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An improved fast mode decision algorithm for intraprediction in H.264/AVC video coding 总被引:1,自引:0,他引:1
Manuel de-Frutos-Lpez Daniel Orellana-Quirs Jos C. Pujol-Alcolado Fernando Díaz-de-María 《Signal Processing: Image Communication》2010,25(10):709-716
In this article, an improved version of one of the most cited intra mode decision algorithms in H.264/AVC video coding is proposed with the aim to improve its efficiency and performance. The reference algorithm determines the interpolation/extrapolation spatial direction (mode) for achieving the best intra prediction using the Sobel gradient calculation. The proposed algorithm suggests reducing the number of gradients calculated and changing the Sobel operator to that of Roberts. In addition to this, it also proposes including the previously encoded neighboring block modes among the evaluated modes. Experimental results show that the proposed algorithm reduces the computational load of the original algorithm and substantially improves its rate-distortion performance. 相似文献
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Sung-Wen Wang Shu-Sian Yang Hong-Ming Chen Chia-Lin Yang Ja-Ling Wu 《Journal of Signal Processing Systems》2009,57(2):195-211
Deblocking filter is one of the most time consuming modules in the H.264/AVC decoder as indicated in many studies. Therefore,
accelerating deblocking filter is critical for improving the overall decoding performance. This paper proposes a novel parallel
algorithm for H.264/AVC deblocking filter to speed the H.264/AVC decoder up. We exploit pixel-level data parallelism among
filtering steps, and observe that results of each filtering step only affect a limited region of pixels. We call this “the limited propagation effect”. Based on this observation, the proposed algorithm could partition a frame into multiple independent rectangles with arbitrary
granularity. The proposed parallel deblocking filter algorithm requires very little synchronization overhead, and provides
good scalability. Experimental results show that applying the proposed parallelization method to a SIMD optimized sequential
deblocking filter achieves up to 95.31% and 224.07% speedup on a two-core and four-core processor, respectively. We have also
observed a significant speedup for H.264/AVC decoding, 21% and 34% on a two-core and four-core processor, respectively.
Sung-Wen Wang received his Ph.D. degree in computer science from National Taiwan University, Taipei, Taiwan, in 2008. His general research interests are in the field of digital video coding, codec-processor architecture co-design and multimedia systems optimization, especially in video coding technology optimization. Shu-Sian Yang received the B.S. and M.S. degrees in computer science and information engineering from National Taiwan University, Taiwan, in 2005 and 2007, respectively. His current research interests include video compression, image processing, and multimedia application. He is currently working at PixArt Imaging Inc., HsinChu, Taiwan as a senior engineer. Hong-Ming Chen received the B.S. degree in computer science and information engineering from National Taiwan University, Taiwan, in 2007. He is currently pursuing the M.S. degree in the same department in National Taiwan University. His current research interests include video compression, image processing, digital content analysis, and multimedia application. Chia-Lin Yang received the B.S. degree from the National Taiwan Normal University, Taiwan, R.O.C., in 1989, the M.S. degree from the University of Texas at Austin in 1992, and the Ph.D. degree from the Department of Computer Science, Duke University, Durham, NC, in 2001. In 1993, she joined VLSI Technology Inc. (now Philips Semiconductors) as a Software Engineer. She is currently an Associate Professor in the Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan, R.O.C. Her research interests include energy-efficient microarchitectures, memory hierarchy design, and multimedia workload characterization. Dr. Yang is the recipient of a 2000-2001 Intel Foundation Graduate Fellowship Award and 2005 IBM Faculty Award. Ja-Ling Wu (SM ’98, Fellow ’08) received his Ph.D. degree in electrical