Restraint method for SAR image spot noise combining visual light image information

An image information and speckle noise technology, applied in the field of image processing, can solve the problem of inaccurate edge detail detection, and achieve the effect of good edge retention performance and good speckle reduction effect.

Inactive Publication Date: 2009-09-23
BEIHANG UNIV
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Problems solved by technology

The disadvantage of this processing is that edge details are detected in the original SAR image before speckle noise suppression, so edge detail detection may be inaccurate due to speckle noise

Method used

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  • Restraint method for SAR image spot noise combining visual light image information
  • Restraint method for SAR image spot noise combining visual light image information
  • Restraint method for SAR image spot noise combining visual light image information

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Embodiment Construction

[0016] Such as figure 1 Shown, the realization step of the present invention mainly comprises:

[0017] 1. Pixel area attribute classification. Using the optical image information, the pixels are divided into three types: uniform area, gradually changing area and edge detail area.

[0018] 2. SAR image classification noise suppression. According to the category of the pixels, the speckle noise suppression processing of the SAR image is divided into different situations.

[0019] Such as figure 2 As shown, the specific processing of regional attribute classification using optical images mainly includes:

[0020] (1) Perform a gradient operation on the optical image f(i, j) to obtain a gradient map f t (i,j)

[0021] f t ( i , j ) = [ f ( i ...

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Abstract

A method for suppressing speckle noise in a SAR image combined with visible light image information, the steps of which are: (1) classify pixel point area attributes, and use optical image information to divide pixel points into three types: uniform area, slowly changing area and edge detail area; (2) According to the category of the pixels, the speckle noise of the SAR image classification is suppressed respectively. The present invention uses visible light images to divide SAR images into three types of image areas: uniform area, slowly changing area and edge detail area, and then uses different noise suppression operations in different image areas; Visible light image information can accurately classify the region; (2) the most suitable speckle reduction operation is used in the uniform area and the slowly changing area, which can obtain the best speckle reduction effect; (3) the edge detail area adopts edge-keeping processing, so The best edge-preserving performance can be obtained.

Description

technical field [0001] The invention relates to a SAR image speckle noise suppression method combined with visible light image information, which belongs to the field of image processing. Background technique [0002] SAR is an all-weather, all-time, high-resolution microwave imaging system, which has the ability to penetrate natural vegetation, artificial camouflage and surface soil at a certain depth. The coherent imaging principle of SAR leads to coherent speckle noise in SAR images. In addition, occasional faults and image encoding / decoding errors will cause spikes and pulse noise when the equipment is working. These noises are collectively referred to as speckle noise. Speckle noise is unavoidable in SAR images. Its existence makes the image unable to correctly reflect the scattering characteristics of ground objects, which not only greatly increases the complexity of interpretation, but also easily causes misjudgment, and greatly increases the automatic The difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/217H04N5/14
Inventor 徐华平周芳
Owner BEIHANG UNIV
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