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AssigneeSamsung Electronics Co., Ltd.
InventorsWoo-jin Han, Kyo-hyuk Lee, Jae-young Lee, Sang-chang Cha, Bae-keun Lee, Ho-jin Ha
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A method and apparatus of improving the compression efficiency of a motion vector by efficiently predicting a motion vector in an enhancement layer from a motion vector in a base layer in a video coding method using a multi-layer are provided. The method includes obtaining a motion vector in a base layer frame having a first frame rate from an input frame, obtaining a motion vector in a first enhancement layer frame having a second frame rate from the input frame, the second frame rate being greater than the first frame rate, generating a predicted motion vector by referring to a motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame if there is no base layer frame at the same temporal position as the first enhancement layer frame, and coding a difference between the motion vector in the first enhancement layer frame and the generated predicted motion vector, and the obtained motion vector in the base layer.
A method for efficiently compressing multi-layered motion vectors, the method comprising:
A method for efficiently encoding multi-layered motion vectors, the method comprising:
A multi-layered video encoding method comprising:
A multi-layered video decoding method comprising:
A multi-layered video decoding method comprising:
Dependencies are inferred from the claim text.
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Motion estimation or motion compensation: motion compensation with bidirectional frame interpolation, i.e. using B-pictures
Using hierarchical techniques, e.g. scalability: in the temporal domain
Involving temporal prediction: motion estimation or motion compensation
Processing of motion vectors: by encoding
About 3 years 2 months of term left · ends 14 Dec 2029 (estimated)
1. Field of the Invention
The present invention relates to a video compression method, and more particularly, to a method and apparatus of improving the compression efficiency of a motion vector by efficiently predicting a motion vector in an enhancement layer from a motion vector in a base layer in a video coding method using a multi-layer structure.
2. Description of the Related Art
The above and other features and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
FIG. 1 shows an overall configuration of a general scalable video coding system;
FIG. 2 is a diagram of video coding using a multi-layered structure;
The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. Advantages and features of the present invention and methods of accomplishing the same may be understood more readily by reference to the following detailed description of exemplary embodiments and the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims. Like reference numerals refer to like elements throughout the specification.
The more accurately the motion prediction is performed, the less the overhead due to a motion vector becomes. Unlike in a case where motion vectors in lower layers, i.e., MV0 and MV1, are used as estimation motion vectors MV1p and MV2p, in a case where a more accurate motion estimation method is employed, as shown in FIG. 4, the motion vectors MV0 and MV1 demonstrate the same moving effect as vectors 11 and 13. That is, unlike in the conventional art in which a differential value 12 between a motion vector in a current layer and a motion vector in a lower layer of the current layer and a differential value 14 between a motion vector in a second enhancement layer and the motion vector in the current layer are transmitted, in a case where the estimation motion vectors MV1p and MV2p are used for more accurate motion estimation, smaller values D1 and D2 have only to be stored. Accordingly, bit amounts needed for motion vectors can be reduced and bits corresponding to the reduced bit amounts are allocated to textures, thereby enhancing picture quality levels.
To achieve this, first, a process of generating the estimation motion vectors MV1p and MV2p should be performed just by reading motion information of a lower layer without additional information. Second, the motion vectors referenced should be set to be substantially close to motion vectors in the current layer.