US Patent Issued to Apple on Feb. 3 for "Chroma quantization in video coding" (California Inventors)

ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,542,903, issued on Feb. 3, was assigned to Apple Inc. (Cupertino, Calif.).

"Chroma quantization in video coding" was invented by Alexandros Tourapis (Los Gatos, Calif.) and Guy Cote (Aptos, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its ow...