A rapid three-dimensional measurement system for facial morphology by laser multi-slits

A laser light-sectioning technique for measuring the three-dimensional shape of the face has been developed. Multi-slit lasers were used to minimize the recording time, and the accumulating technique of multiple images was used to reduce the memory size. The system can scan the entire human face within 6 seconds and develop a three-dimensional image in approximately 4 minutes. The accuracy of this system was found to be within a 0.4% relative error. The method has the advantages of being contact-free, rapid, automatic, and useful for three dimensional clinical assessment.