Fast Macroblock Intra and Inter Modes Selection for H. 264/AVC

Arsura, E.; Vecchio, L. Del; Lancini, R.; Nisti, L.

doi:10.1109/icme.2005.1521439

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…The smoothness of a macroblock is estimated, and 16 × 16 intraprediction is chosen when the block is smooth while 4 × 4 intraprediction is performed in the other case. An early decision to skip intraprediction has been proposed by several researchers as another efficient method for fast intraprediction [3,[23][24][25][26]. In the reports by the researchers, the results of interprediction (i.e., motion estimation) is often used as the criterion for the decision.…”

Section: Introductionmentioning

confidence: 99%

Early Termination and Pipelining for Hardware Implementation of Fast H.264 Intraprediction Targeting Mobile HD Applications

Jung

Jin

Lee

2008

EURASIP J. Adv. Signal Process.

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Recommended by Liang-Gee Chen H.264/AVC adopts aggressive compression algorithms at the cost of increased computational complexity. To speed up the H.264/AVC intraframe coding, this paper proposes two novel techniques: early termination and pipelined execution. In P slices, intra 4 × 4 and 16× 16 predictions are early terminated with the threshold determined by the cost of motion estimation. In I slices, intra 4×4 prediction is early terminated with the threshold derived from intra 16×16 prediction. The threshold function is chosen as a monotonically decreasing linear function with its optimal coefficients determined by experiments. For the pipelined execution of 4×4 intrapredictions, the processing order of 4×4 blocks is changed to reduce the dependencies between consecutively processed blocks. In I slices, computation for 4 × 4 intraprediction is reduced by 19 percent with the proposed early termination. In P slices, computations for 4 × 4 and 16 × 16 intrapredictions are reduced by more than 81 and 91 percents, respectively. The pipelined execution reduces the computation time by 41 percent. In spite of the speed-up by the proposed methods, degradation in ratedistortion performance is negligible. The proposed pipelined execution is integrated with other H.264/AVC hardware accelerators and fabricated as an SoC using Dongbu 0.13 μm technology.

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Section: Introductionmentioning

confidence: 99%

Early Termination and Pipelining for Hardware Implementation of Fast H.264 Intraprediction Targeting Mobile HD Applications

Jung

Jin

Lee

2008

EURASIP J. Adv. Signal Process.

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“…A number of efforts have been made to reduce the computational complexity of H.264/AVC by using various fast mode decision algorithms, such as fast SKIP mode decision [8], fast inter-mode decision [9][10][11], fast intra-mode decision [12][13][14][15], and the combination of the above [8,[16][17][18][19]. All the existing methods are based on the temporal correlation between current MB and its matching MB in the previous frame, and the spatial correlation between current MB and its neighboring MBs in the current frame.…”

Section: Introductionmentioning

confidence: 99%

Scalable Fast Rate-Distortion Optimization for H.264/AVC

Pan

Lin

2006

EURASIP J. Adv. Signal Process.

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The latest H.264/AVC video coding standard aims at significantly improving compression performance compared to all existing video coding standards. In order to achieve this, variable block-size inter-and intra-coding, with block sizes as large as 16 × 16 and as small as 4 × 4, is used to enable very precise depiction of motion and texture details. The Lagrangian rate-distortion optimization (RDO) can be employed to select the best coding mode. However, exhaustively searching through all coding modes is computationally expensive. This paper proposes a scalable fast RDO algorithm to effectively choose the best coding mode without exhaustively searching through all the coding modes. The statistical properties of MBs are analyzed to determine the order of coding modes in the mode decision priority queue such that the most probable mode will be checked first, followed by the second most probable mode, and so forth. The process will be terminated as soon as the computed rate-distortion (RD) cost is below a threshold which is content adaptive and is also dependent on the RD cost of the previous MBs. By adjusting the threshold we can choose a good tradeoff between timesaving and peak signal-to-noise (PSNR) ratio. Experimental results show that the proposed fast RDO algorithm can drastically reduce the encoding time up to 50% with negligible loss of coding efficiency.

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“…In H.264 the rate-distortion (R-D) optimization is the main complexity source. [8]. Architectures and designs for H.264/AVC intra frame coders etc are considered.…”

Section: Introductionmentioning

confidence: 99%

The Intra Prediction in H.264

Khan

Jamal

Novel Algorithms and Techniques in Telecommunications, Automation and Industrial Electronics

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A multidirectional spatial prediction method to reduce spatial redundancy by using neighbouring samples as a prediction for the samples in a block of data to be encoded is already included in the H.264/AVC. The spatial prediction may be performed on sample wise DPCM instead of the block-based manner as used in the current H.264/AVC standard. The block structure is retained for the residual difference entropy coding process. There are two approaches of spatial prediction i.e. sample prediction and block prediction. The Second approach is more efficient. It is being introduced into the H.264/AVC standard as an enhancement. This paper is a brief survey of what is important in intra prediction and with some experimental work. The work involves running of the code of H.264.

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Fast Macroblock Intra and Inter Modes Selection for H. 264/AVC

Cited by 4 publications

References 6 publications

Early Termination and Pipelining for Hardware Implementation of Fast H.264 Intraprediction Targeting Mobile HD Applications

Early Termination and Pipelining for Hardware Implementation of Fast H.264 Intraprediction Targeting Mobile HD Applications

Scalable Fast Rate-Distortion Optimization for H.264/AVC

The Intra Prediction in H.264

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