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Image coding method and device based on contourlet transform

A technology of contourlet transformation and image coding, which is applied in the field of image processing, can solve the problems of poor coding effect and low coding efficiency of its own characteristics, and achieve the effect of improving coding efficiency and effect

Active Publication Date: 2022-01-25
COMMUNICATION UNIVERSITY OF CHINA
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Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide a method and device for image coding based on contourlet transform, to solve the low coding efficiency caused by the fact that the contourlet transform does not consider the characteristics of the sub-bands in each direction in the existing image coding method, The problem of poor coding effect

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  • Image coding method and device based on contourlet transform
  • Image coding method and device based on contourlet transform

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Embodiment Construction

[0035] The accompanying drawings illustrate embodiments of the present invention. Those skilled in the art would recognize that the described embodiments can be modified in various ways or combinations thereof without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Also, in this specification, the drawings are not drawn to scale, and like reference numerals denote like parts.

[0036] Combine below Figure 1-Figure 3 This embodiment will be described in detail.

[0037] figure 1 is a schematic flow chart of the image coding method based on contourlet transform according to the present invention, as figure 1 As shown, the image coding method based on contourlet transform comprises the following steps:

[0038] S1 extracts the original image;

[0039] S2 performs multi-scale decomposition of the original image through contourlet transformation, and ...

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Abstract

The invention discloses an image coding method based on contourlet transform, comprising the following steps: S1 extracting an original image; S2 performing multi-scale decomposition on the original image through contourlet transform to obtain multiple subbands, and in the multi-scale decomposition Add entropy judgment conditions to stop the decomposition of subbands in time; S3 quantizes the decomposed multiple subband coefficients; S4 encodes and decodes the quantized subband coefficients in turn; S5 performs contourlet inversion on the decoded subband coefficients Transform, to reconstruct the original image. The present invention sets the energy entropy threshold of the multi-scale decomposed sub-bands by adding entropy judgment conditions in the contourlet transform, fully considers the characteristics of each sub-band itself, and stops the decomposition in time for the sub-bands that do not need to be further decomposed. Thereby improving coding efficiency and effect. The invention also discloses an image coding device based on contourlet transformation, which uses the above-mentioned method for image coding.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image encoding method and device based on contourlet transformation. Background technique [0002] In the field of image compression coding research, the link of image transformation is very important. Transformation is to convert a large amount of image data in the spatial domain to the transformation domain and express it with a small amount of data, so as to improve the efficiency and effect of image coding compression. There are many forms of image transformation such as DCT transform, Fourier transform, wavelet transform, etc., but the basis function of this transformation is isotropic, and the direction of transformation is limited. When dealing with high-Vitch heterogeneous curves, curved surfaces or natural images, the original sparse representation cannot be achieved. effect of the function. "Multi-scale geometric analysis" is a mathematical transfor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00
CPCG06T9/007
Inventor 方力徐庆红叶龙钟微张勤
Owner COMMUNICATION UNIVERSITY OF CHINA
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