METHODS AND DEVICES FOR PERFORMING SAMPLE ADAPTIVE OFFSET (SAO) FILTERING

WIPO Patent Application WO/2020/002117

A3

The present invention relates to methods for improving the coding efficiency of images subjected to the SAO filtering. According to a first aspect of the invention, there is provided a method of performing sample adaptive offset (SAO) filtering on an image comprising a plurality of image parts, the method comprising: obtaining an edge offset to perform a SAO filtering; applying an edge offset classification to at least one pixel of the image using a predetermined sign method for determining an index of the edge offset; wherein the predetermined sign method is signalled in the bitstream. Correspondingly, there is provided a method of providing an edge offset to perfom a sample adaptive offset (SAO) filtering on an image, the method comprising: computing an edge offset to perform the SAO filtering; selecting a sign method among a plurality of possible sign methods for determining an index of the edge offset; and signalling the selected sign method in the bitstream thereby allowing the edge offset classification to be performed according to the selected sign method.

LAROCHE GUILLAUME (FR)
TAQUET JONATHAN (FR)
GISQUET CHRISTOPHE (FR)
ONNO PATRICE (FR)

PCT/EP2019/066320

February 06, 2020

June 20, 2019

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CANON KK (JP)
CANON EUROPE LTD (GB)

H04N19/80; H04N19/86

WO2013070147A1

2013-05-16

CHIH-MING FU ET AL: "Sample Adaptive Offset in the HEVC Standard", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, US, vol. 22, no. 12, 1 December 2012 (2012-12-01), pages 1755 - 1764, XP011487153, ISSN: 1051-8215, DOI: 10.1109/TCSVT.2012.2221529

SANTARELLI (FR)

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