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A two-value arithmetic coding method of digital signal

A binary arithmetic, digital signal technology, applied in the field of binary arithmetic coding

Inactive Publication Date: 2005-11-30
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

So when calculating R LPS keep P LPS Estimating too high a precision doesn't make sense

Method used

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  • A two-value arithmetic coding method of digital signal

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Embodiment Construction

[0069] 1) In the first aspect, we propose a small-probability value selection point in binary arithmetic coding and calculate the corresponding interval R of the small-probability symbol LPS Methods:

[0070] a)P LPS Quantification of:

[0071] i. In the interval (0, 0.5], according to 2 -k-1 Take points and divide them into K sub-intervals, k, K is a positive integer, k=1, 2, 3, ... K;

[0072] ii. In these k subintervals, each average selection N=2 L points. That is, the probability value of the small probability symbol corresponding to the i-th point in the k-th interval is:

[0073] P(k i )=2 -k-1 +2 -k-1 ×2 -L × i

[0074] b) Quantization of Range:

[0075] According to the method of the following formula, Range is expressed with the precision of M bits in the initial calculation, but when calculating R LPS , the precision of M-B bits is preserved.

[0076] range_l=Range>>B

[0077] c)R LPS The calculation of:

[0078...

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Abstract

This invention relates to signal process arithmetic coding field and relates to image or video coding method, which is characterized by the following: designing new small possibility quantity scheme and the coding range and uses the displacement and adding technique to reduce the possibility of the complexity.

Description

technical field [0001] The invention relates to binary arithmetic coding in digital signal coding such as image / video signals, and relates to a related computer implementation method, and belongs to the field of coding and decoding in signal processing. Background technique [0002] C.E.Shannon, the father of information theory, clarified the relationship between probability and information redundancy in mathematical language for the first time. In the paper "A Mathematical Theory of Communication" published in 1948, Shannon pointed out that any information has redundancy, and the size of the redundancy is related to the probability or uncertainty of each symbol (number, letter or word) in the information . Shannon borrowed the concept of thermodynamics, called the average amount of information in information after excluding redundancy as "information entropy", and gave a mathematical expression for calculating information entropy. In essence, the purpose of data compressi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/91
Inventor 何芸余薇吴捷
Owner TSINGHUA UNIV
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