On lossless intra coding in HEVC with 3-tap filters

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2016-09-01
Alvar, Saeed Ranjbar
Kamışlı, Fatih
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 two-dimensional correlation model, and develops a unified prediction algorithm applied in all intra modes with optimized prediction weights and neighbors. The prediction weights for each intra mode are determined from a two-stage offline optimization algorithm and a number of aspects are analyzed to determine a good trade-off between complexity and coding gain. The method is implemented in the HEVC reference software and experimental results show that it can achieve an average 1134% bitrate reduction over the default lossless intra coding in HEVC, which is among the best reported results. The method decreases average decoding time by 12.7% while increasing average encoding time by 9.7%.
SIGNAL PROCESSING-IMAGE COMMUNICATION

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Citation Formats
S. R. Alvar and F. Kamışlı, “On lossless intra coding in HEVC with 3-tap filters,” SIGNAL PROCESSING-IMAGE COMMUNICATION, pp. 252–262, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36582.