Simplified Context Selection For Entropy Coding of Transform Coefficient Syntax Elements

Inactive Publication Date: 2013-01-03
TEXAS INSTR INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CABAC is a well known throughput bottleneck in video codec implementations, particularly in decoding.

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  • Simplified Context Selection For Entropy Coding of Transform Coefficient Syntax Elements
  • Simplified Context Selection For Entropy Coding of Transform Coefficient Syntax Elements
  • Simplified Context Selection For Entropy Coding of Transform Coefficient Syntax Elements

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Embodiment Construction

[0022]Specific embodiments of the invention will now be described in detail with reference to the accompanying figures. Like elements in the various figures are denoted by like reference numerals for consistency.

[0023]As used herein, the term “picture” may refer to a frame or a field of a frame. A frame is a complete image captured during a known time interval. The Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T WP3 / 16 and ISO / IEC JTC 1 / SC 29 / WG11 is currently developing the next-generation video coding standard referred to as High Efficiency Video Coding (HEVC). HEVC is expected to provide around 50% improvement in coding efficiency over the current standard, H.264 / AVC, as well as larger resolutions and higher frame rates. For convenience of description, some embodiments are described herein in reference to HEVC and use terminology from HEVC. One of ordinary skill in the art will understand that embodiments are not limited to HEVC.

[0024]Various versions of HEVC are descr...

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Abstract

A method for entropy encoding syntax elements of transform coefficient levels in a video encoder to generate a compressed video bit stream is provided that includes selecting a context for a first significant coefficient flag corresponding to a first transform coefficient level in a 32×32 transform block, wherein the first transform coefficient level is at a lowest frequency position in the 32×32 transform block, entropy encoding the first significant coefficient flag using the context, selecting the context for a second significant coefficient flag corresponding to a second transform coefficient level in a 16×16 transform block, wherein the second transform coefficient level is at a lowest frequency position in the 16×16 transform block, and entropy encoding the second significant coefficient flag using the context.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit of U.S. Provisional Patent Application Ser. No. 61 / 503,478, filed Jun. 30, 2011, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]Embodiments of the present invention generally relate to simplified context selection for entropy coding of transform coefficient syntax elements in video coding.[0004]2. Description of the Related Art[0005]Video compression, i.e., video coding, is an essential enabler for digital video products as it enables the storage and transmission of digital video. In general, video compression techniques apply prediction, transformation, quantization, and entropy coding to sequential blocks of pixels in a video sequence to compress, i.e., encode, the video sequence. Video decompression techniques generally perform the inverse of these operations in reverse order to decompress, i.e., decode, a compressed video sequenc...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N7/30
CPCH04N19/50H04N19/91H04N19/61H04N19/122H04N19/176H04N19/184H04N19/186H04N19/46H04N19/70
Inventor SZE, VIVIENNE
Owner TEXAS INSTR INC
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