# US 2014/0192889 A1 · Method and an apparatus for decoding a video signal

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- Number: US 2014/0192889 A1
- Document ID: US20140192889A1
- Status: Published application
- Kind: A1
- Application number: 14/205,591
- Filed: 2014-03-12
- Published: 2014-07-10
- Earliest claimed: 2008-10-06
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seung Wook Park; Jung Sun KIM; Young Hee CHOI; Byeong Moon Jeon; Joon Young PARK
- Web page: https://patentgrep.com/patent/US20140192889A1

## CPC

- H04N 19/513: Processing of motion vectors
- H04N 19/132: Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
- H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence)
- H04N 19/573: Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
- H04N 19/61: in combination with predictive coding
- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A method of processing a video signal is disclosed. The present invention includes obtaining a current macroblock type, obtaining skip or direct mode indication information on a partition of the current macroblock according to the current macroblock type, deriving a motion vector of the partition according to the skip or direct mode indication information, and predicting a pixel value of the partition using the motion vector. Accordingly, the present invention obtains a pixel value of a reference block close to an original video using a motion vector, thereby enhancing a reconstruction ratio of the macroblock. As a macroblock uses skip or direct prediction indication information, it is unnecessary to separately code skip mode indication information and direct mode indication information on the macroblock, whereby an information size to be coded can be reduced.

## Claims

### Claim 1

(canceled)

### Claim 2

A method of decoding video data in a coded video data bitstream with a decoding apparatus, the method comprising:
constructing, with the decoding apparatus, a motion vector predictor list of a current block, the motion vector predictor list including at least two motion vector candidates, the motion vector candidates including motion vectors of neighboring blocks adjacent to the current block, list index information being assigned to each of the motion vector candidates;
obtaining, with the decoding apparatus, motion vector index information of the current block from block-level data in the coded video data bitstream, the motion vector index information specifying a motion vector candidate to be used for the current block of the motion vector candidates;
deriving, with the decoding apparatus, a motion vector predictor of the current block from the motion vector candidate having the list index information corresponding to the obtained motion vector index information;
obtaining, with the decoding apparatus, a motion vector difference of the current block;
deriving, with the decoding apparatus, a motion vector of the current block by using the derived motion vector predictor and the motion vector difference; and
predicting, with the decoding apparatus, a pixel value of the current block based on the derived motion vector.

### Claim 3 (depends on 2)

The method of claim 2, wherein the neighboring blocks include blocks located at a left side and an upper side of the current block.

### Claim 4 (depends on 2)

The method of claim 2, further comprising:
obtaining, with the decoding apparatus, prediction mode information of the current block, the prediction mode information indicating whether the current block is coded in an intra mode or in an inter mode,
wherein the motion vector predictor of the current block is derived when the prediction mode information indicates the current block is coded in the inter mode.