AVS CHINA IMPLEMENTATION PERFORMANCE ANALYSIS OF VIDEO PROFILES Vamsi Krishna Vegunta University of Texas Arlington Vamsikrishna vegunta mavs uta edu Interim Report Color Space Y CrCb often termed YUV in digital video The HVS is less sensitive to changes in color than in changes in luminance Y CrCb is used to separate out a luma signal Y that can be stored with high resolution or transmitted at high bandwidth and two chroma components CB and CR that can be bandwidth reduced sub sampled compressed or otherwise treated separately for improved system efficiency Chroma Sub Sampling 24 bits pixel 16 bits pixel Fig 1 Chroma sub sampling 1 2 12 bits pixel Layered Structure Sequence Picture Frame Slice Macro block Block Fig 2 Layered structure of AVS China Layered Structure Chrominance Cb Cr Macroblock Group of Pictures GOP Luminance Y Slice Picture 8 pixels Block Video input 8 pixels Fig 3 Layered structure of AVS China 3 Picture Types Intra Pictures I Pictures Predicted Pictures P Pictures Interpolated Pictures B Pictures Predicted Picture P Picture Prediction of a Macro block or block in the current picture may be from the most recent reference picture or from the second most recent reference picture Fig 4 P Pictures 4 Predicted Picture P Picture In Interlaced Format prediction of the current field may be made from the four most recent fields As shown these fields may be in the current frame most recent frame or second most recent frame Fig 5 Interlaced P Frame prediction 4 Predicted Picture Modes Macroblock modes of P prediction in AVS video Mb Type P Skip P 16 16 P 16 8 P 8 16 P 8 8 Table 1 Modes of P picture 5 Interpolated Picture B Picture A Macro block or block in the current picture is predicted by the average of the macro blocks or blocks in the most recent and future P Pictures that are selected by the motion vector Fig 6 Interpolated Pictures 4 Interpolated Picture B Picture Fig 7 Interlaced B Frame prediction 4 Interpolated Picture Modes Direct Mode Both forward and backward motion vectors of current block are derived from the motion vector of its collocated block Symmetric Mode Forward motion vector needs to be transmitted for each partition of current macroblock while backward motion vector is conducted from the forward motion vector by a symmetric rule Interpolated Picture Modes Fig 8 Example for symmetric mode 5 Intra Picture I Picture Intra frame prediction intra prediction uses decoded information in the current frame as the reference of prediction exploiting statistical spatial dependencies between pixels within a picture Fig 9 Intra prediction 5 Intra Prediction Modes 8 8 Intra prediction a b c d Fig 10 8 8 Intra prediction modes for Luminance component 5 a mode 4 Down right b mode 3 Down left c mode 0 Vertical d mode 1 Horizontal e mode 2 DC e Intra Prediction Modes 4 4 Intra prediction 0 Down left 1 Vertical left 2 Vertical 3 Vertical right 4 Down right 5 Horizontal down 6 Horizontal 7 Horizontal up 8 DC Fig 11 4 4 Intra prediction modes for Luminance 5 Encoder Fig 12 AVS encoder 4 Decoder Fig 13 AVS decoder 4 Results Profile Jizhun Video resolution 704 576 Frames per second 30 File size 57 4 MB QP 0 15 31 47 63 PSNR Y MSE SSIM 61 169 46 614 38 052 31 864 24 365 0 05 1 385 9 062 41 520 253 23 0 99955 0 9875 0 9308 0 8340 0 6742 MSSSIM 3 SSIM 0 9999 0 99995 0 99745 0 99495 0 9778 0 9637 0 9140 0 8362 0 5944 0 4715 Compression ratio 2 2 1 6 6 1 52 1 315 1 1435 1 References 1 2 3 4 5 6 7 8 9 http lea hamradio si s51kq subsample gif Chroma sub sampling gif http dougkerr net pumpkin articles Subsampling pdf Chroma sub sampling article http www ee uta edu Dip Courses EE5359 index html UTA Multimedia Processing Website http www avs org cn reference AVS 20NAB 20Paper 20Final03 pdf AVS Document L Yu et al Overview of AVS video coding standards Signal Processing Image Communication Vol 24 Issue 4 Special Issue on AVS and its Application April 2009 Pages 247 262 S Hu et al Efficient Implementation of Interpolation for AVS Image and Signal Processing 2008 Vol 3 pp 133 138 May 2008 X Jin et al Platform independent MB based AVS video standard implementation Signal Processing Image Communication Vol 24 Issue 4 pp 312 323 April 2009 W Gao et al Context based entropy coding in AVS video coding standard Signal Processing Image Communication Vol 24 Issue 4 pp 263 276 April 2009 Guo An Su et al Low Cost Hardware Sharing Architecture of Fast 1 D Inverse Transforms for H 264 AVC and AVS Applications IEEE Trans on Circuits and Systems II Express Briefs Vol 55 Issue 12 pp 1249 1253 Dec 2008 References contd 10 11 12 13 14 15 16 17 W Gao et al A Real Time Full Architecture for AVS Motion Estimation IEEE Trans on Consumer Electronics Vol 53 Issue 4 pp 1744 1751 Nov 2007 B Tang et al AVS Encoder Performance and Complexity Analysis Based on Mobile Video Communication WRI International conference on Communications and Mobile Computing CMC 09 Vol 3 pp 102 107 68 Jan 2009 X Wang and D Zhao Performance comparison of AVS and H 264 AVC video coding standards J Comput Sci Technol Vol 21 No 3 pp 310 314 May 2006 X Zhang and L Yu An area efficient VLSI architecture for AVS intra frame encoder Visual Communications and Image Processing 2007 Proc of SPIE IS T Electronic Imaging SPIE vol 6508 pp 650822 Jan 29 2007 Special issue on AVS and its Applications Signal Processing Image Communication vol 24 pp 245344 April 2009 W Gao K N Ngan and L Yu Special issue on AVS and its applications Guest editorial Signal Process Image Commun vol 24 Issue 4 pp 245 344 April 2009 R Schafer and T Sikora Digital video coding standards and their role in video communications Proc of the IEEE vol 83 pp 907 924 June 1995 M Liu and Z Wei A fast mode decision algorithm for intra prediction in AVS M video coding Vol 1 International Conference on Wavelet Analysis and Pattern Recognition apos 07 Issue 2 4 pp 326 331 Nov 2007
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