METHOD FOR A BANKNOTE DETECTOR DEVICE, AND A BANKNOTE DETECTOR DEVICE

A banknote detector device for an automatic teller machine, for differentiating between non-accepted and accepted banknotes, includes 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. The image includes image data in the form of a number of pixels; and a reference banknote image (RBI) storage where one reference banknote image, being processed from a predetermined number of banknote images from accepted banknotes, is stored for each face of each banknote. The device includes an alignment, a banknote face classification unit, a printed pattern positioning unit 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 to classify the banknote as accepted or non-accepted.