engineering from Tatung Institute of Technology, Taipei, Taiwan, in 1986. From 1986 to 1987, he was an Associate Professor of the Electrical Engineering Department, Tatung Institute of Technology. Since 1987, he transferred to the Department of Computer Science and Information Engineering(CSIE), National Taiwan University(NTU), Taipei, where he is presently a Professor. From 1996 to 1998, he was assigned to be the first Head of the CSIE Department, National Chi Nan University, Puli, Taiwan. During his sabbatical leave (from 1998 to 1999), Prof. Wu was invited to be the Chief Technology Officer of the Cyberlink Corp. In this one year term, he involved with the developments of some well-known audio-video softwares, such as the PowerDVD. Since Aug. 2004, Prof. Wu has been appointed to head the Graduate Institute of Networking and Multimedia, NTU. Prof. Wu has published more than 200 technique and conference papers. His research interests include digital signal processing, image and video compression, digital content analysis, multimedia systems, digital watermarking, and digital right management systems. Prof. Wu was the recipient of the Outstanding Young Medal of the Republic of China in 1987 and the Outstanding Research Award three times of the National Science Council, Republic of China, in 1998, 2000 and 2004, respectively. In 2001, his paper “Hidden Digital Watermark in Images” (co-authored with Prof. Chiou-Ting Hsu), published in IEEE Transactions on Image Processing, was selected to be one of the winners of the “Honoring Excellence in Taiwanese Research Award”, offered by ISI Thomson Scientific. Moreover, his paper “Tiling Slideshow” (co-authored with his students) won the Best Full Technical Paper Award in ACM Multimedia 2006. Professor Wu was selected to be one of the lifetime Distinguished Professors of NTU, November 2006. Prof. Wu has been elected to be IEEE Fellow, since 1 January 2008, for his contributions to image and video analysis, coding, digital watermarking, and rights management. 相似文献
Ja-Ling WuEmail: |
Sung-Wen Wang received his Ph.D. degree in computer science from National Taiwan University, Taipei, Taiwan, in 2008. His general research interests are in the field of digital video coding, codec-processor architecture co-design and multimedia systems optimization, especially in video coding technology optimization. Shu-Sian Yang received the B.S. and M.S. degrees in computer science and information engineering from National Taiwan University, Taiwan, in 2005 and 2007, respectively. His current research interests include video compression, image processing, and multimedia application. He is currently working at PixArt Imaging Inc., HsinChu, Taiwan as a senior engineer. Hong-Ming Chen received the B.S. degree in computer science and information engineering from National Taiwan University, Taiwan, in 2007. He is currently pursuing the M.S. degree in the same department in National Taiwan University. His current research interests include video compression, image processing, digital content analysis, and multimedia application. Chia-Lin Yang received the B.S. degree from the National Taiwan Normal University, Taiwan, R.O.C., in 1989, the M.S. degree from the University of Texas at Austin in 1992, and the Ph.D. degree from the Department of Computer Science, Duke University, Durham, NC, in 2001. In 1993, she joined VLSI Technology Inc. (now Philips Semiconductors) as a Software Engineer. She is currently an Associate Professor in the Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan, R.O.C. Her research interests include energy-efficient microarchitectures, memory hierarchy design, and multimedia workload characterization. Dr. Yang is the recipient of a 2000-2001 Intel Foundation Graduate Fellowship Award and 2005 IBM Faculty Award. Ja-Ling Wu (SM ’98, Fellow ’08) received his Ph.D. degree in electrical engineering from Tatung Institute of Technology, Taipei, Taiwan, in 1986. From 1986 to 1987, he was an Associate Professor of the Electrical Engineering Department, Tatung Institute of Technology. Since 1987, he transferred to the Department of Computer Science and Information Engineering(CSIE), National Taiwan University(NTU), Taipei, where he is