Method and apparatus for capturing information in drawing or writing.

摘要

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 10 which is sensitive to light received at its tip, each signature being written on an area 13 having shading in intensity or colour 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 colour of shading.