Page identification by detection of optical characteristics

Details Page identification by detection of optical characteristics Page identification by detection of optical characteristics

1997-08-29

1999-05-04

Evans, F. L.

Optics: measuring and testing

By shade or color

Trichromatic examination

356407, 356425, 250226, G01J 351

Patent

active

059009438

ABSTRACT:
This disclosure relates to a page identification system for multiple page processing systems which operates by measuring color. Detected color is compared to a look-up table that stores color characteristics for at least one known page. If a match is detected, within a tolerance selected in response to expected measurement variance, then the system produces a page identification code used in page processing. Preferably, the system is embodied in a clipboard device that automatically associates electronic data with a corresponding one of multiple pages. A stylus can be used to write on each page, and each time the stylus is used, the system automatically optically scans the page, produces a page identification code, and associates electronic data with the current page. If no match is detected in the lookup table, then the system enters a learn mode corresponding to presumed detection of a new page. Background light variations are compensated for, in part, by intensity modulating a light source at different frequencies for each of red, green and blue components, and by normalizing the detected components to adjust for total detected light. The system is expected to have utility in a wide range of paper processing systems.

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