# US 12,604,033 B2 · Motion vector coding with input motion vector data > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,033 B2 - Document ID: US12604033B2 - Status: Granted - Kind: B2 - Application number: 18/699,079 - Filed: 2022-10-05 - Published: 2025-02-27 - Granted: 2026-04-14 - Earliest claimed: 2021-10-05 - Assignees: InterDigital CE Patent Holdings, SAS - Applicants: InterDigital CE Patent Holdings, SAS - Inventors: Tangi Poirier; Antoine Robert; Edouard Francois; Franck Galpin - Web page: https://patentgrep.com/patent/US12604033B2 ## CPC - H04N 19/58: Motion compensation with long-term prediction, i.e. the reference frame for a current frame not being the temporally closest one (H04N19/23 takes precedence) - H04N 19/52: by predictive encoding - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Systems, methods, and instrumentalities are disclosed for performing motion compensation with long-term history-based motion vector predictor candidate(s). A device configured for performing such motion compensation may include a processor. The processor may be configured to obtain a long-term motion vector predictor candidate. The processor may also be configured to add the long-term motion vector predictor candidate to a history-based motion vector prediction (HMVP) list for a current block. The processor may also be configured to decode the current block using the HMVP list having the long-term motion vector prediction candidate. ## Claims ### Claim 1 A video decoding device, the device comprising: a processor configured to: obtain a long-term motion vector predictor candidate; add the long-term motion vector predictor candidate to a history-based motion vector prediction (HMVP) list for a current block, the HMVP list comprising the added long-term motion vector predictor candidate and a plurality of HMVP candidates derived based on a plurality of previously coded blocks; and decode the current block using the HMVP list. ### Claim 2 (depends on 1) The device of claim 1, wherein the long-term motion vector predictor candidate is obtained from video data. ### Claim 3 (depends on 2) The device of claim 2, wherein the long-term motion vector predictor candidate is obtained from the video data at one or more of a frame level, slice level, coding tree unit (CTU) row level, or CTU level. ### Claim 4 (depends on 1) The device of claim 1, wherein the processor is further configured to: obtain an enablement indicator configured to indicate whether a long-term motion vector predictor candidate mode is enabled, wherein the long-term motion vector candidate is obtained based on the enablement indicator indicating that the long-term motion vector predictor candidate mode is enabled. ### Claim 5 (depends on 1) The device of claim 1, wherein the processor is further configured to: determine whether an indication of the long-term motion candidate is included in video data based on a long-term motion vector predictor candidate mode enablement indicator; and based on a condition that the long-term motion vector predictor candidate mode enablement indicator indicates that a long-term motion vector predictor candidate mode is enabled, obtain the long-term motion vector predictor candidate from the video data. ### Claim 6 (depends on 1) The device of claim 1, wherein the long-term motion vector predictor candidate is obtained based at least in part on input motion vector data (IMVD) received from outside of a bitstream. ### Claim 7 A method for video decoding, the method comprising: obtaining a long-term motion vector predictor candidate; adding the long-term motion vector predictor candidate to a history-based motion vector prediction (HMVP) list for a current block, the HMVP list comprising the added long-term motion vector predictor candidate and a plurality of HMVP candidates derived based on a plurality of previously coded blocks; and decoding the current block using the HMVP list. ### Claim 8 (depends on 7) The method of claim 7, wherein the long-term motion vector predictor candidate is obtained from video data. ### Claim 9 (depends on 8) The method of claim 8, wherein the long-term motion vector predictor candidate is obtained from the video data at one or more of a frame level, slice level, coding tree unit (CTU) row level, or CTU level. ### Claim 10 (depends on 7) The method of any of claim 7, wherein the method further comprises: obtaining an enablement indicator configured to indicate whether a long-term motion vector predictor candidate mode is enabled, wherein the long-term motion vector candidate is obtained based on the enablement indicator indicating that the long-term motion vector predictor candidate mode is enabled. ### Claim 11 (depends on 10) The method of claim 10, wherein the method further comprises: determining whether an indication of the long-term motion candidate is included in video data based on a long-term motion vector predictor candidate mode enablement indicator; and based on a condition that the long-term motion vector predictor candidate mode enablement indicator indicates that a long-term motion vector predictor candidate mode is enabled, obtaining the long-term motion vector predictor candidate from the video data. ### Claim 12 (depends on 10) The method of claim 10, wherein the long-term motion vector predictor candidate is obtained based at least in part on input motion vector data (IMVD) received from outside of a bitstream. ### Claim 13 A video encoding device, the device comprising: a processor configured to: obtain a long-term motion vector predictor candidate; add the long-term motion vector predictor candidate to a history-based motion vector prediction (HMVP) list for a current block, the HMVP list comprising the added long-term motion vector predictor candidate and a plurality of HMVP candidates derived based on a plurality of previously coded blocks; and encode the current block using the HMVP list. ### Claim 14 (depends on 13) The device of claim 13, wherein the processor is further configured to: determine whether to enable a long-term motion vector predictor candidate mode; and include, in video data, a long-term motion vector predictor candidate mode enablement indicator configured to indicate whether the long-term motion vector predictor candidate mode is enabled based on the determining. ### Claim 15 (depends on 14) The device of claim 14, wherein the long-term motion vector predictor candidate mode enablement indicator is included in least one of: a sequence parameter set, a picture header, or a slice header. ### Claim 16 (depends on 13) The device of claim 13, wherein the processor is further configured to: determine whether to enable a long-term motion vector predictor candidate mode; and based on a determination to enable the long-term motion vector predictor candidate mode, include an indication of the long-term motion vector predictor candidate in video data. ### Claim 17 A method for video encoding, the method comprising: obtaining a long-term motion vector predictor candidate; adding the long-term motion vector predictor candidate to a history-based motion vector prediction (HMVP) list for a current block, the HMVP list comprising the added long-term motion vector predictor candidate and a plurality of HMVP candidates derived based on a plurality of previously coded blocks; and encoding the current block using the HMVP list. ### Claim 18 (depends on 17) The method of claim 17, wherein the method further comprises: determining whether to enable a long-term motion vector predictor candidate mode; and including, in video data, a long-term motion vector predictor candidate mode enablement indicator configured to indicate whether the long-term motion vector predictor candidate mode is enabled based on the determining. ### Claim 19 (depends on 18) The method of claim 18, wherein the long-term motion vector predictor candidate mode enablement indicator is included in least one of: a sequence parameter set, a picture header, or a slice header. ### Claim 20 (depends on 17) The method of claim 17, wherein the method further comprises: determining whether to enable a long-term motion vector predictor candidate mode; and based on a determination to enable the long-term motion vector predictor candidate mode, including an indication of the long-term motion vector predictor candidate in video data.