# US 10,484,691 B2 · Image coding method and apparatus using spatial predictive coding of chrominance and image decoding method and apparatus

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- Number: US 10,484,691 B2
- Document ID: US10484691B2
- Status: Granted
- Kind: B2
- Application number: 16/259,300
- Filed: 2019-01-28
- Published: 2019-05-23
- Granted: 2019-11-19
- Earliest claimed: 2002-09-30
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Woo-shik Kim; Chang-yeong Kim; Yang-seock Seo
- Web page: https://patentgrep.com/patent/US10484691B2

## CPC

- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- G06T 9/004: {Predictors, e.g. intraframe, interframe coding}
- G06T 9/005: {Statistical coding, e.g. Huffman, run length coding}
- 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 19/11: among a plurality of spatial predictive coding modes
- H04N 19/122: Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
- H04N 19/14: Coding unit complexity, e.g. amount of activity or edge presence estimation (H04N19/146 takes precedence)
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/186: the unit being a colour or a chrominance component
- H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
- H04N 19/593: involving spatial prediction techniques
- H04N 19/61: in combination with predictive coding
- H04N 19/182: the unit being a pixel
- H04N 19/184: the unit being bits, e.g. of the compressed video stream
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

A coding method including dividing pixels of a chrominance component of an input image into blocks having a predetermined size; selecting one among a direct current prediction method, a vertical prediction method, a horizontal prediction method, and a hybrid prediction method according to a user's input; generating a prediction value of each pixel in a current block to be predictively coded, using at least one pixel value among pixel values in an upper reference block adjacent to the current block and in a side reference block adjacent to the current block, according to the selected prediction method; generating a differential value between the prediction value and a corresponding real pixel value in the current block; and coding the differential value and information on the selected prediction method using a predetermined coding method.

## Claims

### Claim 1

A method of processing a color component in a video, the method comprising:
obtaining a residual value of the color component from a bitstream;
checking information related to intra prediction from the bitstream, for a current prediction block of the color component;
generating, performed by using at least one processor, a prediction value for the current prediction block of the color component, by performing the intra prediction on the current prediction block in response to checking of the information related to the intra prediction from the bitstream; and
reconstructing the current prediction block of the color component by using the prediction value and the residual value,
wherein the generating the prediction value for the current prediction block of the color component comprises performing the intra prediction,
based on an intra prediction mode determined from a neighboring block of the current prediction block of the color component, the neighboring block being located on at least one of a left side of the current prediction block of the color component or an upper side of the current prediction block of the color component, or
based on an intra prediction mode from among a plurality of intra prediction modes as indicated by the information related to the intra prediction from the decoded bitstream, the plurality of intra prediction modes include a direct current (DC) prediction mode, a vertical prediction mode and a horizontal prediction mode.