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SAR image fusion method based on multiple-dimension geometric analysis

A technology of image fusion and geometric analysis, applied in the field of image fusion, it can solve the problems of ringing effect and inability to mine edge information well, and achieve the effect of ensuring clarity and improving information content.

Active Publication Date: 2009-05-27
XIDIAN UNIV
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Problems solved by technology

However, the disadvantage of this fusion method based on wavelet transform is that it cannot mine the edge information in the image very well, and it will produce "ringing effect" phenomenon and block phenomenon

Method used

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  • SAR image fusion method based on multiple-dimension geometric analysis
  • SAR image fusion method based on multiple-dimension geometric analysis
  • SAR image fusion method based on multiple-dimension geometric analysis

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Embodiment Construction

[0054] refer to figure 1 , the present invention realizes the steps of SAR image fusion as follows:

[0055] In step 1, image fusion based on wavelet transform is performed on the two source images respectively, and the fusion rule of taking the maximum value of the modulo is adopted to obtain the fusion result, which is recorded as img_wave.

[0056] 1a. Use discrete wavelet transform to decompose two SAR source images img1 and img2 obtained by different sensors, the number of decomposition layers is 3, and the "db1" type wavelet is used; the source image img1 corresponds to the wavelet coefficient w1, and the source image img2 Correspondingly, the wavelet coefficient w2 is obtained;

[0057] 1b. The wavelet coefficients w1 and w2 are fused using the fusion rule based on the modulus maximum value, namely:

[0058] w_wave(x, y)=Max{w1(x, y), w2(x, y)} (1)

[0059] In the formula, x represents the number of rows of wavelet coefficients w1 or w2, y represents the number of co...

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Abstract

The invention discloses an SAR image fusion method based on a multi-scale geometric analysis tool and belongs to the field of image processing technology; and the method mainly solves the problems that the prior fusion method has phenomenon of fuzzy and massive detailed compositions. The method is realized through the following steps: (1) two source images are subjected to image fusion respectively based on wavelet transformation to obtain a fusion result img_wave; (2) the two source images are subjected to image fusion based on Contourlet conversion to obtain a fusion result img_cont; (3) information entropy, average gradient and standard deviation of the two fusion results img_wave and img_cont are calculated respectively; (4) the information entropy, average gradient and standard deviation of the image fusion result img_wave based on wavelet transformation and the information entropy, average gradient and standard deviation of the image fusion result img_cont based on Contourlet conversion are compared so as to judge the quality of the fusion results; and (5) according to a judgment result, secondary fusion is selected. The SAR image fusion method improves the information content of the fused image, ensures the definition of the image and can be used for fusion of an SAR image, a natural image and a medical image.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image fusion method, which can be used for the fusion of synthetic aperture radar images, that is, SAR images, general natural images and medical images. Background technique [0002] As an important branch of multi-source data fusion, image fusion has become a research hotspot in the field of image engineering in recent years. It is a new technology for comprehensive processing of images from different sources. For two-dimensional images, the purpose of fusion is to extract and synthesize information from multiple source images, so as to obtain more accurate images of the same scene or target. , comprehensive and more reliable image descriptions. Using image fusion technology can improve the reliability and automation level of target recognition. Due to the imaging mechanism of SAR images, the obtained images contain a certain amount of multiplicative noise. The no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50G06T5/00
Inventor 焦李成王爽刘帆侯彪刘芳杨淑媛马文萍钟桦王桂婷
Owner XIDIAN UNIV
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