# US 10,873,750 B2 · Method for encoding video, method for decoding video, and apparatus using same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,750 B2 - Document ID: US10873750B2 - Status: Granted - Kind: B2 - Application number: 16/576,631 - Filed: 2019-09-19 - Published: 2020-01-09 - Granted: 2020-12-22 - Earliest claimed: 2012-12-14 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hendry Hendry; Joonyoung Park; Chulkeun Kim; Byeongmoon Jeon; Jungsun Kim - Web page: https://patentgrep.com/patent/US10873750B2 ## 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 19/172: the region being a picture, frame or field - H04N 19/176: the region being a block, e.g. a macroblock - H04N 19/187: the unit being a scalable video layer - H04N 19/30: using hierarchical techniques, e.g. scalability (H04N19/63 takes precedence) - H04N 19/33: in the spatial domain - H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) - H04N 19/463: by compressing encoding parameters before transmission - H04N 19/503: involving temporal prediction (adaptive coding with adaptive selection between spatial and temporal predictive coding H04N19/107; adaptive coding with adaptive selection among a plurality of temporal predictive coding modes H04N19/109) - H04N 19/573: Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction - H04N 19/577: Motion compensation with bidirectional frame interpolation, i.e. using B-pictures - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract The present invention relates to a method for coding a scalable video in a multilayer structure, and a method for encoding a video according to the present invention comprises the steps of: decoding and saving a picture of a reference layer; inducing an interlayer reference picture which is referenced for predicting a current block of a current layer; producing a reference picture list including the interlayer reference picture and a reference picture of the current layer; conducting a prediction on the current block of the current layer with the reference picture list to induce a prediction sample with respect to the current block; inducing a recovery sample with respect to the current block based on the prediction sample and the prediction block with respect to the current block; and transmitting reference information for indicating a picture that can be used for interlayer prediction from the pictures of the reference layer. ## Claims ### Claim 1 A video decoding method by a video decoder, comprising: receiving flag information for whether a picture in a reference layer is not used for an inter-layer prediction; deriving an inter-layer reference picture for a current block from at least one of pictures in the reference layer based on the flag information; constructing a reference picture list comprising the inter-layer reference picture in the reference layer and a reference picture in the current layer; deriving a predicted sample of the current block in the current layer based on the inter-layer reference picture comprised in the reference picture list; and deriving a reconstructed picture based on the predicted sample and a residual sample of the current block, wherein when the flag information indicates that a specific picture in the reference layer is not used for the inter-layer prediction, the specific picture is not comprised in the inter-layer reference picture set, and wherein the flag information is received through a slice segment header, and in all slice segment header of the picture in the reference layer, a value of the flag information is set to the same. ### Claim 2 (depends on 1) The method of claim 1, wherein when the flag information indicates that the specific picture in the reference layer is not used for the inter-layer prediction, decoding of the specific picture is ignored or skipped without affecting decoding of other pictures in the current layer. ### Claim 3 (depends on 1) The method of claim 1, wherein the value of the flag information is equal to one of 0 and 1. ### Claim 4 (depends on 1) The method of claim 1, wherein when the flag information indicates that the specific picture in the reference layer is not used for the inter-layer prediction, the specific picture in the reference layer is marked as unused for reference. ### Claim 5 (depends on 1) The method of claim 1, wherein the inter-layer reference picture is derived based on pictures indicated by the flag information to be used for inter-layer prediction among the pictures in the reference layer. ### Claim 6 (depends on 5) The method of claim 5, wherein the specific picture in the reference layer indicated by the flag information not used for the inter-layer prediction is marked as unused for reference, and the inter-layer reference picture is derived from pictures which are not marked as unused for reference. ### Claim 7 A video encoding method by a video encoder, comprising: deriving an inter-layer reference picture for a current block from at least one of pictures in a reference layer; constructing a reference picture list comprising the inter-layer reference picture in the reference layer and a reference picture in the current layer; deriving a predicted sample of a current block in a current layer based on the reference picture list; deriving a residual sample of the current block based on the predicted sample and an original sample of the current block; generating residual information for the residual sample of the current block; generating flag information for whether a picture in the reference layer is not used for the inter-layer prediction; and generating a bitstream including the residual information and the flag information, wherein when the flag information indicate that a specific picture in the reference layer is not used for the inter-layer prediction, the specific picture is not comprised in the reference picture set, and wherein the flag information is transmitted through a slice segment header, and in all slice segment header of the picture in the reference layer, a value of the flag information is set to the same. ### Claim 8 (depends on 7) The method of claim 7, wherein when the flag information indicates that the specific picture in the reference layer is not used for the inter-layer prediction, decoding of the specific picture can be ignored or skipped without affecting decoding of other pictures in the current layer. ### Claim 9 (depends on 7) The method of claim 7, wherein the value of the flag information is equal to one of 0 and 1. ### Claim 10 (depends on 7) The method of claim 7, wherein when the specific picture in the reference layer is not referred to in prediction of the current block and is not referred to in prediction of another picture in the reference layer which is referred to in prediction of the current block, the specific picture in the reference layer is marked as unused for reference, and the flag information comprises information specifying the specific picture which is not referred to in prediction of the current block and is not referred to in prediction of another picture in the reference layer that is referred to in prediction of the current block. ### Claim 11 A non-transitory computer-readable storage medium storing a bitstream comprising: residual information for a residual sample derived based on a predicted sample and an original sample of a current block; flag information for whether a picture in a reference layer is not used for an inter-layer prediction of the current block, wherein when the flag information indicate that a specific picture in the reference layer is not used for the inter-layer prediction, the specific picture is not comprised in a reference picture set, and wherein the flag information is received through a slice segment header, and in all slice segment header of the picture in the reference layer, a value of the flag information is set to the same, and the value of the flag information is equal to one of 0 and 1.