用价值。本文正是在这种背景下，对基于感兴趣区域的视频编码资源分配算法做出一定贡献：首先，对视频编码的研究发展历程做了简要介绍，具体介绍了H.264视频编码标准，对其编码框架、关键的技术特征和码流结构都进行了理论分析。同时，详细介绍了H.264所采用的三层控制结构的码率控制器，并详述了现有的码率控制技术缺陷和基于感兴趣区域的比特资源分配的可能性。其次，提出了基于感兴趣区域的视频编码计算资源分配算法。在满足感兴趣区域的视频编码质量前提下，对视频编码计算资源进行优化分配，以达到降低编码复杂度，使其适合实时传输处理的目的。对比分析该算法相对于H.264标准JM代码，在不降低感兴趣区域的视频质量情况下，计算节省编码时间的比例，编码效率更高。最后，提出了基于感兴趣区域的视频编码比特资源分配算法。该算法在低码率视频编码传输比特资源受限的情况下，通过控制不同区域的量化参数，能够将更多的比特资源分配给人眼感兴趣区域，并通过感兴趣区域分级，将不同区域视频质量平滑过渡。该算法在变码率情况下仍然适用，，实验结果表明，该算法能够实现码率控制，并提高感兴趣区域的PSNR值，节省比特资源。
[Abstract]:With the rapid development of mobile Internet, data communication, especially video communication, has been more widely used than ever before. H.264 is a new generation video coding standard for future IP and wireless network transmission environment. The compression efficiency and network adaptability are improved significantly, but the efficient coding performance of H.264 is at the expense of its huge computational complexity. Meanwhile, the rate control of H.264 becomes more complex because of the rate-distortion optimization technology used in H. 264. The research shows that the importance of different video scenes to human visual system is different. However, the traditional video coding algorithms do not fully consider the diversity of HVS's perception of video scenes. Therefore, how to make use of the HVS characteristics, It is of great theoretical significance and practical value to allocate computing resources and bit resources of H.264 coding in order to improve the coding performance of H.264. It makes some contributions to the algorithm of resource allocation for video coding based on region of interest (ROI). Firstly, the research and development of video coding are briefly introduced, and the H.264 video coding standard is introduced in detail. The coding framework, key technical features and code stream structure are analyzed theoretically. This paper introduces the rate controller of the three-layer control structure used in H.264 in detail, and describes the defects of the existing rate control technology and the possibility of bit resource allocation based on the region of interest. Secondly, this paper proposes a video coding computing resource allocation algorithm based on the region of interest. Under the premise of satisfying the video coding quality of the region of interest, the video coding computing resources are allocated optimally to reduce the coding complexity. Compared with the standard JM code of H.264, the proposed algorithm is more efficient than the JM code of H.264, and the ratio of saving coding time is calculated without reducing the video quality of the region of interest. Finally, a video coding bit resource allocation algorithm based on the region of interest is proposed, which can control the quantization parameters of different regions in the case of low bit-rate video coding transmission bit resource constraints. More bit resources can be allocated to the region of interest, and the video quality of different regions can be smoothly transitioned through the classification of the region of interest. The algorithm is still applicable in the case of variable bit rate. Experimental results show that, The algorithm can achieve bit rate control, improve the PSNR value of the region of interest, and save bit resources.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.81

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