Template matching and optical flow method-based detection of power transmission line foreign matter of unmanned aerial vehicle image

Abstract

The invention discloses a template matching and optical flow method-based detection method for a power transmission line foreign matter of an unmanned aerial vehicle image, and belongs to the technical field of picture processing. The method comprises the steps of power transmission line video image collection, linear edge contrast enhancement, mean filtering, edge straight line feature extraction, power transmission line region setting, template matching, optical flow calculation, optical flow grayscale image binarization, feature point detection tracking and foreign matter identification, and the like. According to a feature that a power transmission line is approximate to a horizontal straight line, the linear edge contrast enhancement method and the edge straight line feature extraction method are proposed, so that an edge straight line of the power transmission line can be accurately extracted, and the adaptability and the edge straight line feature extraction are strong. According to a principle of large moving displacement of corresponding pixel points of an object relatively close to a camera in the image, a foreign matter region determination method is proposed by integrating template matching, optical flow calculation and image binarization, so that the accuracy is high and the robustness is strong. A foreign matter is tracked and identified through feature point matching of the foreign matter, so that the accuracy is high and the adaptability is strong.

Description

technical field [0001] The patent of the present invention relates to the technical field of image processing, and in particular to a method for detecting foreign objects in power transmission lines based on template matching and optical flow method for UAV images. Background technique [0002] In recent years, with the development of the power system, the scope of transmission lines has continued to expand, and transmission line failures caused by foreign objects such as plastic bags and kites hanging on the transmission lines have occurred frequently, which has caused great impact and losses on people's lives and production. Therefore, it is of great significance to monitor the suspension of foreign objects on transmission lines, and to detect and eliminate faults in time. [0003] At present, the method of foreign object detection on high-voltage transmission lines is mainly through manual inspection, but because the transmission line is located in a wide range and the ge...

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Problems solved by technology

At present, there are very few domestic patents on this aspect. The Chinese patent "Transmission Line Foreign Object Detection Method Based on Visual Saliency Analysis" (Application No.: 201610269864.2) proposes to analyze power transmission by judging whether there is anomaly in the defined area of ​​interest through the significance level calculation model The method of foreign matter attached to the line has the advantages of fast detection speed and high efficiency. Although this method improves the robustness of foreign matter judgment to a certain extent, for the complex background and various types of foreign matter, pure visual salience anomaly detection It cannot completely solve the misjudgment caused by the complexity of the environment, so its accuracy and adaptability still need to be improved

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