在H.265/HEVC基于R-λ模型码率控制算法中,为了提高最大编码单元(LCU)的比特分配的效果以及参数(α、β)更新的精度,提出一种码率控制优化算法。该算法主要是利用当前最大编码单元原始比特进行比特分配,以及利用编码失真度对参数(α、β...在H.265/HEVC基于R-λ模型码率控制算法中,为了提高最大编码单元(LCU)的比特分配的效果以及参数(α、β)更新的精度,提出一种码率控制优化算法。该算法主要是利用当前最大编码单元原始比特进行比特分配,以及利用编码失真度对参数(α、β)更新。实验结果表明,在恒定比特率情况下,相对于HM13.0码率控制算法三分量峰值信噪比(PSNR)增益至少提高0.76 d B,编码传输比特每帧消耗比特至少降低0.46%,编码时间至少减少0.54%。展开更多
近年来视频服务产业链的各大版面都充斥着4K,极致高清,但在网络传输带宽及存储空间有限的情况下传输、存储和显示视频却是一个难题。国际电联(I T U)推出新一代的视频编码HEVC/H.265,作为创新时代下全球视频编解码的主角。基于H.264,对...近年来视频服务产业链的各大版面都充斥着4K,极致高清,但在网络传输带宽及存储空间有限的情况下传输、存储和显示视频却是一个难题。国际电联(I T U)推出新一代的视频编码HEVC/H.265,作为创新时代下全球视频编解码的主角。基于H.264,对比分析了H.265标准在编码结构、帧内预测、帧间预测以及熵编码等技术上的改进和算法上的优化,通过实验比较其在编码性能上的优越性。展开更多
High Efficiency Video Coding (HEVC) is the latest international video coding standard, which can provide the similar quality with about half bandwidth compared with its predecessor, H.264/MPEG?4 AVC. To meet the requi...High Efficiency Video Coding (HEVC) is the latest international video coding standard, which can provide the similar quality with about half bandwidth compared with its predecessor, H.264/MPEG?4 AVC. To meet the requirement of higher bit depth coding and more chroma sampling formats, range extensions of HEVC were developed. This paper introduces the coding tools in HEVC range extensions and provides experimental results to compare HEVC range extensions with previous video coding standards. Ex?perimental results show that HEVC range extensions improve coding efficiency much over H.264/MPEG?4 AVC High Predictive profile, especially for 4K sequences.展开更多
爬壁机器人高空作业离不开视频监控,为了提高作业效果需要更高质量的视频传输和显示,这就对视频编码压缩技术提出了更高要求,针对传统视频编码压缩后的图像信噪比和图像质量不高等问题,本文提出了运用H.265编码算法,在嵌入式Linux平台下...爬壁机器人高空作业离不开视频监控,为了提高作业效果需要更高质量的视频传输和显示,这就对视频编码压缩技术提出了更高要求,针对传统视频编码压缩后的图像信噪比和图像质量不高等问题,本文提出了运用H.265编码算法,在嵌入式Linux平台下对H.265高效视频编码算法进行移植,经测试与分析,H.265与传统H.264压缩编码相比,其信噪比平均提高2 d B,监控视频质量得到有效提升.展开更多
In this paper, efficient one-dimensional (1-D) fast integer transform algorithms of the DCT matrix for the H.265 stan-dard is proposed. Based on the symmetric property of the integer transform matrix and the matrix op...In this paper, efficient one-dimensional (1-D) fast integer transform algorithms of the DCT matrix for the H.265 stan-dard is proposed. Based on the symmetric property of the integer transform matrix and the matrix operations, which denote the row/column permutations and the matrix decompositions, along with using the dyadic symmetry modification on the standard matrix, the efficient fast 1-D integer transform algorithms are developed. Therefore, the computational complexities of the proposed fast integer transform are smaller than those of the direct method. In addition to computational complexity reduction one of the proposed algorithms provides transformation quality improvement, while the other provides more computational complexity reduction while maintaining almost the same transformation quality. With lower complexity and better transformation quality, the first proposed fast algorithm is suitable to accelerate the quality-demanding video coding computations. On the other hand, with the significant lower complexity, the second proposed fast algorithm is suitable to accelerate the video coding computations.展开更多
