An algorithm for extracting the center of linear structured light fringe based on directional template

The center line of the line structured light stripe extraction is the key step in the process of laser measurement line structure. In the laser extraction process, a new method based on adaptive orientation template is proposed to extract subpixel of the center of optical stripe for the influence of the quality of light source and the inconsistent width of the image stripe on the object surface. This algorithm firstly determines the optical fringe region and calculates the width of each section of the fringe by contour detection. Then use the skeleton thinning method to obtain the coarse center of gravity of the laser stripes. According to the width of each cross section of the light stripe, generate a direction template of the corresponding size and find the normal vector direction of each point on the skeleton. Finally, the subpixel position of the fringe center is determined by gray gravity center method on the normal vector. The experimental results show that this method can eliminate the influence of non-uniform noise and has a better extraction effect on light fringe with non-uniform width.