US 12,081,804 B2
Method and apparatus for deblocking filtering a block of pixels
Christophe Gisquet, Acigne (FR); Jonathan Taquet, Talensac (FR); Patrice Onno, Rennes (FR); and Guillaume Laroche, Saint Aubin d'Aubigne (FR)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 2, 2021, as Appl. No. 17/541,058.
Application 17/541,058 is a continuation of application No. 16/650,773, granted, now 11,284,116, previously published as PCT/EP2018/076338, filed on Sep. 27, 2018.
Claims priority of application No. 1716537 (GB), filed on Oct. 9, 2017; and application No. 1810671 (GB), filed on Jun. 28, 2018.
Prior Publication US 2022/0094989 A1, Mar. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/82 (2014.01); H04N 19/117 (2014.01); H04N 19/14 (2014.01); H04N 19/176 (2014.01); H04N 19/182 (2014.01); H04N 19/86 (2014.01)
CPC H04N 19/82 (2014.11) [H04N 19/117 (2014.11); H04N 19/14 (2014.11); H04N 19/176 (2014.11); H04N 19/182 (2014.11); H04N 19/86 (2014.11)] 6 Claims
OG exemplary drawing
 
1. A method of deblocking filtering for an image, the method comprising:
obtaining a first parameter value for deblocking filtering based on a second parameter value; and
obtaining a filtered sample value by performing deblocking filtering on a sample in a block of samples by using the first parameter value, the filtered sample value being limited by a range based on the first parameter value,
wherein obtaining the first parameter value comprises:
obtaining the second parameter value based on a quantization parameter value for the block of samples; and
obtaining the first parameter value by adding an offset to the second parameter value, obtaining a value N using a parameter value indicating a bit-depth of the image, and bit-shifting a result of the adding to right by N bits, wherein N is a positive integer in a case where the bit-depth of the image is 8.