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SAR image coastline extracting method based on geometric active contour model

A technology of geometric active contour and extraction method, which is applied in the field of SAR image coastline extraction based on geometric active contour model, can solve the problem that the edge information of the coastline cannot be accurately extracted, and achieves the effect of solving the weak boundary problem and saving detection time.

Inactive Publication Date: 2016-10-12
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

Therefore, it is impossible to effectively and accurately extract the edge information of the coastline from SAR images

Method used

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  • SAR image coastline extracting method based on geometric active contour model
  • SAR image coastline extracting method based on geometric active contour model
  • SAR image coastline extracting method based on geometric active contour model

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] figure 1 shown figure 1 It is a flowchart of an embodiment of the present invention. This embodiment method comprises the following steps:

[0038] (1) Use Matlab software to read the SAR image containing the coastline target to be extracted, and use the Lee filter to filter the SAR image of the coastline target to be extracted and adjust the brightness of the SAR image.

[0039] The Lee filter is a spatial domain filter algorithm based on a multiplicative noise model, which uses the local statistical characteristics of the SAR image to control the output of the filter, so that the Lee filter is adaptive to changes in the SAR image And implement speckle filtering on it.

[0040] (2) carry out convolution processing to described SAR image, generate grid sampling point, then draw a plurality of small disks as the initial profile of coastline in descr...

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Abstract

The invention discloses a SAR image coastline extracting method based on a geometric active contour model. The method comprises steps of: reading a SAR image including a to-be-extracted coastline target by using Matlab software, filtering the SAR image including the to-be-extracted coastline target by using a Lee filter and adjusting the brightness of the SAR image; (2) performing convolution on the SAR image to generate a grid sampling point, drawing multiple small discs in the grid sampling point as the initial contour of the coastline; (3) using the initial contour of the coastline as an input of the geometric active contour model, vectorizing the coastline processed by the geometric active contour model by using area information combining images as a boundary stop condition of the geometric active contour model so as to finally obtain a continuous coastline. The method utilizes the global information of the images, has good expandability, and inhibits the influence of noise on coastline detection so as to accurately extract the coastline.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a SAR image coastline extraction method based on a geometric active contour model. Background technique [0002] Coastline detection plays an important role in tourism, coastal zone environmental protection, coastal zone management and marine engineering, so it is of great significance to accurately and quickly determine the position, direction and contour of the coastline. The traditional coastline detection has great limitations in data acquisition and information processing, mainly in the poor accessibility and accessibility of the coastal environment; the offshore and coastal environments are complex and changeable, and it is difficult to carry out multi-variable synchronous control observations; The coastal environment has a long period of change and a large amount of information, so it is difficult to obtain ideal controllable data, and it is also very difficult to...

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T2207/10044G06T2207/20192G06T2207/30181
Inventor 康艳秋魏雪云
Owner JIANGSU UNIV OF SCI & TECH
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