Local Hough transform and morphological optimization SAR (synthetic aperture radar) image power line detection method

Abstract

The invention belongs to the technical field of SAR (synthetic aperture radar) image power line detection and particularly relates to a local Hough transform and morphological optimization SAR image power line detection method. The method specifically includes: subjecting an SAR original image to edge detection by adopting an Edison operator to obtain a binary image including edge information; dividing multiple edge belts in the binary image including the edge information; subjecting each edge belt in the binary image with the edge belt divided to straight line detection by adopting a polar-coordinate transformation space based Hough transform method to obtain a Hough transform detection result; in each edge belt of the Hough transform detection result, selecting a line segment with the longest length, if the closest range between an optional rest line segment and the line segment with the longest length is smaller than a preset range threshold and an included angle between the corresponding line section and the line section with the longest length is smaller than a preset included angle threshold, deleting the corresponding line section, and if not, retaining the corresponding line section; finally obtaining an SAR image power line detection result.

Description

technical field [0001] The invention belongs to the technical field of SAR image power line detection, in particular to a SAR image power line detection method based on local Hough transform and morphological optimization. Background technique [0002] The power line is one of the important threat elements in the low-altitude flight environment, which seriously threatens the flight safety of the aircraft. Therefore, how to use microwave radar to quickly detect dangerous power line targets and ensure the safety of the aircraft's low-altitude flight is a very important scientific issue. [0003] Synthetic Aperture Radar (SAR) is an all-weather, all-time, and long-range high-resolution microwave remote sensing imaging radar. , has important practical significance and broad application prospects for the detection of low-altitude environmental threat elements. However, the power line target is small and the reflection intensity is weak. Only when the radar line of sight is perpe...

AI Technical Summary

Problems solved by technology

However, the power line target is small and the reflection intensity is weak. Only when the radar line of sight is perpendicular to the power line or deviates from the left and right by two small deflection angles will Bragg resonance (Bragger) effect appear, and the power line target is easy to collide with roads, field ridges and other places. The object line segments are mixed, resulting in misjudgment of power line detection in SAR images and high false alarm rate

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