# US 2017/0289548 A1 · Method and device for encoding/decoding images > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0289548 A1 - Document ID: US20170289548A1 - Status: Published application - Kind: A1 - Application number: 15/630,831 - Filed: 2017-06-22 - Published: 2017-10-05 - Earliest claimed: 2012-06-29 - Assignees: Electronics and Telecommunications Research Institute; University-Industry Cooperation Group of Kyung Hee University - Applicants: Electronics and Telecommunications Research Institute; University-Industry Cooperation Group of Kyung Hee University - Inventors: Hui Yong KIM; Sung Chang LIM; Jin Ho LEE; Jin Soo CHOI; Jin Woong KIM; Gwang Hoon PARK; Kyung Yong KIM - Web page: https://patentgrep.com/patent/US20170289548A1 ## CPC - H04N 19/12: Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264 - H04N 19/129: Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO] - H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks - H04N 19/122: Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type - H04N 19/124: Quantisation - H04N 19/136: Incoming video signal characteristics or properties - 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 19/176: the region being a block, e.g. a macroblock - H04N 19/186: the unit being a colour or a chrominance component - H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder - H04N 19/593: involving spatial prediction techniques - H04N 19/61: in combination with predictive coding - H04N 19/625: using discrete cosine transform [DCT] - 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 and a device for encoding/decoding images are disclosed. The method for encoding images comprises the steps of: deriving a scan type of a residual signal for a current block according to whether or not the current block is a transform skip block; and applying the scan type to the residual signal for the current block, wherein the transform skip block is a block to which transform for the current block is not applied and is specified on the basis of information indicating whether or not transform for the current block is to be applied. ## Claims ### Claim 1 A video decoding method comprising: obtaining a residual signal of a current block based on a scanning direction (scanIdx) of the current block; determining a transform type of the current block; obtaining a residual sample of the current block by performing the inverse-transform on the residual signal of the current block based on the determined transform type; and reconstructing the current block based on the residual sample of the current block. ### Claim 2 (depends on 1) The video decoding method of claim 1, further comprising: obtaining first information indicating whether the residual signal is present in the current block, the current block including one or more transform coefficient levels other than 0 when the first information indicates that the residual signal is present in the current block. ### Claim 3 (depends on 2) The video decoding method of claim 2, wherein when the first information indicates that the residual signal is present in the current block, the obtaining the residual signal of the current block is performed. ### Claim 4 (depends on 1) The video decoding method of claim 1, wherein the scanning direction of the current block being determined based on an intra prediction mode of the current block. ### Claim 5 (depends on 1) The video decoding method of claim 1, further comprising: obtaining second information indicating whether an inverse-transform is performed on the residual signal of the current block. ### Claim 6 (depends on 5) The video decoding method of claim 5, wherein when the second information indicates that the inverse-transform is performed on the current block, the obtaining residual sample of the current block is performed. ### Claim 7 (depends on 1) The video decoding method of claim 1, wherein the transform type of the current block is determined independently to an intra prediction mode of the current block. ### Claim 8 (depends on 2) The video decoding method of claim 2, further comprising: obtaining information indicating a difference value between a quantization parameter for the current block and a predicted value of the quantization parameter when the first information indicates that the residual signal is present in the current block. ### Claim 9 (depends on 1) The video decoding method of claim 1, wherein the scanning direction of the current block is derived using a scanning direction of a neighboring block adjacent to the current block. ### Claim 10 (depends on 1) The video decoding method of claim 1, wherein the transform type of the current block is determined based on at least one of the size of the current block or an intra prediction mode of the current block.