Image ship detection method based on constant false alarm rate

A technology for constant false alarm rate and ship detection, which is applied in measurement devices, radio wave measurement systems, and radio wave reflection/re-radiation. It can solve difficult marine environment and safety monitoring and analysis, and cannot extract ENVISATASAR image ship targets And other issues

Inactive Publication Date: 2011-09-28
NANJING UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of image ship detection method based on constant false alarm rate, generate vector point ship target, solve existing open radar image ship detection method and can not extract ENVISAT ASAR image ship target, and ship The ship detection result is a ship target-background binary image, which is difficult to be directly applied to the analysis of marine environment and safety monitoring

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  • Image ship detection method based on constant false alarm rate
  • Image ship detection method based on constant false alarm rate
  • Image ship detection method based on constant false alarm rate

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Embodiment 1

[0033] Step 1: ENVISAT ASAR image acquisition and data format conversion. The ENVISAT ASAR WSM (WideSwath Mode) wide imaging mode image named ASA_WSM_1PNCUH20060601_022221_000000422048_00132_22230_0151.N1 was acquired by the Satellite Remote Sensing Ground Receiving Station of the Chinese University of Hong Kong on June 1, 2006. It was read by the ENVI_ENVISAT_GEOREF_ENVISAT method provided by ENVI IDL software ＊ .N1 format image data, perform geometric correction on image data, and convert it to JPG image file format. Use the Subset image cropping function of ERDAS IMAGE software to crop the image of the study area with a size of 1654 rows and 1181 columns (attached figure 1 );

[0034] Step 2: Read ENVISAT ASAR image data. Use the GDAL.Open method of GDAL / OGR to open the Dataset of the image JPG format dataset in the study area, and use the Read method of Dataset to read the grayscale data of the image data row by row to the one-dimensional array W. The length of the array...

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Abstract

The invention discloses an image ship detection method based on constant false alarm rate, belonging to the technical field of radar remote sensing image target detection. The method comprises the following steps of: reading ENVISATASAR image data and converting the format of the ENVISATASAR image data; setting the following detection widows, namely a target window, a protection window and a background window; sliding the detection windows on an image data array; calculating a widow mean value and a standard deviation; setting a false alarm rate detection control coefficient; generating a ship target-background binary image according to a ship target detection criteria; and traversing the ship background-target binary image to generating a vector point-like ship target. According to the invention, the problem of setting sliding windows and the false alarm rate detection control coefficient can be solved during ENVISATASAR remote sensing image ship detection, and the method of generating a vector point-like ship target is provided. By the adoption of the method disclosed by the invention, the vector point-like ship target can be extracted from an ENVISATASAR image to serve the marine environment and safety monitoring analysis.

Description

technical field [0001] The invention relates to a radar image ship detection method, in particular to a remote sensing image ship detection method based on constant false alarm rate. Background technique [0002] Ship target detection can be used for the monitoring and management of water transportation in specific sea areas, rescue of ships in distress, illegal fishing, illegal smuggling, illegal dumping of oil pollution by ships, etc. It is an important content of marine environment and safety monitoring. With the wide application of remote sensing technology in ocean observation, it has become possible to detect ships and ships at sea through remote sensing images. Continuous, dynamic ocean observation. Synthetic Aperture Radar (SAR) has the advantages of wide observation range, short observation period, strong data timeliness, high spatial resolution, all-weather and all-weather, so it has been widely used in oceans including ships in recent years. Target detection re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/90
Inventor 陈振杰李满春刘永学程亮杨康陈东刘成明蔡文婷张昱
Owner NANJING UNIV
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