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A Filtering Method for Sea Surface SAR Image

An image and filtering area technology, applied in the field of filtering sea surface SAR images, can solve the problems of edge blurring, unsatisfactory image noise suppression effect, weak sea surface microwave scattering signal, etc., and achieve the effect of image noise suppression.

Inactive Publication Date: 2018-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microwave scattering signal on the sea surface is weak, and the use of filters such as mean value, median value, and Lee will blur the edges of the image, making it more difficult to identify oil spills
However, the wavelet filter commonly used at present is not very effective in suppressing the image noise of the sea surface with good consistency.

Method used

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  • A Filtering Method for Sea Surface SAR Image
  • A Filtering Method for Sea Surface SAR Image
  • A Filtering Method for Sea Surface SAR Image

Examples

Experimental program
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Embodiment

[0066] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:

[0067] SAR (Synthetic Aperture Radar): synthetic aperture radar;

[0068] figure 1 It is a specific implementation flowchart of a filtering method for sea surface SAR images of the present invention.

[0069] In this example, if figure 1 Shown, a kind of filtering method to sea surface SAR image of the present invention comprises the following steps:

[0070] S1, image preprocessing

[0071] Extract the SAR image of the sea surface and process it into a grayscale image to obtain the original grayscale image; Carry out radiometric calibration, geocoding and filtering on the image, that is, perform radiometric correction on the image to link the pixel with the scattering characteristics of the ground object; perform geometric correction to deal with the geometric distortion of the image; perform filtering to eliminate unwanted speckle noise;...

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Abstract

The invention discloses a filtering method for sea surface SAR images, which combines the maximum inter-class variance method and the morphological filtering method to filter images of marine oil spills; specifically, the binary image of the image is obtained by the maximum inter-class variance method, Then the binary image is expanded twice and corroded twice respectively; the gray value of the image after subtraction from the gray value of the image after erosion is used to obtain the binary image of the local area including the boundary; finally, the local area and the original image The inner product of the gray scale can simplify the original image, leaving only the filtered area including the boundary of the oil spill and the suspected oil spill, and finally filter the filtered area through the filter template.

Description

technical field [0001] The invention belongs to the technical field of SAR image processing, and more specifically relates to a filtering method for sea surface SAR images. Background technique [0002] The research on SAR speckle suppression technology has always been an important topic in SAR imaging processing and image analysis. Coherence speckle is a deterministic interference phenomenon inherent in the SAR image itself, because the ground resolution unit is always much larger than the wavelength of the radar wave, so each resolution unit on the ground can be regarded as composed of multiple scattering points. These scattering points are at different distances from the radar receiver, and the resulting echoes are coherently superimposed. Since the echo phase of each scattering center is random, the amplitude and phase of the total echo signal vary randomly. Therefore, a relatively uniform ground area has drastic changes in grayscale in the SAR image, some resolution u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/20G06T5/30G06T7/11
CPCG06T5/20G06T5/30G06T2207/10032G06T5/80G06T5/70
Inventor 陈彦尹福全童玲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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