Method and system for image fusion based on Curvelet transformation

A technology of image fusion and transformation coefficient, applied in image enhancement, image analysis, image data processing and other directions, can solve the problem of SAR images with high spatial resolution, poor image quality, low spatial resolution, and inability to detect spectral information of objects in the image. problems, to achieve the effect of improving spectral distortion problems, improving spatial resolution, and saving time

Inactive Publication Date: 2017-09-12
TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in the prior art, the image quality of SAR image with high spatial resolution is poor, its image cannot detect the spectral information of ground objects, and its spatial resolution is low

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  • Method and system for image fusion based on Curvelet transformation
  • Method and system for image fusion based on Curvelet transformation
  • Method and system for image fusion based on Curvelet transformation

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Embodiment 1

[0051] Such as figure 1 with figure 2 As shown, an image fusion method based on Curvelet transform in the first embodiment includes the following steps:

[0052] S1: Perform image interpolation on the original hyperspectral image to obtain a new hyperspectral image with the same pixel size as the SAR image;

[0053] In this example 1, we first perform image interpolation on the original hyperspectral image, so that a new hyperspectral image with the same pixel size as the SAR image can be obtained through image interpolation, that is, the same pixel size as the SAR image HS images. The purpose of this is to further improve the accuracy of the original hyperspectral image.

[0054] S2, HIS transformation is performed on the new hyperspectral image to obtain the I, S and H components, and the SAR image is gray-scale stretched to obtain the SAR * image;

[0055] In this embodiment 1, we perform HIS transformation on the new hyperspectral image obtained in step S1 above, and segment the...

Embodiment 2

[0102] Such as image 3 As shown, this embodiment 2 relates to an image fusion system based on Curvelet transformation, which includes: an image interpolation module, an image processing module, a Curvelet transformation module, and a fusion image module;

[0103] The image interpolation module is used to perform image interpolation on the original hyperspectral image to obtain a new hyperspectral image with the same pixel size as the SAR image;

[0104] The image processing module is used to perform HIS transformation on the new hyperspectral image to obtain I, S and H components, and simultaneously perform gray-scale stretching on the SAR image to obtain SAR * image;

[0105] The Curvelet transform module, which is used to compare the I component and SAR * The images are respectively subjected to Curvelet transform to obtain Curvelet transform coefficients, and the Curvelet transform coefficients are fused according to the fusion rules to obtain new Curvelet transform coefficients; ...

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Abstract

The invention relates to a method and a system for image fusion based on Curvelet transformation. The method comprises the following steps: interpolating an original hyper-spectral image to get a new hyper-spectral image; carrying out HIS transformation to get components I, S and H, and stretching the gray of an SAR image to get an SAR* image; carrying out Curvelet transformation, and carrying out fusion according to fusion rules to get a new Curvelet transformation coefficient; and finally, carrying out inverse Curvelet transformation to get a component I*, and carrying out inverse HIS transformation on the component I* and the components S and H to get a fused image. The invention further relates to a system which comprises an image interpolation module, an image processing module, a Curvelet transformation module, and an image fusion module. The spectral distortion of fused images is improved, and the spatial resolution is increased greatly.

Description

Technical field [0001] The invention belongs to the field of multi-source high-resolution satellite remote sensing image fusion, and in particular relates to an image fusion method and system based on Curvelet transformation. Background technique [0002] In 1982, Haydn first applied the HIS (Hue-Intensity-Saturation) method to remote sensing image fusion. The HIS method first selects the appropriate band as the RGB three-channel data in the multispectral image to generate RGB color images, and then transform the color images In the HIS transformation space, the high-resolution image to be fused is gray-scale stretched to replace the I component, and finally the HIS inverse transformation is performed to obtain the fused image. The HIS fusion method is a simple and widely used image fusion method. [0003] However, the HIS fusion method requires that the contrast-stretched high-resolution image is not only highly correlated with the brightness component, but also close to the spect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/40G06T5/50
CPCG06T3/4007G06T3/4061G06T5/50G06T2207/20221
Inventor 李盛阳杨松张万峰
Owner TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI
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