Fast Multi-Line Structured Light Measurement Method Integrated with Region Matching

According to the contradiction between measurement efficiency and accuracy in the multi-line structured light measurement, a fast measurement results of the measurement method base on region digital image correlation matching is proposed in this paper. The bilateral filter and Otsu thresh method are used to preprocess the image, and the gray centroid method is utilized to extract the initial point of the stripe center. The bicubic interpolation method is adopted to improve the local neighborhood resolution of the center initial point for the reuse of the gray centroid method in the local neighborhood to improves the accuracy of the center point extraction. Based on the center line extracted from the left image, the digital image correlation method is used to search for stereo matching points corresponding to the reference near the center line of the right image, which greatly reduced the search range of the digital image correlation method and improved measurement efficiency and stereo matching accuracy. The measurement experimental result of the standard block gauge show that the centerline extraction speed of the method is 3. 29 times that of the Steger method, and compared with the traditional epipolar constrained stereo matching method, the root mean square error of this method is reduced by 68. 57%.