ALEXANDRIA, Va., July 21 -- United States Patent no. 12,689,750, issued on July 21, was assigned to Tencent America LLC (Palo Alto, Calif.).
"Secondary transform" was invented by Xin Zhao (San Jose, Calif.), Xiang Li (Saratoga, Calif.) and Shan Liu (San Jose, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "In a method for video decoding in a decoder, coded information of a coding unit (CU) is decoded from a coded video bitstream. The coded information indicating a last position of non-zero transform coefficients of a first coding block (CB) of the CU. Whether a secondary transform index is signaled in the coded information is determined based on whether the last position of non-zero transform coefficie...