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
针对HEVC帧内预测编码计算复杂度高的问题,提出了一种基于分组自适应的帧内预测模式快速选择算法。该算法抽选12个候选模式进行预测方向初步判断,然后根据初步判断结果再精选预测模式;并根据粗选的HCost代价排除部分可能性较低的候选模...针对HEVC帧内预测编码计算复杂度高的问题,提出了一种基于分组自适应的帧内预测模式快速选择算法。该算法抽选12个候选模式进行预测方向初步判断,然后根据初步判断结果再精选预测模式;并根据粗选的HCost代价排除部分可能性较低的候选模式,以达到减少候选模式数量,降低计算复杂度的目的。在HEVC参考软件HM12.0上的测试表明,该算法在BD-PSNR平均损失0.041 d B的情况下,平均可降低36.521%的编码时间,显著提高了编码速度。实验结果显示,该算法的适应性强,对不同尺寸、不同纹理和运动特点的测试序列均有明显效果,具有良好的实际应用价值。展开更多
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.
文摘针对HEVC帧内预测编码计算复杂度高的问题,提出了一种基于分组自适应的帧内预测模式快速选择算法。该算法抽选12个候选模式进行预测方向初步判断,然后根据初步判断结果再精选预测模式;并根据粗选的HCost代价排除部分可能性较低的候选模式,以达到减少候选模式数量,降低计算复杂度的目的。在HEVC参考软件HM12.0上的测试表明,该算法在BD-PSNR平均损失0.041 d B的情况下,平均可降低36.521%的编码时间,显著提高了编码速度。实验结果显示,该算法的适应性强,对不同尺寸、不同纹理和运动特点的测试序列均有明显效果,具有良好的实际应用价值。
