Intra prediction with spatial gradients and multiple reference lines

Matsuo, Shohei; Takamura, S.; Yashima, Yoshiyuki

doi:10.1109/pcs.2009.5167430

Cited by 9 publications

(21 citation statements)

References 5 publications

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“…In general, the gradient mode has increasing or decreasing prediction values according to the distance from the reference pixel [6] . In the proposed scheme, the simplified gradient modes are introduced, which use only sixteen gradient modes.…”

Section: Additional Intra Prediction Modesmentioning

confidence: 99%

“…Intra prediction reduces the spatial redundancy by using the pixels from the already coded neighboring blocks [5] . Although intra prediction in H.264/AVC shows high coding efficiency, the compression ratio of intra prediction is lower than that of inter prediction [6] .…”

Section: ⅰ Introductionmentioning

confidence: 99%

“…Many studies have been done to improve the coding efficiency of intra prediction [6][7][8][9][10][11][12][13] . Tsukuba et al [7] selected one of five predictor sets consisting of nine prediction modes on each macroblock (MB).…”

Section: ⅰ Introductionmentioning

confidence: 99%

“…Ye et al [9] proposed enhanced intra prediction methods using nine BIP modes that are frequently used, directional transforms, and improved residual coefficient coding in CAVLC. Intra prediction with a spatial gradient and multiple reference lines is proposed [6] . Tian et al [10] used temporal-spatial prediction for intra coding.…”

Section: ⅰ Introductionmentioning

confidence: 99%

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Intra Prediction Algorithm Using Adaptive Modes

Lim¹,

Lee²,

Kim³

et al. 2013

The Journal of Korea Information and Communications Society

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Key Words : adaptive mode selection, combined intra modes, simplified gradient modes, H.264/AVC, intra prediction ABSTRACT H.264/AVC has shown high coding efficiency by using various coding tools, including intra and inter prediction. However, there are still many more redundancy components in intra prediction than in inter prediction.In this paper, a novel intra prediction method is proposed with adaptive mode selection. The combined intra prediction modes and simplified gradient modes are added in order to refine the directional feature and gradation region. Suitable modes are selected according to the neighboring blocks that provide a high compression rate and lower computational complexity. The improvement of the proposed method is 1.96% in terms of the bitrate, 0.25 dB in PSNR, and 1.72 times in terms of the computational complexity.

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Section: Additional Intra Prediction Modesmentioning

confidence: 99%

Section: ⅰ Introductionmentioning

confidence: 99%

Section: ⅰ Introductionmentioning

confidence: 99%

Section: ⅰ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Intra Prediction Algorithm Using Adaptive Modes

Lim¹,

Lee²,

Kim³

et al. 2013

The Journal of Korea Information and Communications Society

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“…An IP method using multiple reference lines in a reconstructed region is presented in [3], which makes use of the distant samples as well as the nearby ones. Liu et al [4] introduced the use of two windows of reconstructed pixels from two previous frames to train linear prediction coefficients at both encoder and decoder.…”

Section: Introductionmentioning

confidence: 99%

Position dependent linear intra prediction for image coding

Zhang

Gao

2010

2010 IEEE International Conference on Image Processing

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Intra prediction has been efficiently employed in block based image/video coding to remove the spatial redundancy. In this paper, we propose a position dependent linear intra prediction (PDLIP) approach to further improve the accuracy of prediction. Specifically, for each prediction direction, the prediction of each sample within a target block is calculated as a linear weighted summation of the surrounding spatial neighboring samples in a fixed window. And the prediction coefficients are adaptively derived in the encoding process using the least square estimation method. The derivation process utilizes the original data of the previous image with the same prediction direction after ratedistortion selection to adaptively adjust to the video contents and local context within one block. To alleviate the computation burden of decoding, these prediction coefficients are sent to decoder as side information. Experimental results demonstrate that the proposed PDLIP can achieve a significant coding gain with a slight increase in computational complexity at encoder.

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