针对公交车辆的图像监控系统的要求,采用MPEG-4视频编码器对每个宏块在传送过程中Cache严重缺失,视频序列帧率低等问题,提出了运动估计算法的优化、DCT优化、SAD和像素插值优化,以及增加预判别全零DCT系数算法,并在TMS320 C 6455 DSP平...针对公交车辆的图像监控系统的要求,采用MPEG-4视频编码器对每个宏块在传送过程中Cache严重缺失,视频序列帧率低等问题,提出了运动估计算法的优化、DCT优化、SAD和像素插值优化,以及增加预判别全零DCT系数算法,并在TMS320 C 6455 DSP平台上实现了MPEG-4视频编码器的优化.展开更多
针对高效视频编码(high efficiency video coding,HEVC)分像素运动估计亮度分量插值算法计算量大、冗余度高、难以实现不同编码块之间灵活切换的问题,提出一种动态可重构且具有高数据复用率的分像素插值算法实现方法。根据编码单元(codi...针对高效视频编码(high efficiency video coding,HEVC)分像素运动估计亮度分量插值算法计算量大、冗余度高、难以实现不同编码块之间灵活切换的问题,提出一种动态可重构且具有高数据复用率的分像素插值算法实现方法。根据编码单元(coding unit,CU)的规模和大小自适应地对其周围参考像素块进行插值计算,得到最优预测单元的编码模式和运动矢量。实验结果表明,与专用硬件实现的分像素插值算法相比,不同编码块灵活切换的同时,参考像素的读取数量减少43.8%,硬件资源消耗减少18.5%。展开更多
Based on the property analysis of interferential multispectral images, a novel compression algorithm of partial set partitioning in hierarchical trees （SPIHT） with classified weighted rate-distortion optimization is...Based on the property analysis of interferential multispectral images, a novel compression algorithm of partial set partitioning in hierarchical trees （SPIHT） with classified weighted rate-distortion optimization is presented. After wavelet decomposition, partial SPIHT is applied to each zero tree independently by adaptively selecting one of three coding modes according to the probability of the significant coefficients in each bitplane. Meanwhile the interferential multispectral image is partitioned into two kinds of regions in terms of luminous intensity, and the rate-distortion slopes of zero trees are then lifted with classified weights according to their distortion contribution to the constructed spectrum. Finally a global rate- distortion optimization truncation is performed. Compared with the conventional methods, the proposed algorithm not only improves the performance in spatial domain but also reduces the distortion in spectral domain.展开更多
文摘针对公交车辆的图像监控系统的要求,采用MPEG-4视频编码器对每个宏块在传送过程中Cache严重缺失,视频序列帧率低等问题,提出了运动估计算法的优化、DCT优化、SAD和像素插值优化,以及增加预判别全零DCT系数算法,并在TMS320 C 6455 DSP平台上实现了MPEG-4视频编码器的优化.
文摘针对高效视频编码(high efficiency video coding,HEVC)分像素运动估计亮度分量插值算法计算量大、冗余度高、难以实现不同编码块之间灵活切换的问题,提出一种动态可重构且具有高数据复用率的分像素插值算法实现方法。根据编码单元(coding unit,CU)的规模和大小自适应地对其周围参考像素块进行插值计算,得到最优预测单元的编码模式和运动矢量。实验结果表明,与专用硬件实现的分像素插值算法相比,不同编码块灵活切换的同时,参考像素的读取数量减少43.8%,硬件资源消耗减少18.5%。
基金the National Natural Sci-ence Foundation of China (No.60532060 and 60507012)the Innovation Foundation of Xidian University (Chuang 05025).
文摘Based on the property analysis of interferential multispectral images, a novel compression algorithm of partial set partitioning in hierarchical trees （SPIHT） with classified weighted rate-distortion optimization is presented. After wavelet decomposition, partial SPIHT is applied to each zero tree independently by adaptively selecting one of three coding modes according to the probability of the significant coefficients in each bitplane. Meanwhile the interferential multispectral image is partitioned into two kinds of regions in terms of luminous intensity, and the rate-distortion slopes of zero trees are then lifted with classified weights according to their distortion contribution to the constructed spectrum. Finally a global rate- distortion optimization truncation is performed. Compared with the conventional methods, the proposed algorithm not only improves the performance in spatial domain but also reduces the distortion in spectral domain.
