Ship wake detection method based on top hat transformation and Radon transformation

A technology of top-hat transformation and detection method, which is applied in the field of image processing, can solve the problems that trails are difficult to be detected, and achieve the effect of facilitating automatic detection, improving contrast, and improving detection performance

CN110852992AActive Publication Date: 2020-02-28NAT SPACE SCI CENT CAS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-02-28

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Abstract

The invention discloses a ship wake detection method based on top hat transformation and Radon transformation, and the method comprises the steps: obtaining an original image, processing the originalimage based on the top hat transformation, and obtaining an image with improved contrast; and performing Radon transformation on the image with the improved contrast, extracting a peak point, obtaining wake position information, and marking a wake in the image. The method provided by the invention has a contrast improvement effect on both the bright wake and the dark wake, and the dark line feature of the dark wake can be converted into the bright line feature; radon transformation is carried out on the image with the improved contrast ratio, and a peak point in a Radon transformation domain is highlighted, so that the detection performance of the ship wake is improved; the method can be applied to ship wake detection in Tiangong-2 interferometric three-dimensional imaging microwave altimeter images.
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Description

technical field

[0001] The invention relates to the field of image processing, in particular to a ship wake detection method based on top hat transformation and Radon transformation. Background technique

[0002] Tiangong-2 interferometric imaging radaraltimeter (InIRA) is the first microwave altimeter in the world that can simultaneously measure sea surface height with wide swath and perform 3D imaging and 2D imaging, which is different from ordinary synthetic aperture radar ( Aperture Radar, SAR) is characterized by a large incident angle, whose incident angle ranges from 1° to 8° (Reference [1]: Y. Zhang et al., “Demonstration of ocean target detection by Tiangong-2 interferometric imaging radaraltimeter,” MIKON 2018-22nd Int.Microw.Radar Conf., no. 2, pp. 261–264, 2018.). In the InIRA image, a large number of ship wakes can be observed, and the detection of ship wakes can locate the ship's position, obtain the heading, and estimate the speed, which plays an important ro...

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Embodiment Construction

[0063] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0064] like figure 1 As shown, the present invention proposes a kind of ship wake detection method based on top-hat transform and Radon transform, comprises the following steps:

[0065] Step 1) Obtain the original image, and perform median filtering on the original image: from the (4,4)th pixel of the image that has undergone median filtering as the operation object point;

[0066] Step 2) Take the 7×7 neighborhood of the operation object point as the neighborhood window, divide the neighborhood window into nine 3×3 overlapping windows, calculate the average value of the nine overlapping windows respectively, and form them according to the corresponding positions 3×3 mean matrix;

[0067] Step 3) correlate the four edge detection operators with the average value matrix respectively to obtain four values;

[0068] Step 4) According to the...