# US 8,542,742 B2 · Image information encoding method and encoder, and image information decoding method and decoder

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,542,742 B2
- Document ID: US8542742B2
- Status: Granted
- Kind: B2
- Application number: 13/712,477
- Filed: 2012-12-12
- Published: 2013-04-18
- Granted: 2013-09-24
- Earliest claimed: 2001-11-30
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: Kazushi Sato; Osamu Sunohara; Teruhiko Suzuki; Peter Kuhn; Yoichi Yagasaki
- Web page: https://patentgrep.com/patent/US8542742B2

## CPC

- H04N 19/109: among a plurality of temporal predictive coding modes
- H04N 7/01: Conversion of standards {, e.g. involving analogue television standards or digital television standards processed at pixel level}
- H04N 11/042: {Codec means}
- H04N 11/046: {DPCM}
- H04N 19/105: Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
- H04N 19/112: according to a given display mode, e.g. for interlaced or progressive display mode
- H04N 19/124: Quantisation
- H04N 19/136: Incoming video signal characteristics or properties
- H04N 19/139: Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
- H04N 19/152: by measuring the fullness of the transmission buffer
- H04N 19/16: for a given display mode, e.g. for interlaced or progressive display mode
- H04N 19/186: the unit being a colour or a chrominance component
- H04N 19/36: Scalability techniques involving formatting the layers as a function of picture distortion after decoding, e.g. signal-to-noise [SNR] scalability
- H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
- H04N 19/50: using predictive coding (H04N19/61 takes precedence)
- H04N 19/51: Motion estimation or motion compensation
- H04N 19/513: Processing of motion vectors
- H04N 19/523: with sub-pixel accuracy
- H04N 19/57: Motion estimation characterised by a search window with variable size or shape
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A motion compensation method includes performing a motion compensation of a decoded image signal including a luma signal and a chroma signal in a format in which the number of chroma pixels is vertically different from the number of luma pixels. The method further includes detecting a condition that a reference field has a different parity from a current field for a motion compensation. The method further includes controlling, in the detected condition, the motion compensation so as to vertically shift a phase of the chroma signal in the reference field so that the reference field will coincide in phase of the chroma signal with a current field.

## Claims

### Claim 1

A motion compensation method comprising:
performing a motion compensation of a decoded image signal including a luma signal and a chroma signal in a format in which the number of chroma pixels is vertically different from the number of luma pixels;
detecting a condition that a reference field has a different parity from a current field for a motion compensation; and
controlling, in the detected condition, the motion compensation so as to vertically shift a phase of the chroma signal in the reference field so that the reference field will coincide in phase of the chroma signal with a current field.

### Claim 2

A motion compensation apparatus comprising:
motion compensation means for performing a motion compensation of a decoded image signal including a luma signal and a chroma signal in a format in which the number of chroma pixels is vertically different from the number of luma pixels;
detecting means for detecting a condition that a reference field has a different parity from a current field for a motion compensation; and
controlling means for controlling, in the detected condition, the motion compensation so as to vertically shift a phase of the chroma signal in the reference field so that the reference field will coincide in phase of the chroma signal with a current field.

### Claim 3

A motion compensation apparatus comprising:
a motion estimation unit configured to perform a motion compensation of a decoded image signal including a luma signal and a chroma signal in a format in which the number of chroma pixels is vertically different from the number of luma pixels;
a detecting unit configured to detect a condition that a reference field has a different parity from a current field for a motion compensation; and
a controlling unit configured to control, in the detected condition, the motion compensation so as to vertically shift a phase of the chroma signal in the reference field so that the reference field will coincide in phase of the chroma signal with a current field.