# US 2026/0101032 A1 · Cross-component sample offset edge direction derivations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0101032 A1 - Document ID: US20260101032A1 - Status: Published application - Kind: A1 - Application number: 19/352,316 - Filed: 2025-10-07 - Published: 2026-04-09 - Earliest claimed: 2024-10-07 - Assignees: Tencent America LLC - Applicants: Tencent America LLC - Inventors: Tianqi LIU; Liang ZHAO; Madhu PERINGASSERY KRISHNAN; Ting-Lan LIN; Shan LIU - Web page: https://patentgrep.com/patent/US20260101032A1 ## CPC - H04N 19/117: Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635) - G06T 7/13: Edge detection - H04N 19/14: Coding unit complexity, e.g. amount of activity or edge presence estimation (H04N19/146 takes precedence) - H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction - H04N 19/176: the region being a block, e.g. a macroblock - H04N 19/80: Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation (H04N19/635, H04N19/86 take precedence) - H04N 19/82: involving filtering within a prediction loop - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract An example method of video coding includes receiving a video bitstream comprising a plurality of frames, including a current frame comprising a current block. The method also includes determining an edge direction by performing edge detection for the current block, and determining a difference between a current sample of the current block and a neighboring sample based on the edge direction. The method further includes applying a filter to the current block based on the determined difference. ## Claims ### Claim 1 A method of video decoding performed at a computing system having memory and one or more processors, the method comprising: receiving a video bitstream comprising a plurality of frames, including a current frame comprising a current block; determining an edge direction by performing edge detection for the current block; determining a difference between a current sample of the current block and a neighboring sample based on the edge direction; and applying a filter to the current block based on the determined difference. ### Claim 2 (depends on 1) The method of claim 1, wherein the edge detection is performed using a constrained directional enhancement filter (CDEF) edge detection technique. ### Claim 3 (depends on 2) The method of claim 2, wherein determining the edge direction comprises mapping a CDEF edge direction to a filter index. ### Claim 4 (depends on 1) The method of claim 1, wherein the edge detection is preformed using one or more of: a Canny edge detector, a Sobel operator, and a Laplacian of Gaussian (LoG) operator. ### Claim 5 (depends on 1) The method of claim 1, wherein the edge detection is preformed using an intra prediction direction of the current block. ### Claim 6 (depends on 5) The method of claim 5, wherein the intra prediction direction is mapped to a filter index. ### Claim 7 (depends on 1) The method of claim 1, further comprising, for each frame in the plurality of frames, determining a respective unit size for the filter. ### Claim 8 (depends on 7) The method of claim 7, wherein the respective unit size for the current frame is determined based on a superblock size for the current frame. ### Claim 9 (depends on 1) The method of claim 1, wherein the filter comprises a cross-component sample offset (CCSO) filter. ### Claim 10 (depends on 1) The method of claim 1, wherein the filter comprises a CDEF filter. ### Claim 11 (depends on 1) The method of claim 1, further comprising determining a filter shape for the filter by parsing an indicator from the video bitstream. ### Claim 12 A method of video encoding performed at a computing system having memory and one or more processors, the method comprising: receiving video data comprising a plurality of frames, including a current frame comprising a current block; determining an edge direction by performing edge detection for the current block; determining a difference between a current sample of the current block and a neighboring sample based on the edge direction; and applying a filter to the current block based on the determined difference. ### Claim 13 (depends on 12) The method of claim 12, wherein the filter comprises at least one of: a CDEF filter, and a CCSO filter. ### Claim 14 (depends on 12) The method of claim 12, wherein the edge detection is preformed using a CDEF edge detection technique. ### Claim 15 (depends on 14) The method of claim 14, wherein determining the edge direction comprises mapping a CDEF edge direction to a filter index. ### Claim 16 (depends on 12) The method of claim 12, wherein the edge detection is preformed using one or more of: a Canny edge detector, a Sobel operator, and an LoG operator. ### Claim 17 (depends on 12) The method of claim 12, wherein the edge detection is preformed using an intra prediction direction of the current block. ### Claim 18 A non-transitory computer-readable storage medium storing a video bitstream that is generated by a video encoding method, the video bitstream comprising: coded information for a plurality of blocks of video data, including a current block; and wherein the video encoding method comprises: determining an edge direction by performing edge detection for the current block; determining a difference between a current sample of the current block and a neighboring sample based on the edge direction; and applying a filter to the current block based on the determined difference. ### Claim 19 (depends on 18) The non-transitory computer-readable storage medium of claim 18, wherein the filter comprises at least one of: a CDEF filter, and a CCSO filter. ### Claim 20 (depends on 18) The non-transitory computer-readable storage medium of claim 18, wherein the edge detection is preformed using a CDEF edge detection technique.