Back to results
US 9,544,589 B2Granted
Method of predicting a motion vector for a current block in a current picture
AssigneeLG Electronics Inc.
InventorsByeong Moon Jeon, Yoon Seong Soh
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeLG Electronics Inc.
InventorsByeong Moon Jeon, Yoon Seong Soh
Estimating the term…
A method of predicting a forward motion vector for a current block in a current picture includes obtaining, by the moving picture decoding device, at least three motion vectors for at least three blocks other than the current block based on a direction of a reference picture, wherein the direction of the reference picture is based on a display order of the reference picture and a display order of the current picture, and the at least three blocks are not in an intra mode, predicting, by the moving picture decoding device, the forward motion vector for the current block by using a median operation of the at least three motion vectors and decoding the current block in the current picture using the predicted forward motion vector for the current block.
A method of predicting a motion vector for a current block in a current picture by a moving picture decoding device, the method comprising:
A moving picture decoding device, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Selection of coding mode or of prediction mode: selection of the reference unit for prediction within a chosen coding or prediction mode, e.g.…
Motion inside a coding unit, e.g. average field, frame or block difference: analysis of motion vectors, e.g. their magnitude, direction, variance…
The unit being an image region, e.g. an object: the region being a block, e.g. a macroblock
Methods or arrangements for coding, decoding, compressing or decompressing digital video signals: decoders specially adapted therefor, e.g. video…
Term ended 6 Jan 2023 (estimated)
Field of the Invention
The present invention relates to a moving picture coding system, and more particularly to a prediction motion vector calculation method by defining a motion vector to be used in a median operation when a neighboring block around a block to be coded has a plurality of motion vectors, so as to obtain a prediction motion vector (PMV) of the block to be coded; using motion vector information of neighboring blocks, and improve a coding efficiency.
Description of the Related Art
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail example embodiments thereof with reference to the attached drawings in which:
FIG. 1 is a view illustrating the calculation of a prediction motion vector of a block E using motion vectors of neighboring blocks A, B and C.
FIG. 2 illustrates a process of determining a direction of a motion vector for a current block in a picture to be decoded according to an example embodiment of the present invention.
If a neighboring block of a block to be coded is in a bi-predictive mode (or a direct mode), motion vectors MVFW and MVBW (or MVf and MVb) thereof may have the same directions such as forward/forward and backward/backward, or different directions such as forward/backward. This direction information of the motion vectors cannot be determined from only motion vector syntaxes ‘MVFW’ and ‘MVBW’ or reference picture indexes ‘ref_idx_fwd’ and ‘ref_idx_bwd’. For this reason, there is a need to acquire the direction information by referring to different unique information held by reference pictures.
This invention proposes a method for acquiring direction information of motion vectors by comparing the display orders of reference pictures, and calculating a prediction motion vector PMV on the basis of the acquired direction information.
Now, example embodiments of the present invention will be described in detail with reference to the annexed drawing.