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US 12,598,311 B2Granted
Method for processing image on basis of inter-prediction mode and apparatus therefor
AssigneeNokia Technologies Oy
InventorJaeho Lee
Life of this patent
Estimating the term…
Abstract
Disclosed are a method for decoding a video signal and an apparatus therefor. Specifically, a method for decoding an image based on an inter-prediction mode may include: configuring a merge candidate list by using motion information of a spatial candidate and a temporal candidate adjacent to a current block; parsing a first syntax element indicating a particular candidate applied to inter-prediction of the current block among a predefined number of candidates in the merge candidate list; deriving a refined candidate by adding a motion vector offset to a motion vector of a candidate indicated by the first syntax element; and generating a prediction block of the current block by using the motion information of the refined candidate.
Claims3
A decoding apparatus for image decoding, the decoding apparatus comprising:
- a memory;
- and
- at least one processor connected to the memory, the at least one processor configured to:
- obtain residual information of a current block from a bitstream;
- determine an inter prediction mode of the current block as a merge mode among the merge mode and a Motion Vector Prediction (MVP) mode;
- configure a merge candidate list based on motion information of a spatial candidate and a temporal candidate for the current block in the merge mode;
- obtain merge motion vector offset precision information related to whether a merge motion vector offset has a fractional pixel precision, wherein the merge motion vector offset precision information is obtained from a picture parameter set;
- determine a merge candidate used to derive a refined merge candidate based on the merge motion vector offset, wherein a merge candidate on 0th position of the merge candidate list is determined as the merge candidate used to derive a refined merge candidate based on the merge motion vector offset;
- derive motion information of the refined merge candidate based on a sum of the merge motion vector offset, which is derived based on the merge motion vector offset precision information, and a motion vector of the determined merge candidate;
- and
- derive a prediction block of the current block based on the motion information of the refined merge candidate;
- and
- derive a residual block of the current block based on the residual information;
- and
- generate a reconstructed block of the current block based on the prediction block and the residual block,
- wherein a merge candidate generated based on an average of a pair of predefined candidates is added in the merge candidate list after configuring the merge candidate list including the spatial candidate and the temporal candidate,
- wherein the pair of predefined candidates is a pair of a candidate on the 0th position and a candidate on 1st position of the merge candidate list, and
- wherein the merge motion vector offset is derived based on a value acquired by multiplying a merge motion vector offset precision by a non-zero integer.
15 more elements
An encoding apparatus for image encoding, the encoding apparatus comprising:
- a memory;
- and
- at least one processor connected to the memory, the at least one processor configured to:
- determine an inter prediction mode of a current block as a merge mode among the merge mode and a Motion Vector Prediction (MVP) mode;
- configure a merge candidate list based on motion information of a spatial candidate and a temporal candidate for the current block in the merge mode;
- determine a merge candidate used to derive a refined merge candidate based on a merge motion vector offset, wherein a merge candidate on 0th position of the merge candidate list is determined as the merge candidate used to derive a refined merge candidate based on the merge motion vector offset;
- derive motion information of the refined merge candidate based on a sum of the merge motion vector offset, which is derived based on merge motion vector offset precision information, and a motion vector of the determined merge candidate;
- derive a prediction block of the current block based on the motion information of the refined merge candidate;
- derive a residual block of the current block based on the prediction block of the current block;
- and
- generate video information including the merge motion vector offset precision information related to whether the merge motion vector offset has a fractional pixel precision and residual information for the residual block, wherein the merge motion vector offset precision information is included in a picture parameter set of the video information,
- wherein a merge candidate generated based on an average of a pair of predefined candidates is added in the merge candidate list after configuring the merge candidate list including the spatial candidate and the temporal candidate,
- wherein the pair of predefined candidates is a pair of a candidate on the 0th position and a candidate on 1st position of the merge candidate list, and
- wherein the merge motion vector offset is derived based on a value acquired by multiplying a merge motion vector offset precision by a non-zero integer.
11 more elements
An apparatus for transmitting data for an image, the apparatus comprising:
- at least one processor configured to obtain a bitstream of video information including merge motion vector offset precision information related to whether a merge motion vector offset has a fractional pixel precision and residual information for a residual block of the current block, wherein the merge motion vector offset precision information is included in a picture parameter set of the video information;
- and
- a transmitter configured to transmit the data including the bitstream of the video information including the merge motion vector offset precision information and the residual information,
- wherein a prediction block of the current block is derived by determining an inter prediction mode of the current block as a merge mode among the merge mode and a Motion Vector Prediction (MVP) mode, configuring a merge candidate list based on motion information of a spatial candidate and a temporal candidate for the current block in the merge mode, determining a merge candidate used to derive a refined merge candidate based on the merge motion vector offset, wherein a merge candidate on 0th position of the merge candidate list is determined as the merge candidate used to derive a refined merge candidate based on the merge motion vector offset, deriving motion information of the refined merge candidate based on a sum of the merge motion vector offset, which is derived based on the merge motion vector offset precision information, and a motion vector of the determined merge candidate,
- wherein a merge candidate generated based on an average of a pair of predefined candidates is added in the merge candidate list after configuring the merge candidate list including the spatial candidate and the temporal candidate,
- wherein the pair of predefined candidates is a pair of a candidate on the 0th position and a candidate on 1st position of the merge candidate list, and
- wherein the merge motion vector offset is derived based on a value acquired by multiplying a merge motion vector offset precision by a non-zero integer.
4 more elements
Dependencies are inferred from the claim text.