Image analysis – Histogram processing – For setting a threshold
Patent
1988-01-19
1991-06-25
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
382 13, G06K 920
Patent
active
050274147
ABSTRACT:
The forgery of signatures is made more difficult if the dynamic features of a signature can be checked when the signature is verified. Signatures to be verified are written with a pen which is sensitive to light received at its tip, each signature being written on an area having shading in intensity or color which varies with position. As the pen is moved a signal which depends on the light received by the pen varies in a way which is characteristic of the dynamic features of the signature. Verification is by comparing the time variation of the said signal with a previous authentic version as well as by comparing signatures. Comparison may be carried out automatically or by an operator who views a display of the authentic signal. The invention may also be used for data capture when characters are written on paper which has areas of different intensity or color of shading.
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IBM Technical Disclosure Bulletin, vol. 27, No. 11, Apr. 1985, pp. 6537-6539, New York, U.S.A.: "Electro-Optical Cursor Controller".
Jung Yon
Moore David K.
National Research Development Corporation
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