US 11,943,440 B2
Adjusting quantization/scaling and inverse quantization/scaling when switching color spaces
Bin Li, Beijing (CN); Jizheng Xu, Beijing (CN); and Gary J. Sullivan, Bellevue, WA (US)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed on Aug. 12, 2022, as Appl. No. 17/887,143.
Application 17/887,143 is a continuation of application No. 17/164,964, filed on Feb. 2, 2021, granted, now 11,451,778.
Application 17/164,964 is a continuation of application No. 16/774,547, filed on Jan. 28, 2020, granted, now 10,939,110, issued on Mar. 2, 2021.
Application 16/774,547 is a continuation of application No. 16/126,240, filed on Sep. 10, 2018, granted, now 10,567,769, issued on Feb. 18, 2020.
Application 16/126,240 is a continuation of application No. 15/029,223, granted, now 10,116,937, issued on Oct. 30, 2018, previously published as PCT/CN2014/074197, filed on Mar. 27, 2014.
Prior Publication US 2022/0394263 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 7/12 (2006.01); H04N 9/64 (2023.01); H04N 19/124 (2014.01); H04N 19/136 (2014.01); H04N 19/174 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 9/64 (2013.01); H04N 19/136 (2014.11); H04N 19/174 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11)] 20 Claims
OG exemplary drawing
 
1. In a computer system that implements a video decoder, a method comprising:
receiving encoded data, as part of a bitstream, for a picture of a video sequence; and
decoding the encoded data to reconstruct the picture, including:
determining a color space for a given unit of the picture, including selecting, based on a signal in the encoded data, between a first color space and a second color space, the first color space being RGB and the second color space being YCoCg, wherein the color space for the given unit is determined to be the second color space;
adjusting intermediate quantization parameter (“QP”) values for color components of the second color space according to per component color space adjustment factors, the per component color space adjustment factors adjusting the intermediate QP values for the color components of the second color space by rule for Y, Co, and Cg components, respectively, the per component color space adjustment factors depending on the second color space without signaling of syntax elements that indicate the per component color space adjustment factors; and
decoding the given unit based at least in part on the adjusted intermediate QP values.