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Image coding code rate control method based on video coding standards

A technology of image coding and bit rate control, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of unbalanced quality and inaccurate bit rate control.

Active Publication Date: 2016-10-05
北京博雅慧视技术有限公司
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Problems solved by technology

[0016] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a code rate control method for image coding based on video coding standards, and solves the problem of code rate control caused by the code rate control algorithm of the above-mentioned one-time coding through the method of secondary encoding. The problem of unbalanced standards and quality

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  • Image coding code rate control method based on video coding standards
  • Image coding code rate control method based on video coding standards
  • Image coding code rate control method based on video coding standards

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Embodiment Construction

[0067] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0068] The invention provides a code rate control method for image coding based on a video coding standard, which solves the problems of inaccurate code rate control and unbalanced quality caused by a code rate control algorithm of a primary coding method through a secondary coding method. Specifically, according to the calculated initial quantization parameters, in the first encoding, the quantization parameters or quantization steps used in each area are calculated according to the region-level code rate control, and according to the quantization parameters and step sizes of each area in the first encoding The length and other information calculate the initial quantization parameters that need to be used in the second encoding. After calculating the quantization parameters of the current CTU, the cu...

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Abstract

The invention discloses an image coding code rate control method based on video coding standards. The image coding code rate is accurately controlled in a secondary coding method, a first coding process comprises steps of acquiring frame-level initial quantization parameters for first coding, quantization parameters of a currently to-be-coded CTU (Coding Tree Unit) and initial quantization parameters needed by second coding; and the initial quantization parameters needed by second coding acquired in the first coding process are used as frame-level initial quantization parameters for second coding. The method solves problems of inaccurate code rate control and unbalanced quality caused by a code rate control algorithm in a primary coding method through the secondary coding method, the subjective and objective performance of the coded image is improved obviously, and image coding requirements can be met.

Description

technical field [0001] The invention relates to image compression technology, in particular to an image coding rate control method based on video coding standards. Background technique [0002] The new generation of static image compression standard JPEG2000 is currently the mainstream image coding compression standard, which is widely used in the field of static images such as natural images, computer images, medical images, remote sensing images and compound texts. At the beginning of 2013, the ITU-T video coding expert group and the MPEG expert group jointly developed HEVC, the third-generation video compression coding standard. The third-generation video compression coding standard HEVC adopts a new one-time coding based on the R-λ model, and its frame-level initial quantization parameter QP init The calculation of is obtained according to formula 1: [0003] λ = α ( ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/13H04N19/124H04N19/146
Inventor 杨名远张广耀宋磊贾惠柱解晓东
Owner 北京博雅慧视技术有限公司
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