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Method and system for context-based adaptive binary arithmetic coding

A context and encoder technology, applied in the field of adaptive binary arithmetic coding methods and systems, which can solve problems such as non-optimal methods

Inactive Publication Date: 2006-12-06
NOKIA TECHNOLOGLES OY
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Problems solved by technology

[0070] Although the CABAC arithmetic coding method employed in the high-complexity class of ITU-T Recommendation H.26L TML 8 provides improvements in data compression compared to the UVLC entropy coding method, the method still suffers in terms of coding efficiency. not optimal

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  • Method and system for context-based adaptive binary arithmetic coding
  • Method and system for context-based adaptive binary arithmetic coding

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[0157] The first embodiment of the present invention is described in detail in section 1.1 below. This embodiment relates to a context-based binary arithmetic encoder suitable for use in, for example, the image coding system defined in ITU-T Recommendation H.26L Used in. In this embodiment, the level value generated by performing run-level coding on the quantized coding coefficients of the transform coding block of the image pixel is assigned to the context in consideration of another transform coefficient level belonging to the same block.

[0158] The second embodiment of the present invention is described in detail in Section 1.2. This embodiment also relates to a context-based binary arithmetic encoder for image coding systems, where the system may be, for example, ITU-T Recommendation H.26L The image coding system defined in. In the second embodiment, the run value generated by run-level coding on the quantized DCT transform coefficients of the transform coding block of the i...

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Abstract

A method of image coding wherein an image is divided into blocks having a plurality of pixels. A transform coding operation is performed on a block of pixels to produce a corresponding block of transform coefficient values, which is scanned to produce a scanned array of coefficient values represented by a plurality of number pairs having a first and a second number. The first and second numbers are assigned to one of a plurality of contexts (14) representative of the number pairs. The first number of a number pair is assigned to a context based on a first number of another number pair. Alternatively, the second number of a number pair is assigned to a context based on the first number of the number pair (16). Furthermore, a number indicative of the number of non-zero coefficient values in the block of transform coefficient values is determined and assigned to a context.

Description

[0001] This application is a divisional application of the patent application with application number 02822672.0. Technical field [0002] The present invention generally relates to still image and video sequence compression, and more particularly to a context-based adaptive binary arithmetic coding method and system. Background technique [0003] A digital image in uncompressed form contains an array of image pixels or primitives. For example, in a common digital image format known as the Quarter Common Intermediate Format (QCIF), the image or frame contains 25,344 pixels arranged in an array of 176×144 pixels. Each pixel is represented by a certain number of bits in turn, and they convey information about the brightness (brightness) and / or color (chromaticity) of the pixel. In addition, there are different schemes for representing brightness and / or chroma in digital images. The so-called YUV color model is usually used. The brightness or Y component represents the pixel brightne...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24G06T9/00
Inventor M·卡策维茨R·库尔切伦
Owner NOKIA TECHNOLOGLES OY
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