Level set method for edge detection of SAR images of airport roads

An edge detection and level set technology, applied in the field of image processing, can solve the problems of unable to obtain edge detection effect, unable to effectively overcome noise interference, unable to obtain satisfaction, etc., to avoid excessive manual intervention, improve accuracy, and overcome noise. the effect of interference
CN101982835AActive Publication Date: 2011-03-02XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2011-03-02

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Abstract

The invention discloses a level set based method for edge detection of SAR images, which mainly overcomes the defect that the existing methods for edge detection of SAR images can not well suppress the impacts of speckle noises. The method comprises the following steps: (1) inputting the SAR images and carrying out median filtering and brightness transform in sequence to obtain the enhanced images; (2) manually selecting initialized seed points on the enhanced images and beginning area growth; (3) carrying out morphological close operation and removal operation on the area growth result in sequence to obtain the edge profile of the smoothened destination area; (4) obtaining a level set evolved initialized zero level set according to the edge profile of the destination area, which is obtained through area growth; and (5) carrying out level set evolution until the preset iterative evolution frequency is met to obtain the final edge profile of the destination area. The method can effectively overcome the impacts of speckle noises of the SAR images on edge detection, is accurate in edge detection and can be used for edge detection of the SAR images of airport runways and roads.
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Description

technical field

[0001] The invention belongs to the technical field of image processing and relates to image edge detection, in particular to a level set-based SAR image airport road edge detection method, which can be used for edge detection of synthetic aperture radar images. Background technique

[0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar. SAR has all-weather, multi-polarization, multi-view, multi-depression angle data acquisition capabilities and the ability to penetrate some ground objects, so it is not only widely used in military, but also in agriculture, meteorology, topography, disaster monitoring and other civil applications. There are also tons of applications. However, since SAR emits coherent waves, these coherent waves undergo coherent effects with ground objects, especially the backscattering effect of ground objects, which causes the target echo signal to attenuate. This attenuation is manifested in the image as coherent speckl...

Claims

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