System and method for performing image data conversion using intraprediction modes

• US 10,595,042 B2
• Filed: 04/15/2019
• Issued: 03/17/2020
• Est. Priority Date: 07/18/2011
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Sasai, Hisao, Nishi, Takahiro, Shibahara, Youji, Sugio, Toshiyasu, Tanikawa, Kyoko, Matsunobu, Toru
• Primary Examiner(s): Moyer, Andrew M
• Application Number:
  US16/384,144
• Publication Number:
  US 20190246140A1
• Time in Patent Office: 337 Days
• Field of Search: 382238, 382239
• CPC Class Codes: G06T 9/004 Predictors, e.g. intraframe, interframe coding
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/184 the unit being bits, e.g. of the compressed video stream
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• 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 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/91 Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

Abstract

A method for coding multiple binary data into a bitstream is disclosed. The method splits each of four luma binary data into a luma context-dependent segment and a luma context-independent segment, and splits one chroma binary data into a chroma context-dependent segment and a chroma context-independent segment. The method groups first coded data including four coded luma context-dependent segments, second coded data including four coded luma context-independent segments and third coded data including a coded chroma context-dependent segment and a coded chroma context-independent segment. The method further performs, separately, context adaptive binary arithmetic coding on the first coded data and the chroma context-dependent segment using a variable probability. The method also performs, separately, bypass coding on the second coded data and the chroma context-independent segment using a fixed probability.

Claims

1. A method for coding an image block to generate a bitstream including four luma binary data and one chroma binary data, each of the four luma binary data indicating a luma intra prediction mode used to predict luma samples in each of four subblocks constituting the image block, and each of the four luma binary data comprising a luma context-dependent segment and a luma context-independent segment, the one chroma binary data indicating a chroma intra prediction mode used to predict chroma samples in the image block, and the one chroma binary data comprising a chroma context-dependent segment and a chroma context-independent segment, the method comprising:

splitting each of the four luma binary data into a luma context-dependent segment and a luma context-independent segment;

splitting the one chroma binary data into a chroma context-dependent segment and a chroma context-independent segment;

grouping first coded data including four coded luma context-dependent segments, second coded data including four coded luma context-independent segments and third coded data including a coded chroma context-dependent segment and a coded chroma context-independent segment;

performing context adaptive binary arithmetic coding on the first coded data using a variable probability to generate coded luma context-dependent segments, and separately performing context adaptive binary arithmetic coding on the chroma context-dependent segment to generate a coded chroma context-dependent segment;

performing bypass coding on the second coded data using a fixed probability to generate coded luma context-independent segments, and separately performing bypass coding on the chroma context-independent segment to generate a coded chroma context-independent segment,

wherein the bitstream includes, in a following order, the coded luma context-dependent segments, the coded luma context-independent segments, the coded chroma context-dependent segment and the coded chroma context-independent segment.