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A fast adaptive ME algorithm based on H.264

International Workshop on Multimedia Content Analysis and Mining

作者： Liu, Zhisheng Peng, Yuhua Shandong Univ Sch Informat Sci & Engn Jinan 250100 Peoples R China

ISBN: (纸本)9783540734161

This paper proposes a new fast adaptive motion estimation algorithm based on H.264. It utilizes the statistics of video sequence and the correlations of SADs in the space to early terminate the search, determines the search pattern according to the block's local motion activity, and proposes a new synthetic diamond search pattern. Compared to fast full search, the PSNR is just 0.017db lower and bitrates is 0.45% higher while the speed is 15 times up.

关键词： fast adaptive motion estimation block matching algorithm stationary block

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VLSI implementation of genetic four-step search for block matching algorithm

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2003年第4期49卷 1474-1481页

作者： Wu, A So, S City Univ Hong Kong Dept Elect Engn Hong Kong Peoples R China

Genetic algorithm is well known for searching global optimum. It has been demonstrated its capability for block Motion Estimation with performance close to exhaustive full search using fewer search steps. However, it is computational expensive. A Genetic Four-Step Search is developed to alleviate the problem. It has a mean square error performance close to full search and much computational efficient than the traditional genetic algorithm. A FPGA implementation of the proposed algorithm is realized. The architecture is simple and suitable for valuable applications in the development of low cost multimedia products.

关键词： VLSI block matching algorithm FPGA

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Full search based fast block matching algorithm with efficient matching order in motion estimation

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IEICE TRANSACTIONS ON COMMUNICATIONS 2003年第3期E86B卷 1191-1195页

作者： Kim, JN Byun, S Ahn, B KBS Tech Res Inst Yongdeungpo Gu Seoul 150790 South Korea K JIST Dept Mechatron Puk Gu Kwangju 500712 South Korea

In this letter we propose a new fast matching algorithm that has no degradation of predicted images such as found in the conventional full search (FS) algorithm, so as to reduce the amount of computation of the FS algorithm for motion estimation in real-time video coding applications. That is, our proposing algorithm reduces only unnecessary computations in the process of motion estimation without decreasing the prediction quality compared to the conventional FS algorithm. The computational reduction comes from rapid elimination of impossible motion vectors. In comparison to the FS algorithm, we obtained faster elimination of inappropriate candidate motion vectors using efficient matching units based on image complexity. Experimentally, we demonstrated that the unnecessary computations were removed by about 30% as compared to the other fast FS algorithms.

关键词： motion estimation block matching algorithm fast full search adaptive matching

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An efficient diamond search with large kite search patterns for fast block motion estimation

An efficient diamond search with large kite search patterns ...

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SICE-ICASE International Joint Conference

作者： Lee, Hwal-Suk Jung, Jik-Han Park, Dong-Jo Korea Adv Inst Sci & Technol Dept Elect Engn & Comp Sci 373-1 Guseong Dong Taejon 305701 South Korea

ISBN: (纸本)9788995003848

One of the well known block-matching motion estimation (BMME) algorithm is the diamond search (DS). Two improved versions of DS in terms of speed are known to be the cross-diamond search (CDS) and the cross-diamond-hexagonal search (CDHS). Based on these methods, our proposed algorithm employs a new scheme to find small motion vectors with the smallest checking points and proposes two novel search patterns designed to reduce checking points efficiently for large motion vectors. The speed improvement of the proposed algorithm can be up to 61% faster than the diamond search (DS) algorithm, 44% faster than the CDS, and 25% faster than the CDHS while providing similar prediction accuracies.

关键词： block matching algorithm motion estimation modified large diamond-shaped pattern

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Digital image stabilization using simple estimation of the rotational and translational motion

Digital image stabilization using simple estimation of the r...

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Conference on Acquisition, Tracking, and Pointing XIX

作者： Seok, HD Lyou, J Agcy Def Dev Taejon 205600 South Korea

ISBN: (纸本)0819457957

This paper presents a rotational motion estimation and correction technique for digital image stabilization. An equivalent rotation model is derived so as to accommodate a combined rotational and the translational motion. Based on this model, the rotation center and angle are estimated, and followed by the motion compensation. The suggested estimation algorithm does not require the time consuming parameter searching, while showing a comparable performance to the previous ones.

关键词： digital image stabilization motion estimation block matching algorithm peak signal to noise ratio

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Scalable complexity-distortion model for fast motion estimation

Scalable complexity-distortion model for fast motion estimat...

