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

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.

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...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome above-mentioned technical defect, has proposed a kind of ship wake background contrast enhancement mode based on top-hat transformation, and has combined Radon transform detection wake, and this method can reduce background gray value while retaining the linear feature of wake, Significantly improve the contrast between the trail and the background, which can solve the problem that the trail is difficult to be detected due to the low contrast between the trail and the background, especially for the trail with thicker lines. The peak point in the Radon transform domain of the image after the contrast is improved will be more obvious and more conducive to tail detection

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