在2003年制定的H.264/AVC视频编码标准获得巨大的成功后,新一代视频编码国际标准HEVC(High Ef-ficiency Video Coding)在ITU-T的VCEG和ISO/IEC的MPEG通力合作下已经开发成功。HEVC提供了多项先进的视频编码技术。尽管HEVC的视频编码层...在2003年制定的H.264/AVC视频编码标准获得巨大的成功后,新一代视频编码国际标准HEVC(High Ef-ficiency Video Coding)在ITU-T的VCEG和ISO/IEC的MPEG通力合作下已经开发成功。HEVC提供了多项先进的视频编码技术。尽管HEVC的视频编码层结构仍然是常见的基于块运动补偿的混合视频编码模式,但是和先前的标准相比具有多处重要改进。文中对HEVC标准的技术的主要特点和性能进行了综述。展开更多
文摘在H.265/HEVC基于R-λ模型码率控制算法中,为了提高最大编码单元(LCU)的比特分配的效果以及参数(α、β)更新的精度,提出一种码率控制优化算法。该算法主要是利用当前最大编码单元原始比特进行比特分配,以及利用编码失真度对参数(α、β)更新。实验结果表明,在恒定比特率情况下,相对于HM13.0码率控制算法三分量峰值信噪比(PSNR)增益至少提高0.76 d B,编码传输比特每帧消耗比特至少降低0.46%,编码时间至少减少0.54%。
文摘近年来视频服务产业链的各大版面都充斥着4K,极致高清,但在网络传输带宽及存储空间有限的情况下传输、存储和显示视频却是一个难题。国际电联(I T U)推出新一代的视频编码HEVC/H.265,作为创新时代下全球视频编解码的主角。基于H.264,对比分析了H.265标准在编码结构、帧内预测、帧间预测以及熵编码等技术上的改进和算法上的优化,通过实验比较其在编码性能上的优越性。
文摘High Efficiency Video Coding (HEVC) is the latest international video coding standard, which can provide the similar quality with about half bandwidth compared with its predecessor, H.264/MPEG?4 AVC. To meet the requirement of higher bit depth coding and more chroma sampling formats, range extensions of HEVC were developed. This paper introduces the coding tools in HEVC range extensions and provides experimental results to compare HEVC range extensions with previous video coding standards. Ex?perimental results show that HEVC range extensions improve coding efficiency much over H.264/MPEG?4 AVC High Predictive profile, especially for 4K sequences.
文摘爬壁机器人高空作业离不开视频监控,为了提高作业效果需要更高质量的视频传输和显示,这就对视频编码压缩技术提出了更高要求,针对传统视频编码压缩后的图像信噪比和图像质量不高等问题,本文提出了运用H.265编码算法,在嵌入式Linux平台下对H.265高效视频编码算法进行移植,经测试与分析,H.265与传统H.264压缩编码相比,其信噪比平均提高2 d B,监控视频质量得到有效提升.
文摘In this paper, efficient one-dimensional (1-D) fast integer transform algorithms of the DCT matrix for the H.265 stan-dard is proposed. Based on the symmetric property of the integer transform matrix and the matrix operations, which denote the row/column permutations and the matrix decompositions, along with using the dyadic symmetry modification on the standard matrix, the efficient fast 1-D integer transform algorithms are developed. Therefore, the computational complexities of the proposed fast integer transform are smaller than those of the direct method. In addition to computational complexity reduction one of the proposed algorithms provides transformation quality improvement, while the other provides more computational complexity reduction while maintaining almost the same transformation quality. With lower complexity and better transformation quality, the first proposed fast algorithm is suitable to accelerate the quality-demanding video coding computations. On the other hand, with the significant lower complexity, the second proposed fast algorithm is suitable to accelerate the video coding computations.
文摘在2003年制定的H.264/AVC视频编码标准获得巨大的成功后,新一代视频编码国际标准HEVC(High Ef-ficiency Video Coding)在ITU-T的VCEG和ISO/IEC的MPEG通力合作下已经开发成功。HEVC提供了多项先进的视频编码技术。尽管HEVC的视频编码层结构仍然是常见的基于块运动补偿的混合视频编码模式,但是和先前的标准相比具有多处重要改进。文中对HEVC标准的技术的主要特点和性能进行了综述。
