Fast intermode decision in H.264/AVC video coding

Wu, Dehao; Pan, Feng; Lim, Kwanghui; Wu, Shiqian; Li, Z.G.; Lin, Xiao; Rahardja, Susanto; Ko, Chi Chung

doi:10.1109/tcsvt.2005.848304

Cited by 252 publications

(151 citation statements)

References 3 publications

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“…Since redundancy always exists in the original video se- quences, it is feasible to utilize either spatial or temporal information to help achieving video compression [17]- [19]. In our paper, mode selection result and RD cost of the colocated MB in the previous or next frame are used as temporal information for the current encoding MB.…”

Section: Mode Selection Relationmentioning

confidence: 99%

Fast H.264/AVC DIRECT Mode Decision Based on Mode Selection and Predicted Rate-Distortion Cost

Jin

Sun

Huang

et al. 2011

IEICE Trans. Inf. & Syst.

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SUMMARYDifferent encoding modes for variable block size are available in the H.264/AVC standard in order to offer better coding quality. However, this also introduces huge computation time due to the exhaustive check for all modes. In this paper, a fast spatial DIRECT mode decision method for profiles supporting B frame encoding (main profile, high profile, etc.) in H.264/AVC is proposed. Statistical analysis on multiple video sequences is carried out, and the strong relationship of mode selection and rate-distortion (RD) cost between the current DIRECT macroblock (MB) and the co-located MBs is observed. With the check of mode condition, predicted RD cost threshold and dynamic parameter update model, the complex mode decision process can be terminated at an early stage even for small QP cases. Simulation results demonstrate the proposed method can achieve much better performance than the original exhaustive ratedistortion optimization (RDO) based mode decision algorithm by reducing up to 56.8% of encoding time for IBPBP picture group and up to 67.8% of encoding time for IBBPBBP picture group while incurring only negligible bit increment and quality degradation.

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Section: Mode Selection Relationmentioning

confidence: 99%

Fast H.264/AVC DIRECT Mode Decision Based on Mode Selection and Predicted Rate-Distortion Cost

Jin

Sun

Huang

et al. 2011

IEICE Trans. Inf. & Syst.

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“…To reduce the complexity of the VBSME algorithm, several fast mode decision algorithms have been proposed [2][3][4]. These previous works are efficient at decreasing the redundant candidate modes with the sacrifice of picture quality.…”

Section: Introductionmentioning

confidence: 99%

A Novel Spiral-Type Motion Estimation Architecture for H.264/AVC

Hirai

Song²,

Liu³

et al. 2010

JSTS:Journal of Semiconductor Technology and Science

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Abstract-New features of motion compensation, such as variable block size and multiple reference frames are introduced in H.264/AVC. However, these new features induce significant implementation complexity increases. In this paper, an efficient architecture for spiral-type motion estimation is proposed. First, we propose a hardware-friendly spiral search order. Then, an efficient processing element (PE) architecture for ME is proposed to achieve the proposed search order. The improved PE enables one-pixel-move of the reference pixel data to top, bottom, right, and left by four ports for input and output. Moreover, the parallel calculation architecture to calculate all block size with the SAD of 4x4 is introduced in the proposed architecture. As the result of hardware implementation, the hardware cost is about 145k gates. Maximum clock frequency is 134 MHz in the case of FPGA (Xilinx Vertex5) implementation.

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“…Values or distribution of quantized DCT coefficients are employed in [4]- [6] as an indicator of the homogeneity of coding blocks. The algorithm in [7] determines if a macroblock is homogenous by its edge map using the Sobel operator. A non-homogeneous block is split into smaller blocks until it reaches 4×4.…”

Section: Introductionmentioning

confidence: 99%

Using H.264 coded block patterns for fast inter-mode selection

Chen

Yang

2008

2008 IEEE International Conference on Multimedia and Expo

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The support of variable block-sizes, though significantly improves the compression efficiency, imposes a big computational challenge on an H.264 encoder. In this paper, we present a new fast inter-mode decision algorithm based on the coded block pattern (CBP). Specifying which blocks within a macroblock are uncoded, CBP is a good indicator of block-matching accuracy and can be used to reduce the rate-distortion calculation required for mode selection. Experimental results show that the proposed method achieves more than 50% reduction in computation time relative to the exhaustive mode search with negligible degradation in visual quality. Other merits of the proposed method include 1) no extra computation is needed for obtaining CBP; 2) no ad-hoc threshold is involved in the algorithm; 3) in contrast to the previous early-skip algorithm that yields very limited improvement for highactivity videos, the proposed method is highly reliable for various video characteristics.

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Fast intermode decision in H.264/AVC video coding

Cited by 252 publications

References 3 publications

Fast H.264/AVC DIRECT Mode Decision Based on Mode Selection and Predicted Rate-Distortion Cost

Fast H.264/AVC DIRECT Mode Decision Based on Mode Selection and Predicted Rate-Distortion Cost

A Novel Spiral-Type Motion Estimation Architecture for H.264/AVC

Using H.264 coded block patterns for fast inter-mode selection

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