초록 ▼

In a first embodiment of a material detection system according to the invention, a security document is disposed in an optical path between an infrared light source and image sensor so that the imaging system comprising the infrared light source, image sensor and associated controller determines cha

In a first embodiment of a material detection system according to the invention, a security document is disposed in an optical path between an infrared light source and image sensor so that the imaging system comprising the infrared light source, image sensor and associated controller determines characteristics of material compositions of a document based on transmissivity characteristics of a document. In a second embodiment, a radiation wavelength sensitive additive which emits energy in a second band of wavelengths when radiated in a first band of wavelengths is incorporated in a security document and detected for by an imaging system which detects for emitted radiant energy in the second band of wavelengths. In a third embodiment of a material detection system, the manufacturing of documents of various styles is controlled so that the various styles of documents exhibit similar reflectance characteristics under illumination by a predetermined narrow band source despite exhibiting dissimilar reflectance characteristics under white light.

대표청구항 ▼

1. An apparatus for detecting scratch-off material on a game ticket of the type comprising at least one play area having scratch-off material comprised of light blocking material formed thereon when said game ticket is manufactured, said apparatus comprising:a light source selected so that light ray

1. An apparatus for detecting scratch-off material on a game ticket of the type comprising at least one play area having scratch-off material comprised of light blocking material formed thereon when said game ticket is manufactured, said apparatus comprising:a light source selected so that light rays emanating from said source transmit substantially through all material present in said document except for said light blocking material; an image sensor assembly positioned to generate image signals corresponding to said at least one play area, said image sensor assembly including an image sensor and imaging optic means for imaging said play area onto said image sensor, and a controller in communication with said imaging assembly adapted to capture an image representation of said at least one play area which indicates contrast between areas of said at least one play area covered by said scratch-off material and areas of said play area not covered by said scratch-off material; and means for positioning said ticket in an optical path between said light source and said image sensor.