Patent ID: 8144313
Filing Date: 2012-03-27
Classification: G07D

Abstract:
1. A paper sheet recognizing method for recognizing paper sheets having different sizes and colors for each type, the method comprising: detecting a light quantity of reflected light or transmitted light obtained by irradiating a paper sheet being transported with a plurality of lights having different source wavelengths by using a line sensor; detecting size of the paper sheet by using an optical sensor; storing reference size data and reference light quantity data generated beforehand for each type of paper sheets to be recognition candidates; selecting a recognition target type from the recognition candidates based on detected size data of the paper sheet detected by the optical sensor and the reference size data; and determining a type of the paper sheet by comparing detected light quantity data of the paper sheet detected by the line sensor with the reference light quantity data of the recognition target type and wherein, in the detecting of the light quantity, the paper sheet is scanned planarly by repeating line detection for a plurality of times with respect to the paper sheet being transported by using the line sensor arranged along a direction orthogonal to a transport direction, in the selecting, a width of the paper sheet in the direction orthogonal to the transport direction, which is the detected size data obtained by the line sensor, is compared with a threshold generated beforehand for each type of the paper sheets to be the recognition candidates, to count the number of the line detections in which the width is included in the threshold, and one recognition target type is selected from the recognition candidates based on a counting result, and in the determining, the type of the paper sheet is specified by comparing the detected light quantity data of the paper sheet with the reference light quantity data of the recognition target type and the reference light quantity data of at least one recognition candidate whose order of size is adjacent to the recognition target type.