Validation of security markings on a document uses a laser to generate an image captured by camera for processing

摘要

The output of a laser (1) is directed (6) onto a triangular bar reflector (3) and then onto the grating structure of a security pattern (4) on a document. The pattern image is reflected onto (11-13) the surface of a matt plate (2) and a matrix camera on the underside captures the image and an identification is performed.