# US 10,321,154 B2 · Method and apparatus for signaling image information, and decoding method 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 10,321,154 B2 - Document ID: US10321154B2 - Status: Granted - Kind: B2 - Application number: 15/421,528 - Filed: 2017-02-01 - Published: 2017-05-18 - Granted: 2019-06-11 - Earliest claimed: 2011-09-22 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hendry Hendry; Seungwook Park; Jaehyun Lim; Yongjoon Jeon; Chulkeun Kim; Jungsun Kim; Naeri Park; Byeongmoon Jeon; Joonyoung Park - Web page: https://patentgrep.com/patent/US10321154B2 ## CPC - H04N 19/577: Motion compensation with bidirectional frame interpolation, i.e. using B-pictures - H04N 19/423: characterised by memory arrangements (H04N19/433 takes precedence) - H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder - H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) - 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 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract The present invention relates to a method for signaling image information and to a decoding method using same. The method for signaling image information according to the present invention comprises: a step of performing inter-prediction for a current picture; and a step of signaling information including the result of said inter-prediction and reference picture information indicating reference pictures usable in said inter prediction, wherein said reference picture information contains pieces of picture order count (POC) information of said usable reference pictures. The POC information of said usable reference pictures in said reference picture information is configured such that POCs for the pictures existing before said current picture in tents of a POC sequence are located at the front, and POCs for the pictures existing after said current picture in terms of a POC sequence are located following the POCs located at the front. ## Claims ### Claim 1 A video decoding method performed by a decoding apparatus including at least one of a processor and a memory, the method comprising: receiving, by the processor and through a slice header, picture order count (POC) information for configuring a reference picture set including reference pictures; deriving, by the processor, POC values of the reference pictures in the reference picture set based on the POC information; configuring, by the processor, the reference picture set including the reference pictures based on the POC values of the reference pictures; and performing, by the processor, an inter prediction on a current block based on the reference picture set to generate a predicted sample of the current block, wherein a POC value of an i-th reference picture is derived based on a POC difference specified by the POC information, wherein the POC information in the slice header includes POC difference value information, wherein the POC difference value information specifies the POC difference between a current picture and the i-th reference picture if the i is equal to 0, and wherein the POC difference value information specifies the POC difference between the i-th reference picture and an (i−1)-th reference picture if the i is greater than 0. ### Claim 2 (depends on 1) The method of claim 1, wherein the step of obtaining the POC information for configuring the reference picture set includes deriving POC differences for reference pictures previous to the current picture in a POC order, in a descending order of the POC order, and deriving the POC differences for the reference pictures subsequent to the current picture in the POC order, in an ascending order of the POC order. ### Claim 3 (depends on 2) The method of claim 2, wherein POC differences for the reference pictures previous to the current picture in the POC order have a negative sign, and wherein POC differences for the reference pictures subsequent to the current picture in the POC order have a positive sign. ### Claim 4 (depends on 1) The method of claim 1, wherein the POC information for configuring the reference picture set includes a first number information for specifying the number of reference pictures previous to the current picture in a POC order and a second number information for specifying the number of reference pictures subsequent to the current picture in the POC order, wherein the step of obtaining the POC information for configuring the reference picture set includes: deriving information elements for specifying the POC differences of the reference pictures previous to the current picture in the POC order by the number specified by the first number information; and deriving information elements for specifying the POC differences of the reference pictures subsequent to the current picture in the POC order by the number specified by the second number information. ### Claim 5 (depends on 1) The method of claim 1, further comprising: deriving a reference picture list based on an order of the reference pictures in the reference picture set, wherein the inter prediction is performed based on the reference picture list derived from the reference picture set. ### Claim 6 (depends on 5) The method of claim 5, wherein the order of the reference pictures in the reference picture set includes an order of a descending order of POC values for the reference pictures previous to the current picture in the POC order out of the reference pictures in the reference picture set, and an order of an ascending order of POC values for the reference pictures subsequent to the current picture in the POC order out of the reference pictures in the reference picture set. ### Claim 7 (depends on 6) The method of claim 6, wherein indices are allocated based on the descending order of POC values to the reference pictures previous to the current picture in the POC order and then indices are allocated based on the ascending order of POC values to the reference pictures subsequent to the current picture in the POC order for the reference picture list. ### Claim 8 (depends on 6) The method of claim 6, wherein indices are allocated based on the ascending order of POC values to the reference pictures subsequent to the current picture and then indices are allocated based on the descending order of POC values are allocated to the reference pictures previous to the current picture in the POC order for the reference picture list. ### Claim 9 (depends on 5) The method of claim 5, wherein deriving the reference picture list includes deriving the reference picture list based on a first order based on a descending