Pipeline defect identification and information extraction method

The invention discloses a pipeline defect identification and information extraction method, which comprises the following steps of: shooting an image of a pipeline, and solving a gradient along the direction of the pipeline; performing edge extraction on the pipeline in the image, accumulating edge straight lines in any image under the same camera, obtaining the edge contour of the pipeline, and extracting the position of the pipeline by using a canny edge detection algorithm; extracting a rain line area in any image by adopting a template matching algorithm; respectively solving gradients in the transverse direction and the bus direction of the pipeline by adopting a sobel algorithm, and carrying out binarization processing on an image subjected to edge detection so as to extract the contour of the pipeline; removing the rain line area in the pipeline area; filling a gap defect area in the pipeline area to obtain a closed contour; and performing convex hull detection on the closed contour by adopting a Graha