Method for extracting rusty area on fitting surface

Abstract

The invention discloses a method for extracting rusty area on a fitting surface and belongs to the technical field of electric power automatic detection. The invention aims to provide a method for extracting a rusted area on the surface of a hardware fitting, and solves the problems of poor universality of infrared or ultraviolet detection, easiness in background interference and serious visible light imaging overexposure phenomenon in the prior art, and difficulty in positioning the rusted area. The method comprises the steps of in the process of aerial photography of a hardware fitting surface image by an unmanned aerial vehicle, obtaining polarization images of different polarization angles in cooperation with a linear polaroid, and then obtaining a polarization degree map; constructinga saliency map for the polarization degree map, performing saliency feature filtering, and further enhancing a rusted region in the polarization degree map; and carrying out binarization extraction on the processed image, setting an area threshold value and a length-width ratio threshold value, and extracting a rusted region. According to the method, the problem of non-uniform overexposure of hardware surface imaging under natural light is avoided, the reliability and the detection efficiency of rust area extraction are effectively improved, and technical support is provided for later accurate analysis of the characteristics of the rust area.

Description

technical field [0001] The invention belongs to the technical field of electric power automatic detection, and in particular relates to a method for extracting a rusted area on the surface of a metal tool. Background technique [0002] my country's transmission lines are widely distributed, and the meteorological and geological conditions are complex. The hardware components in the transmission lines are easily corroded by harsh environments, which will cause serious corrosion to the surface of the metal hardware. Especially in areas with high salinity and industrial pollution, damage to the surface of metal fittings greatly affects the safe operation of transmission lines. If the corrosion is not suppressed in time, the safe service life of the metal fittings will not reach its expected design life, causing potential safety hazards in power transmission, and in severe cases, causing transmission line accidents and economic losses. [0003] At present, the main means of det...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a method for extracting the rusted area on the surface of the metalware, which solves the problems in the prior art that the infrared or ultraviolet detection has poor versatility, is easily subject to background interference, and the phenomenon of visible light imaging is seriously overexposed, making it difficult to locate the rusted area.

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