Patent ID: 11949894
Assignee: TENCENT AMERICA LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A non-transitory computer-readable medium storing instructions which when executed by a computer for video decoding cause the computer to perform:
determining a string vector for a current string in a first sub-block of a current coding tree unit (CTU), the string vector pointing to a reference string for the current string, the reference string being positioned across a boundary such that a first portion of the reference string is in a second sub-block and a second portion of the reference string is in a third sub-block of the CTU;
determining whether a vertical cross boundary constraint or a horizontal cross boundary constraint are applied to the reference string is;
in response to a determination that (i) the vertical cross boundary constraint is applied and (ii) the boundary of the second sub-block and the third sub-block is a vertical boundary, determining that the reference string is not allowed; and
in response to a determination that (i) the horizontal cross boundary constraint is applied and (ii) the boundary of the second sub-block and the third sub-block is a horizontal boundary, determining that the reference string is not allowed.