William C Grimmell, Jim M Adams, Gilbert C Kaetzel, Robert P Fazzini, Edward F DeZabala: Method and apparatus for color recognition and defect detection of objects such as capsules. Hoffmann La Roche, Jon S Saxe, Bernard S Leon, Mark L Hopkins, March 13, 1979: US04143770 (37 worldwide citation)

Method and apparatus for high-speed automatic inspection and processing of large numbers of solid discrete particular objects such as multicolored capsule dose forms in regard to color and/or defect detection, in which virtually all unacceptable material is isolated and an accurate running and total ...