A 3D Shape Measurement System

This paper presents a 3D shape measurement system for stationary objects which features reduced cost, high accuracy, and ease of implementation. An integral part of this system is a 2D multi-plane camera calibration technique, implemented with improvements to the automation and corner extraction over traditional techniques. A binary coded structured light plus phase shifting technique is implemented in which a modified sequence is employed to solve the correspondence problem. The modified sequence is more sensitive to shape changing than traditional sequence. A simulated annealing algorithm is used to find the best sequences. A phase value based correction technique is applied to retrieve relatively reliable codewords. The phase shifting technique is also used to obtain higher resolution results. Final results show that this modified binary code light strategy has higher accuracy than traditional ones.