order of POC values of the reference pictures previous to the current picture in the POC order out of the reference pictures in the reference picture set; and a second order based on an ascending order of POC values of the reference pictures subsequent to the current picture in the POC order out of the reference pictures in the reference picture set, wherein indices are allocated to the reference pictures previous to the current picture based on the first order, indices are allocated to the reference pictures subsequent to the current picture based on the second order, and then indices are allocated to long-term reference pictures when the reference picture list is a reference picture list 0, and wherein indices are allocated to the reference pictures subsequent to the current picture based on the second order, indices are allocated to the reference picture previous to the current picture based on the first order, and then indices are allocated to long-term reference pictures when the reference picture list is a reference picture list 1. ### Claim 10 A decoding apparatus for video decoding, comprising: a processor configured to: receive, through a slice header, picture order count (POC) information for configuring a reference picture set including reference pictures; derive POC values of the reference pictures of the reference picture set including the reference pictures based on the POC information; configure the reference picture set based on the POC values of the reference pictures; and perform an inter prediction on a current block based on the reference picture set to generate a predicted sample of the current block; and a memory configured to store the reference pictures, wherein a POC value of an i-th reference picture is derived based on a POC difference specified by the POC information, wherein the POC information in the slice header includes POC difference value information, wherein the POC difference value information specifies the POC difference between a current picture and the i-th reference picture if the i is equal to 0, and wherein the POC difference value information specifies the POC difference between the i-th reference picture and an (i−1)-th reference picture if the i is greater than 0. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the processor is configured to: derive the POC differences for reference pictures previous to the current picture in a POC order, in a descending order of the POC order; and derive the POC differences for the reference pictures subsequent to the current picture in the POC order, in an ascending order of the POC order. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein POC differences for the reference pictures previous to the current picture in the POC order have a negative sign, and wherein POC differences for the reference pictures subsequent to the current picture in the POC order have a positive sign. ### Claim 13 (depends on 10) The apparatus of claim 10, wherein the POC information for configuring the reference picture set includes a first number information for specifying the number of reference pictures previous to the current picture in a POC order and a second number information for specifying the number of reference pictures subsequent to the current picture in the POC order, and wherein the at least one processor is configured to: derive information elements for specifying the POC differences of the reference pictures previous to the current picture in the POC order by the number specified by the first number information; and derive information elements for specifying the POC differences of the reference pictures subsequent to the current picture in the POC order by the number specified by the second number information. ### Claim 14 (depends on 10) The apparatus of claim 10, wherein the at least one processor is further configured to derive a reference picture list based on an order of the reference pictures in the reference picture set, wherein the inter prediction is performed based on the reference picture list derived from the reference picture set. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the order of the reference pictures in the reference picture set includes: an order of a descending order of POC values for the reference pictures previous to the current picture in the POC order out of the reference pictures in the reference picture set; and an order of an ascending order of POC values for the reference pictures subsequent to the current picture in the POC order out of the reference pictures in the reference picture set. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein indices are allocated based on the descending order of POC values to the reference pictures previous to the current picture in the POC order and then indices are allocated based on the ascending order of POC values to the reference pictures subsequent to the current picture in the POC order for the reference picture list. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein indices are allocated based on the ascending order of POC values to the reference pictures subsequent to the current picture and then indices are allocated based on the descending order of POC values are allocated to the reference pictures previous to the current picture in the POC order for the reference picture list. ### Claim 18 (depends on 14) The apparatus of claim 14, wherein the at least one processor is configured to derive the reference picture list based on a first order based on a descending order of POC values of the reference pictures previous to the current picture in the POC order out of the reference pictures in the reference picture set; and a second order based on an ascending order of POC values of the reference pictures subsequent to the current picture in the POC order out of the reference pictures in the reference picture set, wherein indices are allocated to the reference pictures previous to the current picture based on the first order, indices are allocated to the reference pictures subsequent to the current picture based on the second order, and then indices are allocated to long-term reference pictures when the reference picture list is a reference picture list 0, and wherein indices are allocated to the reference pictures subsequent to the current picture based on the second order, indices are allocated to the reference picture previous to the current picture based on the first order, and then indices are allocated to long-term reference pictures when the reference picture list is a reference picture list 1.