presently a Professor. From 1996 to 1998, he was assigned to be the first Head of the CSIE Department, National Chi Nan University, Puli, Taiwan. During his sabbatical leave (from 1998 to 1999), Prof. Wu was invited to be the Chief Technology Officer of the Cyberlink Corp. In this one year term, he involved with the developments of some well-known audio-video softwares, such as the PowerDVD. Since Aug. 2004, Prof. Wu has been appointed to head the Graduate Institute of Networking and Multimedia, NTU. Prof. Wu has published more than 200 technique and conference papers. His research interests include digital signal processing, image and video compression, digital content analysis, multimedia systems, digital watermarking, and digital right management systems. Prof. Wu was the recipient of the Outstanding Young Medal of the Republic of China in 1987 and the Outstanding Research Award three times of the National Science Council, Republic of China, in 1998, 2000 and 2004, respectively. In 2001, his paper “Hidden Digital Watermark in Images” (co-authored with Prof. Chiou-Ting Hsu), published in IEEE Transactions on Image Processing, was selected to be one of the winners of the “Honoring Excellence in Taiwanese Research Award”, offered by ISI Thomson Scientific. Moreover, his paper “Tiling Slideshow” (co-authored with his students) won the Best Full Technical Paper Award in ACM Multimedia 2006. Professor Wu was selected to be one of the lifetime Distinguished Professors of NTU, November 2006. Prof. Wu has been elected to be IEEE Fellow, since 1 January 2008, for his contributions to image and video analysis, coding, digital watermarking, and rights management. 相似文献
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抗重量化转码的H.264/AVC视频水印算法 总被引:2,自引:0,他引:2
根据H.264/AVC特定的编解码架构,该文提出一种基于残差系数符号编码的新水印方案。在重量化转码分析的基础上,结合纹理复杂度和率失真开销差距选择嵌入水印的宏块,解决了重量化转码过程中宏块模式变化引起水印不同步问题。水印嵌入不是直接对系数进行叠加,而是结合DCT残差系数特点,通过特定的符号编码方式对系数进行轻微调制。实验结果表明,该算法可以抵抗重量化转码、加性白高斯噪声、亮度与对比度调节等攻击,并且能很好地保持视频感知质量。 相似文献
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视频编码H.264/AVC新技术及其优化 总被引:1,自引:0,他引:1
本文详细介绍了视频编码新标准H.264/AVC中的运动估计和运动补偿、预测、证书变换、量化、熵编码环路滤波、帧切换等技术及其优化设计. 相似文献
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利用变换域信息快速实现H.264帧内预测编码的新算法 总被引:1,自引:0,他引:1
新的视频编码标准H.264中采用了帧内预测技术,能够极大地减少空间冗余性,从而进一步提高了对帧内宏块编码的效率,但同时也增大了帧内编码的计算时间。为了减少帧内编码时间和编码延迟,该文提出了一种能够快速实现帧内预测编码的新算法。该文算法先利用变换域的信息得到图像纹理的方向,只在最可能的几个模式中进行模式选择,从而降低了运算量。对不同的视频序列测试的结果表明,使用本算法后帧内编码时间可以减少70%左右,同时保持相近的图像压缩质量和码率水平。对于一些实时性要求苛刻的视频压缩应用,采用该文的快速算法会比较有效。 相似文献
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提出梯度方向算子的概念,基于该算子提出了一种H.264帧内模式快速选择算法。本文首先应用梯度方向算子计算编码宏块中各4×4亮度子块的纹理特征和灰度起伏特征,根据这两种特征参量削减4×4帧内候选预测模式。通过统计宏块中各子块的4×4候选预测模式信息,结合梯度方向强度门限判别法削减宏块的16×16候选预测模式,通过率失真优化算法计算得到最优亮度预测模式。进一步根据亮度宏块和色度宏块的对应关系,在亮度候选预测模式的基础上对色度宏块候选预测模式进行削减,最后计算得到最优色度预测模式。该算法削减了50%以上的帧内预测模式,减少了帧内预测模式选择的运算量,实验表明,该算法能够在峰值信噪比和码流比特率变化轻微的前提下减少50%以上的运算量。 相似文献
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H.264/AVC中基于全零块检测的运动估计快速算法 总被引:5,自引:0,他引:5
全零块检测是面向低比特率的视频编码器常用优化方法之一.特别是与运动估计相结合,可以有效的减少编码器的计算复杂性.本文根据H.264/AVC中整数变换的特点,给出了相应的全零块检测门限,提出了一种基于全零块检测的运动搜索提前中止准则.针对H.264/AVC多编码模式的特点,进一步将全零块检测用于H.264/AVC中多种编码模式的选择,有效的提高了运动估计的效率.利用这种方法,在有效减少编码器的计算复杂性,提高H.264/AVC软件编码器编码效率的同时,可以保持比特率和图像质量基本不变. 相似文献
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一种基于H.264/AVC的高效块匹配搜索算法 总被引:15,自引:2,他引:13
本文针对H.264/AVC的编码特点,提出了一种利用时空域运动相关性的快速块匹配搜索算法.该算法充分利用了视频序列的运动程度与宏块编码模式间的关联特性以及运动矢量的统计特征,明显减少了运动估计的搜索复杂度.实验表明,本文方法的搜索速度分别比FS和DS算法平均提高了77.96%和32.19%;重建图像的PSNR比DS算法平均提高了0.06dB,更接近FS算法的编码质量. 相似文献
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Transparent encryption of video content requires to provide a video preview that is left in plaintext, while the enhancement information is encrypted. In this paper we propose three algorithms that provide transparent encryption. The first two ones are based on the idea of generating controlled drift in such a way as to obtain the desired quality level, while the third algorithm employs scalable video coding. We provide experimental results on several video sequences, as well as a security analysis, showing that the proposed algorithms provide an effective framework to perform transparent encryption. 相似文献
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