# US 11,910,010 B2 · Intra-prediction method, and encoder and decoder using same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,010 B2 - Document ID: US11910010B2 - Status: Granted - Kind: B2 - Application number: 17/132,378 - Filed: 2020-12-23 - Published: 2021-04-15 - Granted: 2024-02-20 - Earliest claimed: 2011-04-25 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Joonyoung Park; Seungwook Park; Jaehyun Lim; Jungsun Kim; Younghee Choi; Byeongmoon Jeon; Yongjoon Jeon - Web page: https://patentgrep.com/patent/US11910010B2 ## CPC - H04N 19/593: involving spatial prediction techniques - 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 19/11: among a plurality of spatial predictive coding modes - H04N 19/117: Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635) - H04N 19/176: the region being a block, e.g. a macroblock - H04N 19/182: the unit being a pixel - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N 19/82: involving filtering within a prediction loop - H04N 19/61: in combination with predictive coding - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract The present invention relates to an intra-prediction method and to an encoder and decoder using same. The intra-prediction method according to one embodiment of the present invention comprises the steps of: deriving a prediction mode of a current block; and generating a prediction block with respect to the current block on the basis of the prediction mode of the current block. When the prediction mode of the current block is an intra-angular prediction mode, values of boundary samples from among left boundary samples and upper boundary samples of the prediction block, which are not positioned in a prediction direction of the intra-angular prediction mode, are derived on the basis of reference samples positioned in the prediction direction of the intra-angular prediction mode, and on the basis of adjacent reference samples. ## Claims ### Claim 1 A method for decoding an image, performed by a decoding apparatus, the method comprising: deriving an intra prediction mode for a current block based on prediction mode information obtained from a bitstream; generating prediction samples of the current block based on the intra prediction mode; and generating a reconstructed picture based on the prediction samples, wherein the intra prediction mode is a horizontal prediction mode having a horizontal prediction direction, wherein the step of generating the prediction samples includes: deriving a prediction sample based on a first reference sample located along the horizontal prediction direction with regard to a location of the prediction sample, and performing filtering on the prediction sample based on a second reference sample located along a vertical direction with regard to a location of the prediction sample, wherein the prediction sample is adjacent to a top boundary of the current block among the prediction samples, wherein the first reference sample is located outside of the current block and is adjacent to a left boundary of the current block, wherein the second reference sample is located outside of the current block and is adjacent to an upper side of the prediction sample, wherein a filtering coefficient applied to a value of the prediction sample is larger than a filtering coefficient applied to a value of the second reference sample. ### Claim 2 (depends on 1) The method of claim 1, wherein the first reference samples has a same y coordinate as the prediction sample to be filtered. ### Claim 3 (depends on 1) The method of claim 1, wherein a prediction sample which is not adjacent to a top boundary of the current block among the prediction samples is not filtered. ### Claim 4 (depends on 1) The method of claim 1, wherein the second reference sample has a same x coordinate as the prediction sample to be filtered. ### Claim 5 (depends on 1) The method of claim 1, wherein the prediction sample is adjacent to a lower side of the upper boundary of the current block, and wherein the second reference sample is adjacent to an upper side of the upper boundary of the current block. ### Claim 6 A method for encoding an image, performed by an encoding apparatus, the method comprising: determining an intra prediction mode for a current block; generating prediction mode information based on the intra prediction mode; generating prediction samples of the current block based on the intra prediction mode; and encoding image information including the prediction mode information, wherein the intra prediction mode is a horizontal prediction mode having a horizontal prediction direction, wherein the step of generating the prediction samples includes: deriving a prediction sample based on a first reference sample located along the horizontal prediction direction with regard to a location of the prediction sample, and performing filtering on the prediction sample based on a second reference sample located along a vertical direction with regard to a location of the prediction sample, wherein the prediction sample is adjacent to a top boundary of the current block among the prediction samples, wherein the first reference sample is located outside of the current block and is adjacent to a left boundary of the current block, wherein the second reference sample is located outside of the current block and is adjacent to an upper side of the prediction sample, wherein a filtering coefficient applied to a value of the prediction sample is larger than a filtering coefficient applied to a value of the second reference sample. ### Claim 7 (depends on 6) The method of claim 6, wherein the first reference samples has a same y coordinate as the prediction sample to be filtered. ### Claim 8 (depends on 6) The method of claim 6, wherein a prediction sample which is not adjacent to a top boundary of the current block among the prediction samples is not filtered. ### Claim 9 (depends on 6) The method of claim 6, wherein the second reference sample has a same x coordinate as the prediction sample to be filtered. ### Claim 10 (depends on 6) The method of claim 6, wherein the prediction sample is adjacent to a lower side of the upper boundary of the current block, and wherein the second reference sample is adjacent to an upper side of the upper boundary of the current block. ### Claim 11 A non-transitory decoder-readable storage medium storing encoded image information generated by a method for encoding an image, the method comprising: determining an intra prediction mode for a current block; generating prediction mode information based on the intra prediction mode; generating prediction samples of the current block based on the intra prediction mode; and encoding image information including the prediction mode information, wherein the intra prediction mode is a horizontal prediction mode having a horizontal prediction direction, wherein the step of generating the prediction samples includes: deriving a prediction sample based on a first reference sample located along the horizontal prediction direction with regard to a location of the prediction sample, and performing filtering on the prediction sample based on a second reference sample located along a vertical direction with regard to a location of the prediction sample, wherein the prediction sample is adjacent to a top boundary of the current block among the prediction samples, wherein the first reference sample is located outside of the current block and is adjacent to a left boundary of the current block, wherein the second reference sample is located outside of the current block and is adjacent to an upper side of the prediction sample, wherein a filtering coefficient applied to a value of the prediction sample is larger than a filtering coefficient applied to a value of the second reference sample.