In a volume determination process, a slit pattern is projected obliquely downwardly, or slit patterns are projected obliquely downwardly and upwardly, onto an article which is at rest or in motion. The slit pattern or patterns are in the form of a parallel stripe pattern or a grid pattern. The surface...http://www.google.es/patents/US4767212?utm_source=gb-gplus-sharePatente US4767212 - Volume determination process
