# US 2025/0168352 A1 · Image encoding/decoding method and device, and recording medium on which bitstream is stored > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0168352 A1 - Document ID: US20250168352A1 - Status: Published application - Kind: A1 - Application number: 18/727,626 - Filed: 2023-01-06 - Published: 2025-05-22 - Earliest claimed: 2022-01-09 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyeongmoon Jang - Web page: https://patentgrep.com/patent/US20250168352A1 ## CPC - H04N 19/137: Motion inside a coding unit, e.g. average field, frame or block difference - H04N 19/52: by predictive encoding - 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 19/176: the region being a block, e.g. a macroblock - H04N 19/523: with sub-pixel accuracy - H04N 19/577: Motion compensation with bidirectional frame interpolation, i.e. using B-pictures - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An image encoding/decoding method and device according to the present disclosure enable: a motion vector of the current block to be derived on the basis of a merge inter mode; first and second prediction blocks of the current block to be respectively generated on the basis of first and second motion vectors; and a prediction block of the current block to be generated on the basis of the first prediction block and/or the second prediction block. Here, the motion vector of the current block comprises a first motion vector in a first direction and a second motion vector in a second direction, wherein the first motion vector is derived on the basis of a first inter prediction mode and the second motion vector can be derived on the basis of a second inter prediction mode. ## Claims ### Claim 1 An image decoding method, comprising: deriving a motion vector of a current block based on a merge inter mode, wherein the motion vector of the current block includes a first motion vector in a first direction and a second motion vector in a second direction, the first motion vector is derived based on a first inter prediction mode, and the second motion vector is derived based on a second inter prediction mode; generating a first prediction block and a second prediction block of the current block based on the first motion vector and the second motion vector, respectively; and generating a prediction block of the current block based on at least one of the first prediction block or the second prediction block. ### Claim 2 (depends on 1) The method of claim 1, wherein the first inter prediction mode is an AMVP mode, and the second inter prediction mode is a merge mode. ### Claim 3 (depends on 2) The method of claim 2, wherein the first prediction block is generated based on the first motion vector and a motion vector difference signaled from a bitstream. ### Claim 4 (depends on 3) The method of claim 3, further comprising: obtaining an index for an adaptive motion vector resolution of the current block from the bitstream, wherein the index indicates any one of a plurality of motion vector resolution candidates pre-defined in a decoding apparatus. ### Claim 5 (depends on 4) The method of claim 4, wherein the first motion vector in the first direction and the motion vector difference are converted to have a motion vector resolution according to the index. ### Claim 6 (depends on 5) The method of claim 5, wherein the second motion vector in the second direction is not converted to have the motion vector resolution according to the index. ### Claim 7 (depends on 4) The method of claim 4, wherein the index is obtained for at least one of the first motion vector in the first direction or the motion vector difference, and wherein the index is shared for a motion vector in the second direction. ### Claim 8 (depends on 3) The method of claim 3, wherein at least one of the first motion vector in the first direction or the motion vector difference is converted based on an index for an adaptive motion vector resolution, and wherein the index indicates any one of a plurality of motion vector resolution candidates pre-defined in a decoding apparatus. ### Claim 9 (depends on 8) The method of claim 8, wherein the index is derived based on any one of a plurality of merge candidates belonging to a merge candidate list according to the merge mode. ### Claim 10 (depends on 4) The method of claim 4, wherein the index for the adaptive motion vector resolution of the current block is propagated to a block with later decoding order than the current block. ### Claim 11 An image encoding method, comprising: deriving a motion vector of a current block based on a merge inter mode, wherein the motion vector of the current block includes a first motion vector in a first direction and a second motion vector in a second direction, the first motion vector is derived based on a first inter prediction mode, and the second motion vector is derived based on a second inter prediction mode; generating a first prediction block and a second prediction block of the current block based on the first motion vector and the second motion vector, respectively; and generating a prediction block of the current block based on at least one of the first prediction block or the second prediction block. ### Claim 12 A computer-readable storage medium storing a bitstream generated by an image encoding method, the image encoding method comprising: deriving a motion vector of a current block based on a merge inter mode, wherein the motion vector of the current block includes a first motion vector in a first direction and a second motion vector in a second direction, the first motion vector is derived based on a first inter prediction mode, and the second motion vector is derived based on a second inter prediction mode; generating a first prediction block and a second prediction block of the current block based on the first motion vector and the second motion vector, respectively; and generating a prediction block of the current block based on at least one of the first prediction block or the second prediction block.