Method for determining arithmetic encoding probability interval value based on JPEG (Joint Photographic Experts Group) 2000 standard

A probability interval and arithmetic coding technology, which is applied in the determination of the probability interval of arithmetic coding based on the JPEG2000 standard, and in the field of image compression coding, can solve problems such as pauses in coding processing, classification of double-context symbols, and inability to line up, so as to improve processing speed and reduce Internal memory bits, the effect of improving encoding speed and efficiency

CN101848387AInactive Publication Date: 2010-09-29XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-09-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for determining arithmetic encoding probability interval value based on JPEG (Joint Photographic Experts Group) 2000 standard. The problems to be mainly solved are that the prior method has low processing speed and a plurality of interior storage bits and cannot effectively update the probability interval values of any double text symbol pairs. The determination method comprises the following steps of: firstly, judging the types of the double text symbol pairs; secondly, acquiring the probability value of the corresponding small probability symbol from the probability value estimation table, respectively updating the probability interval values of the different types of the double text symbol pairs, and meanwhile, calculating the shift counting value of the probability interval value; and finally, outputting the updated probability interval value. The invention has the advantages of high processing speed and few interior storage bits and can be applied to the image compression encoding of various high-speed digital devices, in particular to the encoding of the high-speed real-time satellite remote image.
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Description

technical field

[0001] The invention relates to the technical field of image processing, in particular to a method for determining an arithmetic coding probability interval based on the JPEG2000 standard, which is used for image compression coding of various digital devices. Background technique

[0002] With the development of multimedia and network technology and its application in medical imaging, remote sensing images and digital image / video transmission, the existing still image compression standard JPEG can no longer meet the requirements of current practical applications. In November 2000, a new still image compression standard JPEG2000 was established. One of the core technologies of this standard is to use the arithmetic coding method to encode the data after wavelet transformation, so as to realize the compression processing of image data.

[0003] The coding principle of described arithmetic coding method is described as follows:

[0004] The input of the arithm...

Examples

Embodiment Construction

[0046] The coding method of the present invention adopts Xilinx ISE 9.1 integrated development software and VHDL, Verilog HDL language, realizes on the programmable chip that the model of Xilinx company is XC2V3000-6BG728.

[0047] refer to figure 1 , the method for determining the arithmetic coding probability interval value based on the JPEG2000 standard of the present invention comprises the following steps:

[0048] Step 1, read the double-coded index and double high probability symbol identification.

[0049] Simultaneously input the first context symbol pair (CX0, D0) and the second context symbol pair (CX1, D1), respectively use the first context symbol CX0 and the second context symbol CX1 as addresses, from the preset encoding index array Read the corresponding first coding index Index0 and the second coding index Index1, and the first high probability symbol identifier MPS_CX0 and the second high probability symbol identifier MPS_CX1 respectively corresponding to th...