US 12,244,867 B2
Quantization parameter signaling
Fangjun Pu, Sunnyvale, CA (US); Taoran Lu, Santa Clara, CA (US); Peng Yin, Ithaca, NY (US); and Sean Thomas McCarthy, San Francisco, CA (US)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed on Nov. 10, 2023, as Appl. No. 18/506,828.
Application 18/506,828 is a continuation of application No. 17/613,801, granted, now 11,856,232, previously published as PCT/US2020/034758, filed on May 27, 2020.
Claims priority of provisional application 62/853,352, filed on May 28, 2019.
Prior Publication US 2024/0080489 A1, Mar. 7, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/70 (2014.01); H04N 19/172 (2014.01); H04N 19/186 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/70 (2014.11) [H04N 19/172 (2014.11); H04N 19/186 (2014.11); H04N 19/46 (2014.11)] 6 Claims
OG exemplary drawing
 
1. A method to reconstruct coded data with one or more processors, the method comprising:
receiving a coded bitstream comprising one or more coded pictures, wherein each picture comprises a luminance component, a first chroma component, and a second chroma component;
extracting syntax parameters from the coded bitstream to determine a chroma quantization parameter (QP) table from one or more chroma QP tables, wherein each of the one or more chroma QP tables maps input luminance QP values to corresponding chroma QP values; and
decoding the one or more coded pictures based on the determined chroma QP table, wherein the syntax parameters comprise a start luminance QP value and one or more offset parameters to determine a mapping of the luminance QP values to the chroma QP values using a piece-wise linear representation, and wherein the syntax parameters comprise a flag indicating whether using a single chroma QP table for Cb and Cr chroma or whether using separate tables for the Cb and Cr chroma.