# US 10,455,236 B2 · Intra-frame prediction and decoding methods and apparatuses for image signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,236 B2 - Document ID: US10455236B2 - Status: Granted - Kind: B2 - Application number: 16/394,763 - Filed: 2019-04-25 - Published: 2019-08-29 - Granted: 2019-10-22 - Earliest claimed: 2011-11-04 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xingyu Zhang; Oscar Au; Haitao Yang; Jiantong Zhou - Web page: https://patentgrep.com/patent/US10455236B2 ## CPC - H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction - 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 19/14: Coding unit complexity, e.g. amount of activity or edge presence estimation (H04N19/146 takes precedence) - 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 19/59: involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution - H04N 19/593: involving spatial prediction techniques - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An intra-frame decoding method is provided. The method includes: obtaining, from a video code stream, prediction mode information of a first signal component of a current block, determining a prediction mode of the first signal component of the current block from a prediction mode set of the first signal component of the current block according to the prediction mode information of the first signal component of the current block, where the prediction mode set of the first signal component of the current block includes at least one of a linear model above (LMA) mode and a linear model left (LML) mode, obtaining a predicted value of a first signal component sampling point of the current block, and obtaining a reconstructed value of the first signal component sampling point of the current block according to the predicted value of the first signal component sampling point of the current block. ## Claims ### Claim 1 A prediction method for a signal component sampling point of an image block, comprising: obtaining a correlation parameter based on a reconstructed value of a first signal component sampling point in a reference block of a current block and a reconstructed value of a second signal component sampling point in the reference block; and calculating a predicted value of a first signal component sampling point of the current block based on a reconstructed value of a second signal component sampling point of the current block and the correlation parameter, wherein the reference block comprises a combination of a first block and a second block, the first block being above the current block, and the second block being on the right side of the first block. ### Claim 2 (depends on 1) The prediction method of claim 1, wherein the first signal component sampling point is a chrominance component sampling point, and the second signal component sampling point is a luminance component sampling point. ### Claim 3 (depends on 1) The prediction method of claim 1, wherein the correlation parameter is based on a plurality of reconstructed values of a plurality of luminance component sampling points and a plurality of chrominance component sampling points. ### Claim 4 (depends on 1) The prediction method of claim 1, wherein the predicted value of the first signal component sampling point of the current block is calculated using a prediction mode set comprising at least one of a direct mode (DM) mode, a linear method (LM) mode, a top linear method mode, a left linear method mode, a planar mode, a vertical mode, a horizontal mode, or a direct current (DC) mode. ### Claim 5 (depends on 1) The prediction method of claim 1, further comprising obtaining prediction information of the first signal component sampling point of the current block from a video code stream, the prediction information indicating a prediction mode of the first signal component sampling point of the current block, the prediction mode being at least one of a direct mode (DM) mode, a linear method (LM) mode, the top linear method mode, the left linear method mode, a planar mode, a vertical mode, a horizontal mode, or a direct current (DC) mode. ### Claim 6 A prediction method for a signal component sampling point of an image block, comprising: obtaining a correlation parameter based on a reconstructed value of a first signal component sampling point in a reference block of a current block and a reconstructed value of a second signal component sampling point in the reference block; and calculating a predicted value of a first signal component sampling point of the current block based on a reconstructed value of a second signal component sampling point of the current block and the correlation parameter, wherein the reference block comprises a combination of a first block and a second block, the first block being on the left side of the current block, and the second block being below the first block. ### Claim 7 (depends on 6) The prediction method of claim 6, wherein the first signal component sampling point is a chrominance component sampling point, and the second signal component sampling point is a luminance component sampling point. ### Claim 8 (depends on 6) The prediction method of claim 6, wherein the correlation parameter is based on a plurality of reconstructed values of a plurality of luminance component sampling points and a plurality of chrominance component sampling points. ### Claim 9 (depends on 6) The prediction method of claim 6, further comprising obtaining prediction information of the first signal component sampling point of the current block from a video code stream, the prediction information indicating a prediction mode of the first signal component sampling point of the current block, the prediction mode being at least one of a direct mode (DM) mode, a linear method (LM) mode, a top linear method mode, a left linear method mode, a planar mode, a vertical mode, a horizontal mode, or a direct current (DC) mode. ### Claim 10 (depends on 6) The prediction method of claim 6, wherein the predicted value of the first signal component sampling point of the current block is calculated using a prediction mode set comprising at least one of a direct mode (DM) mode, a linear method (LM) mode, a top linear method mode, a left linear method mode, a planar mode, a vertical mode, a horizontal mode, or a direct current (DC) mode. ### Claim 11 An apparatus for predicting a signal component sampling point of an image block comprising: a memory configured to store instructions; and a processor coupled to the memory and configured to execute the instructions, which cause the processor to be configured to: obtain a correlation parameter based on a reconstructed value of a first signal component sampling point in a reference block of a current block and a reconstructed value of a second signal component sampling point in the reference block; and calculate a predicted value of a first signal component sampling point of the current block based on a reconstructed value of a second signal component sampling point of the current block and the correlation parameter, wherein the reference block comprises at least one of a combination of a first block and a second block or a combination of a third block and a fourth block, the first block being above the current block, the second block being on the right side of the first block, the third block being on the left side of the current block, and the fourth block being below the third block. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the first signal component sampling point is a chrominance component sampling point, and the second signal component sampling point is a luminance component sampling point. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the correlation parameter is based on a plurality of reconstructed values of a plurality of luminance component sampling points and a plurality of chrominance component sampling points. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the predicted value of the first signal component sampling point of the current block is calculated using a prediction mode set comprising at least one of a direct mode (DM) mode, a linear method (LM) mode, a top linear method mode, a left linear method mode, a planar mode, a vertical mode, a horizontal mode, or a direct current (DC) mode. ### Claim 15 (depends on 11) The apparatus of claim 11, wherein the instructions cause the processor to be further configured to obtain prediction information of the first signal component sampling point of the current block from a video code stream, the prediction information indicating a prediction mode of the first signal component sampling point of the current block, the prediction mode being at least one of a direct mode (DM) mode, a linear method (LM) mode, a top linear method mode, a left linear method mode, a planar mode, a vertical mode, a horizontal mode, or a direct current (DC) mode. ### Claim 16 (depends on 11) The apparatus of claim 11, wherein the predicted value of the first signal component sampling point of the current block is calculated using a top linear method mode, and wherein the reference block is the combination of the first block and the second block. ### Claim 17 (depends on 11) The apparatus of claim 11, wherein the predicted value of the first signal component sampling point of the current block is calculated using a left linear method, and wherein the reference block is the combination of the third block and the fourth block.