SAR Image Denoising Method Based on Homogeneous Region Segmentation

A homogeneous area and image technology, applied in the field of image processing, can solve the problem that the homogeneous area does not get the denoising effect, and the weak target points are difficult to maintain.

Inactive Publication Date: 2015-12-09
XIDIAN UNIV
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Problems solved by technology

Although this method can smooth the speckle noise to the greatest extent while maintaining the edge and texture details of the SAR image, it still has the disadvantage that the weighted average between homogeneous points cannot have a good sparse representation of the image, and the homogeneous area has not been compared. Good denoising effect, weak target points are also difficult to maintain

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  • SAR Image Denoising Method Based on Homogeneous Region Segmentation
  • SAR Image Denoising Method Based on Homogeneous Region Segmentation
  • SAR Image Denoising Method Based on Homogeneous Region Segmentation

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Embodiment Construction

[0065] The present invention will be further described below in conjunction with the accompanying drawings.

[0066] Refer to attached figure 1 , the concrete steps of the present invention are as follows:

[0067] Step 1: Input image.

[0068] Input optional synthetic aperture radar SAR image of a single polarization magnitude map.

[0069] Step 2: Obtain the logarithmically transformed image.

[0070] Perform a logarithmic transformation on the gray value of each pixel in a synthetic aperture radar SAR image read in, and replace the gray value of the pixel with the logarithmically transformed value of the gray value of each pixel to obtain a Logarithmically transform the image.

[0071] Step 3: Determine the homogeneous area of ​​the central pixel.

[0072] 3a) Starting from the first line of the logarithmically transformed image, find out the first pixel whose gray value is non-zero, and use the non-zero pixel as Center pixel, saving the spatial position of the center...

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Abstract

The invention discloses an SAR image denoising method based on homogeneous region division. The method includes the steps of (1) inputting an image, (2) obtaining a logarithmic transformation image, (3) determining a homogeneous region of a center pixel, (4) obtaining homogeneous regions of all center pixels, (5) carrying out PPB denoising, (6) calculating standard deviation of each homogeneous region, (7) calculating the area, (8) carrying out KSVD sparse denoising on each homogeneous region, (9) synthetizing the image, and (10) outputting a result. The SAR image denoising method has the advantages of being capable of effectively restraining noise of the homogeneous regions, well keeping strong and weak target points, keeping edges clear and eliminating edge scratches and block effects, and can be used for denoising of SAR images.

Description

technical field [0001] The invention belongs to the technical field of image processing, and further relates to a SAR image denoising method based on homogeneous region segmentation in the field of SAR image denoising. The invention can be used for SAR image speckle reduction processing. Background technique [0002] Synthetic Aperture Radar (SAR), as an active radar, has the characteristics of not being affected by light and weather conditions. It can observe the earth all-weather and all-weather, and can also obtain information through the surface and vegetation. It is widely used in agriculture, forestry, geology and military fields. Wide range of applications. The existence of speckle noise in SAR images due to the coherent effect of scattering echoes from imaging scatterers is not conducive to the automatic analysis of scenes in the images and the understanding of SAR images, making image interpretation difficult, especially for strong and weak SAR images. The influenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/00
Inventor 王桂婷焦李成接道伟侯彪马文萍马晶晶张小华田小林杨淑媛
Owner XIDIAN UNIV
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