Patent ID: 6327543
Filing Date: 2001-12-04
Classification: G07D

Abstract:
A method of calculating the width of shift of a waveform representing a characteristic amount of a paper type, comprising:a first step of reading, from a plurality of portions in the direction of conveyance of a paper type to be examined, characteristic amounts of the paper type, to produce an input waveform representing the characteristic amount corresponding to a position in the direction of conveyance of said paper type;a second step of setting a plurality of widths of shift in the direction of conveyance of the input waveform from a reference waveform between a predetermined minimum width of shift and a predetermined maximum width of shift, to produce for each of the set widths of shift a plurality of waveforms for calculating the width of shift which are obtained by shifting the input waveform in the direction of conveyance;a third step of calculating for each of the produced waveforms for calculating the width of shift a value corresponding to the sum of the differences between the waveform for calculating the width of shift and a reference waveform previously produced at a plurality of predetermined positions where an operation is to be executed out of positions in the direction of conveyance; anda fourth step of determining that the width of shift corresponding to the waveform for calculating the width of shift in which the calculated value corresponding to the sum of the differences is the smallest is the width of shift in the direction of conveyance of said input waveform from said reference waveform.