针对当前广播电视信号传输过程中带宽占用大、实时性差等问题,本文采用基于场景复杂度自适应的H.265编码算法,配合基于图像局部匹配算法(Sum of Absolute Differences,SAD)的智能帧率控制技术,在保证画质的前提下优化码率分配。通过搭...针对当前广播电视信号传输过程中带宽占用大、实时性差等问题,本文采用基于场景复杂度自适应的H.265编码算法,配合基于图像局部匹配算法(Sum of Absolute Differences,SAD)的智能帧率控制技术,在保证画质的前提下优化码率分配。通过搭建实验平台,对比分析不同处理方案对信号传输效率的影响。实验数据表明,该基于场景自适应的音视频高效传输系统可使传输带宽降低35%,“端到端”延迟减少40%,同时主观图像质量评分提升15%。展开更多
Fractional motion estimation(FME) improves the video encoding efficiency significantly. However, its high computational complexity limits the real-time processing capability. Therefore, it is a key problem to reduce t...Fractional motion estimation(FME) improves the video encoding efficiency significantly. However, its high computational complexity limits the real-time processing capability. Therefore, it is a key problem to reduce the implementation complexity of FME, especially in hardware design. This paper presents a novel deeply pipelined interpolation architecture of FME for the real-time realization of H.265/HEVC full Ultra-HD video encoder. First, a pipelined interpolation architecture together with an elegant processing order is proposed to deal with different search positions in parallel without pipeline stall and data conflict. Second, interpolation results sharing strategies are exploited among search positions to reduce the memory cost. Finally, the structure of the interpolation filter is further optimized for an area efficient implementation. As a result, the proposed design costs 41 917 slice LUTs on the Xilinx Kintex-7 FPGA platform with a 308 MHz working frequency. The measured throughput reaches a record of 1.238 Gpixels/s, which is sufficient for the real-time encoding of 8192×4320@ 30 fps video.展开更多
为了保证一定视频质量下编码器输出的码率符合给定的目标码率,提出一种考虑视频内容特性的H.265/HEVC帧层码率分配算法。首先从率失真理论分析的角度推导出影响输出码率的主要因素,然后根据视频编码原理,预测出帧内容复杂度参数,从而建...为了保证一定视频质量下编码器输出的码率符合给定的目标码率,提出一种考虑视频内容特性的H.265/HEVC帧层码率分配算法。首先从率失真理论分析的角度推导出影响输出码率的主要因素,然后根据视频编码原理,预测出帧内容复杂度参数,从而建立一种更有效的帧层码率分配算法。实验结果表明,所提算法可以使帧层目标码率与编码码率保持更好的一致性,且重构视频质量平均提高了0.103 d B。展开更多
文摘针对当前广播电视信号传输过程中带宽占用大、实时性差等问题,本文采用基于场景复杂度自适应的H.265编码算法,配合基于图像局部匹配算法(Sum of Absolute Differences,SAD)的智能帧率控制技术,在保证画质的前提下优化码率分配。通过搭建实验平台,对比分析不同处理方案对信号传输效率的影响。实验数据表明,该基于场景自适应的音视频高效传输系统可使传输带宽降低35%,“端到端”延迟减少40%,同时主观图像质量评分提升15%。
基金Supported by the Zhejiang Provincial Natural Science Foundation of China(No.LQ15F010001,LY16F020029)the General Research Project of Zhejiang Provincial Education Department(No.Y201430479)
文摘Fractional motion estimation(FME) improves the video encoding efficiency significantly. However, its high computational complexity limits the real-time processing capability. Therefore, it is a key problem to reduce the implementation complexity of FME, especially in hardware design. This paper presents a novel deeply pipelined interpolation architecture of FME for the real-time realization of H.265/HEVC full Ultra-HD video encoder. First, a pipelined interpolation architecture together with an elegant processing order is proposed to deal with different search positions in parallel without pipeline stall and data conflict. Second, interpolation results sharing strategies are exploited among search positions to reduce the memory cost. Finally, the structure of the interpolation filter is further optimized for an area efficient implementation. As a result, the proposed design costs 41 917 slice LUTs on the Xilinx Kintex-7 FPGA platform with a 308 MHz working frequency. The measured throughput reaches a record of 1.238 Gpixels/s, which is sufficient for the real-time encoding of 8192×4320@ 30 fps video.
文摘为了保证一定视频质量下编码器输出的码率符合给定的目标码率,提出一种考虑视频内容特性的H.265/HEVC帧层码率分配算法。首先从率失真理论分析的角度推导出影响输出码率的主要因素,然后根据视频编码原理,预测出帧内容复杂度参数,从而建立一种更有效的帧层码率分配算法。实验结果表明,所提算法可以使帧层目标码率与编码码率保持更好的一致性,且重构视频质量平均提高了0.103 d B。
