Method, medium, and apparatus encoding and/or decoding an image using the same coding mode across components

• US 9,877,007 B2
• Filed: 03/12/2015
• Issued: 01/23/2018
• Est. Priority Date: 11/14/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Dae-sung, Kim, Hyun-mun, Kim, Woo-shik, Birinov, Dmitri
• Primary Examiner(s): Li, Tracy Y
• Application Number:
  US14/656,147
• Publication Number:
  US 20150189252A1
• Time in Patent Office: 1,048 Days
• CPC Class Codes: H04N 11/02 with bandwidth reduction H04N11/04 , H04N11/24 take precedence
• CPC Class Codes: H04N 11/042 Codec means
• CPC Class Codes: H04N 19/109 among a plurality of temporal predictive coding modes
• CPC Class Codes: H04N 19/11 among a plurality of spatial predictive coding modes
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/147 according to rate distortion criteria rate-distortion as a criterion for motion estimation H04N19/567
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/18 the unit being a set of transform coefficients
• CPC Class Codes: H04N 19/182 the unit being a pixel
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/19 using optimisation based on Lagrange multipliers
• CPC Class Codes: H04N 19/196 being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters processing of motion vectors H04N19/513
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/463 by compressing encoding parameters before transmission
• CPC Class Codes: H04N 19/50 using predictive coding H04N19/61 takes precedence
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards
• CPC Class Codes: H04N 19/80 : Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation H04N19/635, H04N19/86 take precedence
• CPC Class Codes: H04N 19/91 : Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

Abstract

A method, medium, and apparatus encoding and/or decoding an image in order to increase encoding and decoding efficiency by performing binary-arithmetic coding/decoding on a binary value of a syntax element using a probability model having the same syntax element probability value for respective context index information of each of at least two image components.

Claims

1. A method of decoding an image, the method comprising:

obtaining a predicted direction of a luma component of a current block;

obtaining a predicted direction of a chroma component corresponding to the predicted direction of the luma component among a plurality of predicted directions according to one of predetermined decoding modes;

obtaining a predicted block based on the predicted direction of the chroma component;

obtaining information indicating whether at least one coefficient of which value is non-zero is included in a transform block of a predetermined size;

obtaining a residue by inverse-transforming the transform block using the information; and

restoring a current image by using the predicted block and the residue,

wherein the predicted direction of the chroma component is identical to the predicted direction of the luma component.

2. A non-transitory computer readable medium comprising computer readable code to control at least one processing device to implement a method of decoding an image, the method comprising:

obtaining a predicted direction of a luma component of a current block;

obtaining a predicted direction of a chroma component corresponding to the predicted direction of the luma component among a plurality of predicted directions according to one of predetermined decoding modes;

obtaining a predicted block based on the predicted direction of the chroma component;

obtaining information indicating whether at least one coefficient of which value is non-zero is included in a transform block of a predetermined size;

obtaining a residue by inverse-transforming the transform block using the information; and

restoring a current image by using the predicted block and the residue,

wherein the predicted direction of the chroma component is identical to the predicted direction of the luma component.