Block Based Extra/Inter-Polating Prediction for Intra Coding

Shiodera, Taichiro; Tanizawa, Akiyuki; Chujoh, Takeshi

doi:10.1109/icip.2007.4379617

Cited by 20 publications

(7 citation statements)

References 1 publication

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“…There are three groups of strategies for improvement: a method to change (a) the generation of the prediction signals [2][3][4][5][6], (b) the block partition of PU [7], and ( c) the transformation using the information of the prediction [8].…”

Section: Conventional Methods For Improvementmentioning

confidence: 99%

Intra angular prediction with weight function and modification filter

Matsuo

Takamura

Shimizu

2013

2013 Picture Coding Symposium (PCS)

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Standardization of a new video coding standard, HighEfficiency Video Coding (HEVC version 1), has been completed and its compression ratio is twice as much as that of H.264/AVC under the condition of the same subjective quality. In HEVC, many coding tools contribute to the improvement of the coding efficiency. One example is the intra angular prediction mode that has finer prediction directions compared to H.264/AVC. In this paper, we propose two modified intra angular prediction methods: (A) reference pixels that are closer to the predicted pixels than the original reference pixels are exploited, and (B) a blending filter similar to the filter used in the intra DC mode is enhanced and applied. In the proposed method, the predicted signals of the angular prediction mode are generated by blending the predicted signals of the selected angular prediction mode and those of the other mode which has the opposite prediction direction. The overall average coding gain against the HM9.0.1 RExt 1.0 anchor was about 0.5% for the combined method. The maximum coding gain was about 1.0%. The average encoding and decoding run-times were 104.1 % and 103.4%, respectively.

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Section: Conventional Methods For Improvementmentioning

confidence: 99%

Intra angular prediction with weight function and modification filter

Matsuo

Takamura

Shimizu

2013

2013 Picture Coding Symposium (PCS)

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“…In [6], an extra/interpolating prediction method was proposed for H.264/AVC. By changing the sub-block processing order in macroblock (MB), some sub-blocks are predicted using not only the reference pixels on the upper and/or left side but also ones on the bottom and/or right side of each subblock.…”

Section: Introductionmentioning

confidence: 99%

Intra prediction with adaptive CU processing order in HEVC

Zheng

Yuan

et al. 2014

2014 IEEE International Conference on Image Processing (ICIP)

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The High Efficiency Video Coding (HEVC) utilizes Z-scan order to process coding units (CUs). For intra prediction, this order cannot fully exploit the spatial correlation between adjacent CUs. After transform and quantization, the residue still contains lots of energy along edges which consumes many bits for compression. To effectively reduce the residue energy along edges, a novel intra prediction approach is proposed, where the CU processing order is changed adaptively. Two additional orders are introduced in this paper besides traditional Z-scan order. Up to 1.9% bit saving is achieved in our experiments on HEVC test model. We also propose two fast order selection algorithms and the observed gains are obtained with 27% and 2% encoding time increase compared to HEVC, respectively.

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“…Motivated by this fact, a spatial version of the bi-directional prediction method was proposed for intra-frame video coding [5]. In this method, some intra prediction modes are modified from those of H.264/AVC to use the reference pels located at lower and/or right boundaries of the current block.…”

Section: Introductionmentioning

confidence: 99%

Interpolative intra prediction by adapting processing order in block-based image coding

Matsuda

Ohtake

Mochizuki

et al. 2013

2013 IEEE International Conference on Image Processing

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This paper proposes a novel intra prediction method which can be used with block-based image coding algorithms typically using DCT. In this method, a non-directional and several directional prediction modes are adaptively selected on a block-by-block basis. The non-directional prediction mode produces smooth image values from the reference pels based on mean value coordinates. For the directional modes, the angular prediction used in HEVC is extended to enable interpolative prediction as far as possible. In both cases, the proposed method has no restrictions on positions of the reference pels. This feature allows adaptation of processing order for the blocks. Simulation results indicate that the proposed method outperforms the angular prediction in terms of PSNR of predicted images when almost the same amount of side-information is assigned.

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Block Based Extra/Inter-Polating Prediction for Intra Coding

Cited by 20 publications

References 1 publication

Intra angular prediction with weight function and modification filter

Intra angular prediction with weight function and modification filter

Intra prediction with adaptive CU processing order in HEVC

Interpolative intra prediction by adapting processing order in block-based image coding

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