# US 2019/0174128 A1 · Intra-prediction mode-based image processing method and device therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174128 A1 - Document ID: US20190174128A1 - Status: Published application - Kind: A1 - Application number: 16/324,452 - Filed: 2017-02-07 - Published: 2019-06-06 - Earliest claimed: 2016-08-08 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyeongmoon JANG; Junghak NAM; Jaehyun LIM; Jin HEO - Web page: https://patentgrep.com/patent/US20190174128A1 ## CPC - H04N 19/11: among a plurality of spatial predictive coding modes - 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 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks - 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 19/159: 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: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Disclosed are an intra-prediction mode-based image processing method and a device therefor. Particularly, a method for processing an image on the basis of an intra-prediction mode may comprise the steps of: configuring a reference sample to be used for prediction of a current block on the basis of width information and height information of the current block when the current block is a non-square block; deriving an intra-prediction mode of the current block; and generating a prediction sample of the current block by using the reference sample on the basis of the intra-prediction mode of the current block. ## Claims ### Claim 1 A method of processing video based on an intra prediction mode, the method comprising: configuring a reference sample to be used for prediction of a current block based on width and height information of the current block when the current block is a non-square block; deriving an intra prediction mode of the current block; and generating a prediction sample of the current block using the reference sample based on the intra prediction mode of the current block. ### Claim 2 (depends on 1) The method of claim 1, wherein the step of deriving the intra prediction mode of the current block further comprises the step of adaptively determining a plurality of intra prediction modes applicable to the current block based on the width and height information of the current block, and wherein the intra prediction mode of the current block is derived among the plurality of determined intra prediction modes. ### Claim 3 (depends on 1) The method of claim 1, wherein when the width of the current block is N and the height of the current block is M, the reference sample is configured with one sample neighboring a top left of the current block, M samples neighboring a left of the current block, N samples neighboring a bottom left of the current block, N samples neighboring a top of the current block and M samples neighboring a top right of the current block. ### Claim 4 (depends on 2) The method of claim 2, wherein the plurality of intra prediction modes applicable to the current block is determined as intra prediction modes in which prediction directions are differentially distributed based on a ratio of the width and height of the current block. ### Claim 5 (depends on 2) The method of claim 2, wherein when the width is greater among the width and height of the current block, the plurality of intra prediction modes applicable to the current block is determined as intra prediction modes in which a number of prediction directions is more distributed between a prediction direction of an angle of 45° and a prediction direction of an angle of 135° than between a prediction direction of an angle of 135° and a prediction of an angle of 225°. ### Claim 6 (depends on 2) The method of claim 2, wherein when the height is greater among the width and height of the current block, the plurality of intra prediction modes applicable to the current block is determined as intra prediction modes in which a number of prediction directions is more distributed between a prediction direction of an angle of 135° and a prediction of an angle of 225° than between a prediction direction of an angle of 45° and a prediction direction of an angle of 135°. ### Claim 7 (depends on 2) The method of claim 2, wherein the plurality of intra prediction modes applicable to the current block is determined as intra prediction modes from which a specific number of prediction directions have been removed based on a ratio of the width and height of the current block. ### Claim 8 (depends on 2) The method of claim 2, wherein the plurality of intra prediction modes applicable to the current block is determined by sub-sampling a prediction direction of a specific angle range based on a ratio of the width and height of the current block. ### Claim 9 (depends on 2) The method of claim 2, wherein the plurality of intra prediction modes applicable to the current block is determined as intra prediction modes from which a plurality of prediction directions has been removed based on a ratio of the width and height of the current block and to which prediction directions have been added to a specific angle range comprising a vertical mode or horizontal mode as many as the number of removed prediction directions. ### Claim 10 (depends on 2) The method of claim 2, wherein the plurality of intra prediction modes applicable to the current block is determined as intra prediction modes from which a plurality of prediction directions has been removed based on a ratio of the width and height of the current block and to which prediction directions have been added between a plurality of prediction directions neighboring to a vertical mode or horizontal mode as many as the number of removed prediction directions. ### Claim 11 (depends on 1) The method of claim 1, further comprising: determining whether to split the current block into a plurality of square sub-blocks based on a ratio of the width and height of the current block, wherein if the current block is not split into a plurality of square sub-blocks, the prediction sample of the current block is generated in a current block unit, wherein if the current block is split into a plurality of square sub-blocks, the prediction sample of the current block is generated in a sub-block unit, and wherein the sub-block is identical with a transform unit transforming a residual signal of the current block. ### Claim 12 (depends on 1) The method of claim 1, further comprising: splitting the current block into a plurality of square sub-blocks when the width is greater among the width and height of the current block and an angle of the intra prediction mode of the current block is greater than 180°, wherein the prediction sample of the current block is generated in the sub-block unit using the reference sample based on the intra prediction mode of the current block, and wherein the sub-block is identical with a transform unit transforming a residual signal of the current block. ### Claim 13 (depends on 1) The method of claim 1, further comprising: splitting the current block into a plurality of square sub-blocks when the height is greater among the width and height of the current block and an angle of the intra prediction mode of the current block is smaller than 90°, wherein the prediction sample of the current block is generated in the sub-block unit using the reference sample based on the intra prediction mode of the current block, and wherein the sub-block is identical with a transform unit transforming the residual signal of the current block. ### Claim 14 (depends on 1) The method of claim 1, further comprising: splitting the current block into a plurality of square sub-blocks, wherein the prediction sample of the current block is generated in the sub-block unit using the reference sample based on the intra prediction mode of the current block, and wherein the sub-block is identical with a transform unit transforming the residual signal of the current block. ### Claim 15 An apparatus processing video based on an intra prediction mode, comprising: a reference sample configuration unit configured to configure a reference sample to be used for prediction of a current block based on width and height information of the current block when the current block is a non-square block; a prediction mode derivation unit configured to derive an intra prediction mode of the current block; and a prediction sample generation unit configured to generate a prediction sample of the current block using the reference sample based on the intra prediction mode of the current block.