Methods for deriving decoder-side motion vector derivation

A technology of motion vector and end motion, applied in the field of data encoding/decoding

Inactive Publication Date: 2016-04-27
MEDIATEK INC
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Problems solved by technology

For example, the templates used in the TM full search mechanism are limited to inverted L-shaped templates with a fixed template size, almost all supported MB types require flags encoded in the bitstream, and the highest precision of MV is limited to 1 / 4 pixel accuracy, and the candidate-based search mechanism only uses the MV of the left block and the upper right block (or the upper left block)

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  • Methods for deriving decoder-side motion vector derivation
  • Methods for deriving decoder-side motion vector derivation
  • Methods for deriving decoder-side motion vector derivation

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[0025] Certain terms are used in the description and claims to refer to particular elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that the first device is coupled to the second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0026] The present invention provides an example of DMVD desi...

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Abstract

A method for deriving decoder-side motion vector derivation (DMVD) comprises the following steps: setting the DMVD derived motion vector precision through a DMVD deriving module; comprising: taking specific motion vector precision as the DMVD deriving motion vector precision, wherein the specific motion vector precision is different from the non-DMVD derived motion vector precision; and according to the DMVD derived motion vector precision, determining the final motion vector of the DMVD derived target block. The provided method can improve the decoding efficiency, reduce the search complexity, and improve the agility.

Description

technical field [0001] The present invention relates to a data encoding / decoding method, and particularly relates to a decoder-side motion vector derivation (Decoder-side Motion Vector Derivation, hereinafter referred to as DMVD) method. Background technique [0002] In video coding, the temporal and spatial correlations found in image sequences can be exploited to reduce bitrate / enhance coding efficiency. Generally speaking, motion compensated inter-frame prediction (motioncompensated inter-frame prediction) greatly affects the final compression efficiency. Motion information such as motion vector (MV) data and reference image index is obtained at the encoder and encoded in the bitstream, so the decoder can simply perform motion compensation prediction based on the decoded motion information. However, encoding of motion information requires a high bit rate. Therefore, a DMVD mechanism is proposed. [0003] A template matching (Template Matching, hereinafter referred to a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/51H04N19/523H04N19/567
CPCH04N19/56H04N19/46H04N19/523
Inventor 黄毓文蔡玉宝傅智铭雷少民
Owner MEDIATEK INC
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