A method and apparatus for taking impressions of a portion of the body which utilizes the projection of a grid of sinusoidal profile onto the body portion of which the impression is to be taken. The projections are phase-shifted and resulting images are memorized and from the memorized images, the variations...http://www.google.ca/patents/US4952149?utm_source=gb-gplus-sharePatent US4952149 - Process and apparatus for taking a medical cast
