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Image quality and constrained code rate based JPEG2000 code rate control method

A technology of image quality and bit rate control, applied in the field of bit rate control, can solve problems such as inability to guarantee image quality, and achieve the effect of increasing computational complexity

Inactive Publication Date: 2009-07-15
XIAOSHAN IND RES INST
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Problems solved by technology

[0019] The purpose of the present invention is to overcome the defect that the existing JPEG2000 compression algorithm only adopts the code stream constraint when the code stream is controlled, and cannot guarantee the image quality, thereby providing a code that conforms to JPEG2000 and combines image quality constraints and code stream constraints. flow control method

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  • Image quality and constrained code rate based JPEG2000 code rate control method
  • Image quality and constrained code rate based JPEG2000 code rate control method
  • Image quality and constrained code rate based JPEG2000 code rate control method

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Embodiment Construction

[0047] The JPEG2000 code rate control method based on image quality and code rate constraints of the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0048] Compared with the prior art, the JPEG2000 code rate control method based on image quality and code rate constraints of the present invention not only meets the code rate constraints in the JPEG2000 standard code rate control PCRD-opt method, but also adds the conditions of image quality constraints. When the image bit rate threshold requirement is met, the image quality threshold requirement is met. Code rate control model of the present invention is as follows:

[0049] Min ( R ) R ≤ R ...

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Abstract

The invention discloses a method for controlling a JPEG2000 code rate based on image quality and code rate constraint, which comprises an inputting image which is used for setting the image quality constraint and the code rate constraint; the method also comprises the following processes: a compression image distortion threshold is initialized and a rate-distortion slope Lambada <MIN> and Lambada <MAX> in binary search is initialized; the present rate-distortion slope is renovated so that Lambada = (Lambada <MIN>+ Lambada <max) / 2; the present code rate R and the distortion D of the image are calculated; the code rate R, distortion D and an optimal truncation slope which meet the image distortion threshold and the code rate threshold are calculated by using the binary search. The invention can realize accomplishing the code rate control at the same time of coding based on the JPEG2000 code rate control and realize the code rate control based on the image quality and the code rate constraint in the condition of not adding calculating complexity.

Description

technical field [0001] The invention relates to a code rate control method in JPEG2000 image compression, in particular to a JPEG2000 code rate control method based on image quality and code rate constraints. Background technique [0002] The JPEG2000 compression algorithm is currently being widely used in the field of image compression because of its superior performance. The core of the code rate control in the JPEG2000 compression algorithm is the rate-distortion optimization problem, that is, the minimum distortion while reaching a given code rate. In the JPEG2000 standard, the PCRD-opt (Post-Compression Rate-Distortion optimization) algorithm is used for code rate control. This code rate control optimizes and truncates the code stream after arithmetic coding, that is, truncates the code stream according to the code rate constraint. In order to meet the reserved code stream and achieve the best compressed image quality (that is, the least distortion). [0003] Assuming...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/41H04N7/26G06T9/00H04N19/147
Inventor 李玲王贞松
Owner XIAOSHAN IND RES INST
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