Image coding method based on JND model

An image coding and model technology, applied in the field of image coding based on visual characteristics, can solve the problems of staying in the compression idea, less considering the visual redundancy characteristics, and increasing the computational complexity of coding efficiency, so as to increase the quantization intensity and reduce the compression code. rate, and the effect of improving coding efficiency
CN103297773AInactive Publication Date: 2013-09-11FUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
FUZHOU UNIV
Publication Date
2013-09-11
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention relates to an image coding method based on a JND model. After the DCT conversion of an image is completed, a module formed by quantization, inverse quantization reconstruction, JND threshold value estimation and an enhanced quantizer further increases a quantifying step size, removes visual redundancy, reduces the compression code rate in the condition of maintaining visual quality, and improves code efficiency. The method can accurately track the quality of compressed images according to the needs of a user on compression code rate, and provide accurate JND threshold values to design quantized enhanced values. In addition, a modified JND threshold estimation method enables extra bit expense not to be necessarily added to a coding end, and the code stream generated by a designed encoder is maintained to be compatible with a JPEG coding standard.
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Description

technical field

[0001] The patent of the present invention relates to an image coding method based on a JND (Just Noticeable Difference, JND) model, in particular to an image coding method based on visual characteristics. Background technique

[0002] In image processing and transmission, the JPEG standard is a widely used image storage and transmission format. It is an international standard for still image compression coding developed by the Joint Photographic Experts Group JPEG (Joint Photographic Experts Group) under the International Organization for Standardization (ISO). .

[0003] The JPEG standard encoding method is attached figure 1 As shown, it mainly includes image input, DCT transformation, quantization and entropy coding modules. Although this encoding technology has been widely recognized in the industry, it is based on Shannon's information theory, uses classical set theory as a tool, and uses probability and statistics models to describe information source...

Claims

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