# US 9,521,414 B2 · Method of deriving motion information

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- Number: US 9,521,414 B2
- Document ID: US9521414B2
- Status: Granted
- Kind: B2
- Application number: 15/049,965
- Filed: 2016-02-22
- Published: 2016-08-25
- Granted: 2016-12-13
- Earliest claimed: 2011-11-07
- Assignees: Infobridge Pte. Ltd.
- Applicants: Infobridge Pte. Ltd.
- Inventors: Soo Mi Oh; Moonock Yang
- Web page: https://patentgrep.com/patent/US9521414B2

## CPC

- H04N 19/124: Quantisation
- H04N 19/109: among a plurality of temporal predictive coding modes
- H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
- H04N 19/129: Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
- H04N 19/13: Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
- H04N 19/137: Motion inside a coding unit, e.g. average field, frame or block difference
- H04N 19/139: Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/198: {including smoothing of a sequence of encoding parameters, e.g. by averaging, by choice of the maximum, minimum or median value}
- H04N 19/463: by compressing encoding parameters before transmission
- H04N 19/503: involving temporal prediction (adaptive coding with adaptive selection between spatial and temporal predictive coding H04N19/107; adaptive coding with adaptive selection among a plurality of temporal predictive coding modes H04N19/109)
- H04N 19/513: Processing of motion vectors
- H04N 19/52: by predictive encoding
- H04N 19/593: involving spatial prediction techniques
- H04N 19/61: in combination with predictive coding
- H04N 19/86: involving reduction of coding artifacts, e.g. of blockiness
- H04N 19/91: Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A method is provided of decoding video data using a merge mode. A merge list is constructed using available spatial and temporal merge candidates. A merge candidate on the merge list corresponding to a merge index is determined as motion information of a current prediction unit. A predicted block of the current prediction unit is generated using the motion information. A transformed block is generated by inverse-quantizing a block of quantized coefficients using a quantization parameter. A residual block is generated by inverse-transforming the transformed block. A reconstructed block is generated using the predicted block and the residual block.

## Claims

### Claim 1

A method of decoding video data using a merge mode, the method comprising:
constructing a merge list using available spatial and temporal merge candidates;
determining a merge candidate on the merge list corresponding to a merge index as motion information of a current prediction unit;
generating a predicted block of the current prediction unit using the motion information;
generating a transformed block by inverse-quantizing a block of quantized coefficients using a quantization parameter;
generating a residual block by inverse-transforming the transformed block; and
generating a reconstructed block using the predicted block and the residual block,
wherein the merge list contains a predetermined number of merge candidates among the available spatial and temporal merge candidates,
wherein the quantization parameter is derived per a quantization unit,
wherein a minimum size of the quantization unit is adjusted per picture,
wherein the quantization parameter is derived using a differential quantization parameter and a quantization parameter predictor,
wherein if two or more quantization parameters are available among a left quantization parameter, an above quantization parameter and a previous quantization parameter of a current coding unit, the quantization parameter predictor is generated using two available quantization parameters determined according to a predetermined order among the left quantization parameter, the above quantization parameter and the previous quantization parameter,
wherein if a left and an above quantization parameter of a current coding unit are not available, a previous quantization parameter is set as the quantization parameter predictor,
wherein the differential quantization parameter is restored using a bin string indicating an absolute value of the differential quantization parameter and a bin indicating a sign of the differential quantization parameter, and
wherein the bin string and the bin are derived from a picture parameter set.

### Claim 2 (depends on 1)

The method of claim 1, wherein a reference picture index and a motion vector of the current prediction unit are a reference picture index and a motion vector of a merge candidate corresponding to the merge index.

### Claim 3 (depends on 2)

The method of claim 2, wherein a reference picture index of the temporal merge candidate is set as 0.

### Claim 4 (depends on 1)

The method of claim 1, wherein a motion vector of a temporal merge candidate is a motion vector of a temporal merge candidate block within a temporal merge candidate picture, and a position of the temporal merge candidate block is determined in a basis of a position of a current block within a largest coding unit (LCU).

### Claim 5 (depends on 4)

The method of claim 4, wherein the motion vector of the temporal merge candidate is a motion vector of a motion vector storing unit corresponding to the position of the temporal merge candidate block.

### Claim 6 (depends on 5)

The method of claim 5, wherein a size of the motion vector storing unit is 16×16.

### Claim 7 (depends on 1)

The method of claim 1, wherein if multiple coding units belong to the quantization unit, the quantization parameter for a first coding unit of the multiple coding units is derived and used for the multiple coding units.

### Claim 8 (depends on 1)

The method of claim 1, wherein if an absolute value of the differential quantization parameter is zero, the bin indicating the sign of the differential quantization parameter does not exist.

### Claim 9 (depends on 1)

The method of claim 1, wherein the predetermined order is an order of the left quantization parameter, the above quantization parameter and the previous quantization parameter.

### Claim 10 (depends on 1)

The method of claim 1, wherein if only one is available among the left quantization parameter, the above quantization parameter and the previous quantization parameter of the current coding unit, the available quantization parameter is set as the quantization parameter predictor.