Automatic meshing of Shack-Hartmann image based on image correlation

In the process of Shack-Hartmann wave-front measure, meshing of Shack-Hartmann image is widely used for calculating wave-front slope. The conventional meshing method, which manually adjusts the mesh by observing the Shack-Hartmann image, is time-consuming. It is difficult to achieve real-time wave-front measure. In order to realize auto-meshing, in this paper, auto-meshing method based on image correlation is presented. In this algorithm, auto-correlation of Shack-Hartmann image is used for calculating grid interval and grid number. Then, simulative light-spot image according with the grid is obtained. At last, correlation operation between the simulative light-spot image and the Shack-Hartmann image is done to acquire optimal coordinate of the grid. This algorithm which is efficient and has no need for human intervention can achieve real-time auto-meshing.