Method for measuring thickness of cable protecting bush accurately

Abstract

The invention discloses a method for measuring thickness of a cable protecting bush accurately, and solves the defects that the accuracy is low, the error is large, and the efficiency is low by using a traditional geometrical measurement. The method includes the steps that firstly, preprocessing is conducted on a collected slice image of the cable protecting bush, edge pixel coordinates are obtained by using an Sobel edge detection method and a contour tracing technology, detection and distinguishing are conducted on angular points based on gradient correlation matrixes, as for the angle points, sub pixel position is conducted by using a support line fitting method based on angle point neighborhood supporting points, as for non-angle points, accurate positioning of the non-angle points is completed by using an edge re-positioning algorithm based on ZOM sub pixels. By means of the method, the measuring accuracy of the cable protecting bush is further improved, and the method is easy to carry out.

Description

technical field [0001] The invention relates to a method for finely measuring the thickness of a cable sheath, in particular to finely measuring the thickness of a cable sheath based on signal processing technology. Background technique [0002] In recent years, with the rapid development of China's economy, the annual demand for cables has increased dramatically. With the development of domestic urbanization and heavy industrialization in the next few years, the demand for cables in communication networks, power grid construction, transportation and other fields is still in a rapid growth trend, which will inevitably put forward higher requirements for cable quality inspection of cable manufacturers . The detection accuracy and detection speed of traditional mechanical measurement methods can no longer meet the needs of the market. This kind of measurement method can only measure the thickness between the selected two points at a time, which not only has a large workload ...

AI Technical Summary

Problems solved by technology

At present, the image measurement technology has been used in many fields, but it is rarely used in the measurement of the thickness of the cable sheath. This is because the cable sheath has its own particularity, and the existing image measurement technology must be carried out according to its specific characteristics. Improve

In the patent ZL 2009100354236, we proposed a method for measuring the thickness of the cable sheath based on image processing. First, the collected image is smoothed and preprocessed, and then Sobel edge detection is performed to extract the edge of the single-pixel image and use polynomial interpolation. The method for sub-pixel positioning, and finally get the output result of the thickness, but this method does not effectively classify the points extracted from the edge, and the accuracy of the positioning algorithm is not high, which affects the accuracy and fineness of the final result

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