Method for a banknote detector device, and a banknote detector device

• Main Authors: LUNDBLAD, LEIF J.I, VEDIN, LENNART, BJOERKMAN, CLAES
• Format: Patent
• Language: English; French; German
• Published: 03.11.2010
• Subjects: CHECKING-DEVICES; HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING; PHYSICS

Banknote detector device for an automatic teller machine, to be used to differentiate non-accepted banknotes from accepted banknotes, the device comprises a banknote image sensor to receive and scan at least one face of an input banknote and to store a banknote image (BI) of each scanned face in a storage in dependence of said scanning. The banknote image comprises image data in the form of a number of pixels; and a reference banknote image (RBI) storage where one reference banknote image (RBI), being processed from a predetermined number of banknote images from accepted street-quality banknotes, is stored for each face of each relevant banknote. The device comprises an alignment unit to align the banknote image in relation to the RBI, and that the banknote size is determined, a banknote face classification unit to determine face and orientation of the banknote image, a printed pattern positioning unit where the printed pattern of the banknote image (BI) is determined in order to exactly position the BI printed pattern in relation to the printed pattern of a reference banknote image (RBI), and a comparison unit where, for at least one face of the banknote, the BI and RBI, being in exact pattern position in relation to each other, are compared pixel per pixel according to a predefined comparison procedure resulting in that the input banknote is classified as accepted or non-accepted.