# US 2019/0379908 A1 · Image encoding/decoding method using prediction block and apparatus for same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0379908 A1 - Document ID: US20190379908A1 - Status: Published application - Kind: A1 - Application number: 16/546,930 - Filed: 2019-08-21 - Published: 2019-12-12 - Earliest claimed: 2011-06-20 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Jin Ho LEE; Hui Yong KIM; Sung Chang LIM; Jin Soo CHOI; Jin Woong KIM - Web page: https://patentgrep.com/patent/US20190379908A1 ## 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 19/122: Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type - H04N 19/136: Incoming video signal characteristics or properties - H04N 19/137: Motion inside a coding unit, e.g. average field, frame or block difference - H04N 19/157: Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter - H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction - H04N 19/182: the unit being a pixel - H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder - 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 19/176: the region being a block, e.g. a macroblock - H04N 19/96: Tree coding, e.g. quad-tree coding - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract According to the present invention, an image encoding/decoding method comprises the steps of: performing an intra prediction on a current block so as to generate a prediction block; performing filtering on a filtering target pixel in the prediction block on the basis of the intra prediction mode of the current block so as to generate a final prediction block; and generating a reconstructed block on the basis of a reconstructed differential block corresponding to the current block and on the final prediction block. According to the present invention, image encoding/decoding efficiency can be improved. ## Claims ### Claim 1 A video decoding apparatus comprising: a prediction block generating unit to generate a prediction block by performing prediction on a current block based on an intra prediction mode of the current block; and a reconstructed block generating unit to generate a reconstructed block based on the prediction block and a reconstructed residual block corresponding to the current block, wherein the prediction block comprises prediction pixels, the prediction pixels are pixels on an upper horizontal pixel line, the prediction pixels are filtered based on an offset when the intra prediction mode of the current block is a horizontal mode, and the upper horizontal pixel line is one horizontal pixel line positioned at an uppermost side of the current block. ### Claim 2 (depends on 1) The video decoding apparatus of claim 1, wherein the prediction pixels are filtered by adding a value of the offset to a pixel value of a first reference pixel present on the same horizontal line as a horizontal line on which the prediction pixels are present among reconstructed reference pixels adjacent to a left of the current block when the intra prediction mode of the current block is the horizontal mode, and the value of the offset is determined based on a difference value between a pixel value of a second reference pixel adjacent to an upper portion of the prediction pixels and a pixel value of a third reference pixel adjacent to an upper portion of the first reference pixel. ### Claim 3 (depends on 1) The video decoding apparatus of claim 1, wherein the prediction block generating unit performs filtering when a size of the current block is smaller than 32×32. ### Claim 4 A video encoding apparatus comprising: a prediction block generating unit to generate a prediction block by performing prediction on a current block based on an intra prediction mode of the current block; and a reconstructed block generating unit to generate a reconstructed block based on the prediction block and a reconstructed residual block corresponding to the current block, wherein the prediction block comprises prediction pixels, the prediction pixels are pixels on an upper horizontal pixel line, the prediction pixels are filtered based on an offset when the intra prediction mode of the current block is a horizontal mode, and the upper horizontal pixel line is one horizontal pixel line positioned at an uppermost side of the current block. ### Claim 5 (depends on 4) The video encoding apparatus of claim 4, wherein the prediction pixels are filtered by adding a value of the offset to a pixel value of a first reference pixel present on the same horizontal line as a horizontal line on which the prediction pixels are present among reconstructed reference pixels adjacent to a left of the current block when the intra prediction mode of the current block is the horizontal mode, and the value of the offset is determined based on a difference value between a pixel value of a second reference pixel adjacent to an upper portion of the prediction pixels and a pixel value of a third reference pixel adjacent to an upper portion of the first reference pixel. ### Claim 6 (depends on 4) The video encoding apparatus of claim 4, wherein the prediction block generating unit performs filtering when a size of the current block is smaller than 32×32. ### Claim 7 A non-transitory computer-readable medium storing a bitstream, the bitstream comprising: prediction mode information indicating an intra prediction mode for a current block on which filtering is performed; wherein a prediction block is generated by performing prediction on the current block based on the intra prediction mode of the current block which the prediction mode information indicates, a reconstructed block is generated based on the prediction block and a reconstructed residual block corresponding to the current block, the prediction block comprises prediction pixels, the prediction pixels are pixels on an upper horizontal pixel line, the filtering is performed on the prediction pixels based on an offset when the intra prediction mode of the current block is a horizontal mode, and the upper horizontal pixel line is one horizontal pixel line positioned at an uppermost side of the current block. ### Claim 8 (depends on 7) The non-transitory computer-readable medium of claim 7, wherein the prediction pixels are filtered by adding a value of the offset to a pixel value of a first reference pixel present on the same horizontal line as a horizontal line on which the prediction pixels are present among reconstructed reference pixels adjacent to a left of the current block when the intra prediction mode of the current block is the horizontal mode, and the value of the offset is determined based on a difference value between a pixel value of a second reference pixel adjacent to an upper portion of the prediction pixels and a pixel value of a third reference pixel adjacent to an upper portion of the first reference pixel. ### Claim 9 (depends on 7) The non-transitory computer-readable medium of claim 7, wherein the filtering is performed when a size of the current block is smaller than 32×32.