Abstract
To meet the demand of high precision and high speed of modern industrial inspection, this paper realizes defect detecting in the inner hole of valve. This paper builds a detection system using CCD camera and hard tube endoscope. Through the operation of the test bench can complete to collect image information. Collecting image distortion due to the bending of the bore itself and distortion of the camera lens, so it is necessary to eliminate distortion, image cutting, filtering and other operations before image matching, then, stitching image with Scale Invariant Feature Transformation algorithm (SIFT). The weighted average method is used to deal with the overlapped area of the image in the image stitching, continuously, a completed hole image of valve sleeve is obtained. Finally, use algorithm of template match between template and detection image to complete defect detection.
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