| 摘要 |
An embodiment of the invention may include an apparatus. The apparatus may include a channel configured to accommodate a note, a photodetector array preferably arranged substantially perpendicular to a direction of travel of the note through the channel, a transporter configured to transport the note through the channel, at least one illuminator configured to illuminate a width of the channel, and a lens associated with the photodetector array. The lens and the at least one illuminator may be arranged to provide optical data collected from the width of the channel to the photodetector array. The photodetector array may include a plurality of photodetectors.
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