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Conference on Visual Communications and Image Processing 2005

作者： Yi, XQ Ling, N Santa Clara Univ Dept Comp Engn Santa Clara CA 95053 USA

ISBN: (纸本)0819459763

Recently established international video coding standard H.264/AVC and the upcoming standard on scalable video coding (SVC) bring part of the solution to high compression ratio requirement and heterogeneity requirement. However, these algorithms have unbearable complexities for real-time encoding. Therefore, there is an important challenge to reduce encoding complexity, preferably in a scalable manner. Motion estimation and motion compensation techniques provide significant coding gain but are the most time-intensive parts in an encoder system. They present tremendous research challenges to design a flexible, rate-distortion optimized, yet computationally efficient encoder, especially for various applications. In this paper, we present a scalable motion estimation framework for complexity-distortion consideration. We propose a new progressive initial search (PIS) method to generate an accurate initial search point, followed by a fast search method, which can greatly benefit from the tighter bounds of the PIS. Such approach offers not only significant speedup but also an optimal distortion performance for a given complexity constrain. We analyze the relationship between computational complexity and distortion (C-D) through probabilistic distance measure extending from the complexity and distortion theory. A configurable complexity quantization parameter (Q) is introduced. Simulation results demonstrate that the proposed scalable complexity-distortion framework enables video encoder to conveniently adjust its complexity while providing best possible services.

关键词： complexity-distortion optimal model motion estimation block matching algorithm BMA dynamic threshold complexity quantization parameter scalable video coding

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A simple estimation of the rotation parameter for the 2-axes stabilization system

A simple estimation of the rotation parameter for the 2-axes...

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19th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2004)

作者： Kim, DN Kim, KH Jung, TY Kim, DG Kyungpook Natl Univ Sch Elect Engn & Comp Sci Taegu 702701 South Korea Agcy Def Dev Taejon 300600 South Korea

The recent sight system requires high stabilization functions for the longer range of observation and the higher kill probability. To this end, it is necessary to compensate rotational disturbances which are not stabilized with the conventional 2-axes stabilization system. This paper proposes a simple method on the rotational motion estimation for the stabilization of the sight system.

关键词： digital image stabilization block matching algorithm motion estimation

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Interpolation-free subpixel refinement for block-based motion estimation

Interpolation-free subpixel refinement for block-based motio...

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Conference on Visual Communications and Image Processing 2004

作者： Chiew, TK Chung-How, JTH Bull, DR Canagarajah, CN Univ Bristol Bristol BS8 1UB Avon England

ISBN: (纸本)0819452114

This paper proposes a low-complexity sub-pixel refinement to motion estimation based on full-search block matching algorithm (BMA) at integer-pixel accuracy. This algorithm eliminates the need to produce interpolated reference frames, which is may be too memory- and processor-intensive, for some real-time mobile applications. The algorithm assumes the BMA is done at pixel resolution and the (sum-of-absolute-differences) SADs of the candidate motion vector and its neighbouring vectors are available for each block. The proposed method than models the SAD distribution around the candidate motion vector and its neighbouring points. Actual minimum point at sub-pixel resolution is then computed according to the model used. 3 variations of the parabolic model are considered and simulations using the H.263 standard encoder on several test sequences reveal an improvement of 1.0 dB over integeraccuracy motion estimation. Albeit its simplicity, some test cases come close to the results obtained by actual interpolated reference frames.

关键词： motion estimation sub-pixel block matching algorithm

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A DSP architecture for motion estimation accelerating

A DSP architecture for motion estimation accelerating

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International Symposium on Intelligent Multimedia, Video and Speech Processing

作者： Zhang, C Yang, K Mai, SP Wang, ZH Tsing Hua Univ Dept Elect Engn Beijing 100084 Peoples R China

ISBN: (纸本)0780386876

Motion estimation (ME) consumes a majority of computation capacity of DSP in video compression application. A modified DSP architecture to accelerate ME algorithms is presented in this paper. The proposed SIMD and VLIW architecture is a trade-off between ASIC implementation and DSP implementation of ME, which can perform subtract, absolute and add (SAA) operation on 8 pixels and fetch 8 new pixels from memory at the same time. Flexible align addressing mode is provided to support efficient and continuous SAA operation on video stream. The DSP is estimated 20 times faster than SISD architecture to perform ME algorithms.

关键词： video coding digital signal processing chips motion estimation reduced instruction set computing parallel processing motion compensation parallel machines application specific integrated circuits digital arithmetic RISC processor single instruction multi data motion compensation block matching algorithm DSP architecture motion estimation acceleration video compression SIMD architecture VLIW architecture ASIC implementation subtract operations absolute operations add operations pixel SAA operations align addressing mode video streams

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Fast motion estimation based on binary edge information

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IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 2003年第8期E86D卷 1456-1458页

作者： Park, WB Kwak, NJ Song, YJ Ahn, JH Chungbuk Natl Univ Dept Comp & Commun Engn Cheongju Chunbuk South Korea

In this paper, we propose a fast full-search block matching algorithm for motion estimation, based on binary edge information. The binary edge information allows a faster search by reducing the computational complexity. It also reduces error, which is generated by the block located on the boundary of moving objects. After we transform the input image into an edge-based image using Sobel masks, we convert the result into a binary edge image using median-cut quantization. We then perform block matching using the binary edge image. If there exists blocks such that the error of the binary block matching exceeds threshold, we only perform edge intensity-based block matching within those blocks. We improve computational efficiency by eliminating an unnecessary searching process in no-motion regions. Simulation results have shown that the proposed method reduces the computational complexity and provides similar PSNR performance to the Full Search block matching algorithm (FS-BMA).

关键词： Binary edge block matching algorithm Motion estimation Video coding

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