Nondestructive testing of transmission lines based on the image method

The main research is image processing methods, it obtained the images of transmission lines with the CCD under the natural environment. In order to avoid complicated lighting conditions for the influence of edge extraction, processing the image by the homomorphic filter , which can receive better pretreatment images. In order to get clear cable edge, this paper adopts self-adaptive threshold value method, achieves transmission edge extraction with Matlab, and analyzes and compares the processing results of the corresponding image , finally, this method can obtain the best image edge extraction.