# US 12,010,318 B2 · Systems and methods for reference offset signaling in video coding > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,318 B2 - Document ID: US12010318B2 - Status: Granted - Kind: B2 - Application number: 17/991,037 - Filed: 2022-11-21 - Published: 2023-06-08 - Granted: 2024-06-11 - Earliest claimed: 2018-11-02 - Assignees: Sharp Kabushiki Kaisha; FG Innovation Company Limited - Applicants: Sharp Kabushiki Kaisha; FG Innovation Company Limited - Inventors: Sachin G. Deshpande - Web page: https://patentgrep.com/patent/US12010318B2 ## CPC - H04N 19/132: Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking - H04N 19/105: Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction - H04N 19/176: the region being a block, e.g. a macroblock - H04N 19/186: the unit being a colour or a chrominance component - H04N 19/55: Motion estimation with spatial constraints, e.g. at image or region borders - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A method of deriving prediction sample values for decoding video data by a device is provided. A reference wraparound offset syntax specifying an offset used for computing a horizontal wrap-around position is decoded. A luma location is derived based on a product of a value of the reference wraparound offset syntax and a minimum coding block size. An offset variable is set equal to a value obtained by dividing the product of the value of the reference wraparound offset syntax and the minimum coding block size by a width value, and the width value is specified based on a chroma format. A chroma location is derived by using the offset variable. A predicted luma sample value is derived by using the luma location. ## Claims ### Claim 1 A method of deriving prediction sample values for decoding video data, the method comprising: decoding a reference wraparound offset syntax specifying an offset used for computing a horizontal wrap-around position; deriving a luma location based on a product of a value of the reference wraparound offset syntax and a minimum coding block size; setting an offset variable equal to a value obtained by dividing the product of the value of the reference wraparound offset syntax and the minimum coding block size by a width value, wherein the width value is specified based on a chroma format; deriving a chroma location by using the offset variable; and deriving a predicted luma sample value by using the luma location. ### Claim 2 (depends on 1) The method of claim 1, wherein a maximum value of the reference wraparound offset syntax is determined by subtracting a positive number from a quotient obtained by dividing a width of each decoded picture by the minimum coding block size. ### Claim 3 (depends on 1) The method of claim 1, wherein the luma location is derived for a luma sample bilinear interpolation process. ### Claim 4 (depends on 1) The method of claim 1, wherein the chroma format includes one of a 4:2:0 format, a 4:2:2 format, and a 4:4:4 format. ### Claim 5 A method of deriving prediction sample values for encoding data, the method comprising: encoding a reference wraparound offset syntax specifying an offset used for computing a horizontal wrap-around position; deriving a luma location based on a product of a value of the reference wraparound offset syntax and a minimum coding block size; setting an offset variable equal to a value obtained by dividing the product of the value of the reference wraparound offset syntax and the minimum coding block size by a width value, wherein the width value is specified based on a chroma format; deriving a chroma location by using the offset variable; and deriving a predicted luma sample value by using the luma location. ### Claim 6 (depends on 5) The method of claim 5, wherein a maximum value of the reference wraparound offset syntax is determined by subtracting a positive number from a quotient obtained by dividing a width of each decoded picture by the minimum coding block size. ### Claim 7 (depends on 5) The method of claim 5, wherein the luma location is derived for a luma sample bilinear interpolation process. ### Claim 8 (depends on 5) The method of claim 5, wherein the chroma format includes one of a 4:2:0 format, a 4:2:2 format, and a 4:4:4 format. ### Claim 9 A device for deriving prediction sample values for decoding video data, the device comprising: one or more processors; and at least one storage device coupled to the one or more processors and storing computer-executable instructions which, when executed by the one or more processors, cause the device to: decode a reference wraparound offset syntax specifying an offset used for computing a horizontal wrap-around position; derive a luma location based on a product of a value of the reference wraparound offset syntax and a minimum coding block size; set an offset variable equal to a value obtained by dividing the product of the value of the reference wraparound offset syntax and the minimum coding block size by a width value, wherein the width value is specified based on a chroma format; derive a chroma location by using the offset variable; and derive a predicted luma sample value by using the luma location. ### Claim 10 (depends on 9) The device of claim 9, wherein a maximum value of the reference wraparound offset syntax is determined by subtracting a positive number from a quotient obtained by dividing a width of each decoded picture by the minimum coding block size. ### Claim 11 (depends on 9) The device of claim 9, wherein the luma location is derived for a luma sample bilinear interpolation process. ### Claim 12 (depends on 9) The device of claim 9, wherein the chroma format includes one of a 4:2:0 format, a 4:2:2 format, and a 4:4:4 format.