Fast H.264 Intra-prediction mode selection using joint spatial and transform domain features

Kim, Changsung; Shih, Hsuan-Huei; Kuo, C.-C. Jay

doi:10.1016/j.jvcir.2005.05.002

Cited by 36 publications

(31 citation statements)

References 7 publications

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“…The Hadamard transform is an orthogonal transform that has been used in numerous image coding applications [7], [8]. The transform matrix of dimension 2 k for k ∈ N is given by the following recursive formula…”

Section: The Hadamard Transformmentioning

confidence: 99%

Wyner-Ziv Video Coding using Hadamard Transform and Deep Learning

Kouma¹,

Söderström²

2016

ijacsa

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Abstract-Predictive schemes are current standards of video coding. Unfortunately they do not apply well for lightweight devices such as mobile phones. The high encoding complexity is the bottleneck of the Quality of Experience (QoE) of a video conversation between mobile phones. A considerable amount of research has been conducted towards tackling that bottleneck. Most of the schemes use the so-called Wyner-Ziv Video Coding Paradigm, with results still not comparable to those of predictive coding. This paper shows a novel approach for Wyner-Ziv video compression. It is based on the Reinforcement Learning and Hadamard Transform. Our Scheme shows very promising results.

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Section: The Hadamard Transformmentioning

confidence: 99%

Wyner-Ziv Video Coding using Hadamard Transform and Deep Learning

Kouma¹,

Söderström²

2016

ijacsa

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“…Therefore, a good prediction could be attained if we predict the pixels using their neighboring pixels that are in the same directional correlation of the block. Several algorithms exist to get the directional correlation of the block [9][10][11][12][13][14][15][16][17][18][19]. However, these algorithms may increase the bit rate or may not perform sufficient complexity reduction due to the required pre-calculations and/or may affect heavily the PSNR degradation.…”

Section: Fast Intramode Selection Algorithmmentioning

confidence: 99%

“…To reduce this complexity, fast intraprediction algorithms have been proposed [9][10][11][12][13][14][15][16][17][18][19]. Pan et al [13] proposed a fast mode decision scheme with a pre-processing technique, which measures the edge direction of a given block so as to reduce the number of probable intraprediction modes and thus diminishes complexity.…”

mentioning

confidence: 99%

Gravity direction-based ultra-fast intraprediction algorithm for H.264/AVC video coding

Elyousfi

2011

SIViP

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The H.264/AVC video coding standard uses in intraprediction, 9 directional modes for 4 × 4 and 8 × 8 luma blocks, and 4 directional modes for 16 × 16 luma macroblocks, and 8 × 8 chroma blocks. The use of the variable block size and multiple modes in intraprediction makes the intracoding of H.264/AVC very efficient compared with other compression standards; however, computational complexity is increased significantly. In this paper, we propose a fast mode selection algorithm for intracoding. This algorithm is based on the vector of the block's gravity center whose direction is used to select the best candidate prediction mode for intracoding. On this basis, only a small number of intraprediction modes are chosen for rate distortion optimization (RDO) calculation. Different video sequences are used to test the performance of proposed method. The simulation results show that the proposed algorithm increases significantly the speed of intracoding with negligible loss of peak signal-to-noise ratio quality.

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“…The difference of mode selection between pure encoder (Yu et al, 2005;Sim and Kim, 2005;Kim et al, 2006) and re-encoder in transcoder (Kalva and Petljanski, 2006) is that there are many useful information can be utilized in transcoder, including residual data, macroblock mode, etc. As far as authors' knowledge, there has been no paper discussing about intraframe mode selection in downsizing transcoder based on H.264.…”

Section: Introductionmentioning

confidence: 99%

Intra mode selection in downsizing video transcoder based on H.264

Liu

Wang

2009

Int J Imaging Syst Tech

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An intra mode selection scheme is proposed in this work, which supports both downsizing transcoding and re-quantization transcoding simultaneously. In the proposal, a total number of nonzero coefficients in precoded frame is used as criterion and a thresholding method is applied to select intra macroblock mode in reencoder. To calculate this threshold, which is related to re-quantization parameter (denoted as Q r ), we propose a Th_I-Q r model which includes direct method and percentage I16MB method. In the former, an exponent model is proposed to describe relationship between the threshold and the Q r ; while in the latter, the threshold Th_I is converted into percentage of macroblocks with I16MB mode in the downsized frame (denoted as per_16), and relationship between the per_16 and the Q r is also modeled as an exponent function. Then the two exponent models are all converted into linear regression model, and least square estimation is used to estimate the parameters of the models. Furthermore, if I4MB mode is selected for one macroblock, the intra prediction modes in precoded frame are utilized to select prediction mode for every 4 3 4 block of the macroblock in downsized frame to reduce computational complexity. We compared rate distortion performance and computational complexity of the proposed method with rate-distortion optimization method. Simulation results demonstrate that on the precondition of compression performance of the proposal being close to the results of the rate-distortion optimization method, the proposed method can save up to 30 and 80% in total encoding time and mode decision time, respectively. V

show abstract

Fast H.264 Intra-prediction mode selection using joint spatial and transform domain features

Cited by 36 publications

References 7 publications

Wyner-Ziv Video Coding using Hadamard Transform and Deep Learning

Wyner-Ziv Video Coding using Hadamard Transform and Deep Learning

Gravity direction-based ultra-fast intraprediction algorithm for H.264/AVC video coding

Intra mode selection in downsizing video transcoder based on H.264

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