Lossless Intra Coding in HEVC with Adaptive 3-Tap Filters

Date

2016-08-05

Author

Alvar, Saeed Ranjbar
Kamışlı, Fatih

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In pixel-by-pixel spatial prediction methods for lossless intra coding, the prediction is obtained by a weighted sum of neighboring pixels. The proposed prediction approach in this paper uses a weighted sum of three neighbor pixels according to a two-dimensional correlation model. The weights are obtained after a three step optimization procedure. The first two stages are offline procedures where the computed prediction weights are obtained offline from training sequences. The third stage is an online optimization procedure where the offline obtained prediction weights are further fine-tuned and adapted to each encoded block during encoding using a rate-distortion optimized method and the modification in this third stage is transmitted to the decoder as side information. The results of the simulations show average bit rate reductions of 12.02% and 3.28% over the default lossless intra coding in HEVC and the well-known Sample-based Angular Prediction (SAP) method, respectively.

Subject Keywords

Video coding, Lossless coding, Intra prediction

URI

https://hdl.handle.net/11511/56015

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Department of Electrical and Electronics Engineering, Conference / Seminar

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On lossless intra coding in HEVC with 3-tap filters Alvar, Saeed Ranjbar; Kamışlı, Fatih (2016-09-01) This paper presents a pixel-by-pixel spatial prediction method for lossless intra coding within High Efficiency Video Coding (HEVC). Previous pixel-by-pixel spatial prediction methods use only two neighboring pixels for prediction, based on the angular projection idea borrowed from block-based intra prediction in lossy coding, or are based on ad hoc methods applied in some intra modes. This paper explores a pixel-by-pixel prediction method which uses three neighboring pixels for prediction according to a tw...
LOSSLESS COMPRESSION IN HEVC WITH INTEGER-TO-INTEGER TRANSFORMS Kamışlı, Fatih (2016-09-23) Many approaches have been proposed to support lossless coding within video coding standards that are primarily designed for lossy coding. The simplest approach is to just skip transform and quantization and directly entropy code the prediction residual, which is used in HEVC version 1. However, this simple approach is inefficient for compression. More efficient approaches include processing the residual with DPCM prior to entropy coding. This paper explores an alternative approach based on processing the re...
LOSSLESS INTRA CODING IN HEVC WITH INTEGER-TO-INTEGER DST Kamışlı, Fatih (2016-09-02) It is desirable to support efficient lossless coding within video coding standards, which are primarily designed for lossy coding, with as little modification as possible. A simple approach is to skip transform and quantization, and directly entropy code the prediction residual, but this is inefficient for compression. A more efficient and popular approach is to process the residual block with DPCM prior to entropy coding. This paper explores an alternative approach based on processing the residual block wi...
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INTRA PREDICTION BASED ON STATISTICAL MODELING OF IMAGES Kamışlı, Fatih (2012-11-30) Intra prediction is an important part of intra-frame coding. A number of approaches have been proposed to improve intra prediction including a general linear prediction approach in which a weighted sum of all available neighbor pixels is used to predict each block pixel. An important part of this approach is the determination of the used weights. One method to determine the weights is to use the least-squares solution of an overdetermined linear system of weights. In this paper, we present an alternative ap...

Citation Formats

S. R. Alvar and F. Kamışlı, “Lossless Intra Coding in HEVC with Adaptive 3-Tap Filters,” 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56015.