ALEXANDRIA, Va., July 15 -- United States Patent no. 12,666,074, issued on June 23, was assigned to InterDigital VC Holdings Inc. (Wilmington, Del.).

"Systems, apparatus and methods for inter prediction refinement with optical flow" was invented by Jiancong Luo (Skillman, N.J.) and Yuwen He (San Diego).

According to the abstract* released by the U.S. Patent & Trademark Office: "Method, apparatus and systems are disclosed. In one embodiment, a method of decoding includes obtaining a sub-block based motion prediction signal for a current block of the video; obtaining one or more spatial gradients of the sub-block based motion prediction signal or one or more motion vector difference values; obtaining a refinement signal for the current bloc...