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We present a camera calibration method based on vanishing point, that is, the vanishing points of two groups of parallel lines on the target plane are used to achieve camera calibration. A series of known positions points on target plane are used as the feature points, and the target images are recorded, the image coordinates of feature points are used to calculate the coordinates of vanishing point, then the matrix between feature points and camera is used to obtain internal parameters of camera. Experimental results show that the proposed calibration algorithm is correct, simple and convenient.

The image segmentation algorithm based on facet model fitting is proposed, we firstly employ the facet model to fit the image intensity, and then calculate the fitting error. After acquiring seed segmentation region from the fitting error distribution, the region growing algorithm is implemented to enlarge the seed region to some region boundary. Finally, a new region merging algorithm is implemented to merge adjacent regipons into some large regions. Experiment results intestify the correctness of our proposed segmentation algorithm

We present a new method to define the reliability of pixel and path of phase unwrapping. The reliability function is calculated based on modulation, second difference of wrapped phase, and second differnce of modulation, and then we present the concept of smoothness of path, the reliability of path is calculated based on reliability of pixel and smoothness of path. Experiment results validate the correctness of our proposed algorithm.

We present an algorithm based on variable-step-iterative (VSI) to search line-surface intersection point, which is very important process for simulation of fringe projection system. Our VSI algorithm can avoid the difficult process such as finding iterative start point and selecting parameters to obtain a correct result. Simulation result validates the reconstructed RMS errors obtained by our VSI simulation algorithm are far smaller than those obtained by previous reported simulation method.