ALEXANDRIA, Va., March 12 -- United States Patent no. 12,250,408, issued on March 11, was assigned to Tencent America LLC (Palo Alto, Calif.).

"Deriving affine merge candidates when neighboring blocks are outside of current coding unit" was invented by Guichun Li (Milpitas, Calif.), Xiaozhong Xu (State College, Pa.), Xiang Li (Los Gatos, Calif.) and Shan Liu (San Jose, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for video encoding includes determining that a current block in a first coding tree unit (CTU) of a current picture is to be coded using an affine model in a merge mode, and obtaining, from a line buffer, one or more motion vectors of blocks located at bottom locations in a second ...