Multi-level optical mark reading that uses an unambiguous...

Image analysis – Applications – Reading maps – graphs – drawings – or schematics

Reexamination Certificate

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Details

C382S195000, C382S200000, C382S203000, C434S353000, C434S356000, C434S358000, C434S362000, C235S454000

Reexamination Certificate

active

07555145

ABSTRACT:
One or more response bubbles are used on a scannable form to be read by a scanning system. An unambiguous symbology of marks is defined to fill into each response bubble, thereby allowing at least one of a plurality of different non-empty intended responses having different output values to be entered into each response bubble. One or more response bubbles are provided on the scannable form to be filled in according to the defined symbology of unambiguous marks. A filled in form is scanned with the scanning system and an image of the scanned form is processed by identifying pixels associated with each response bubble, interpreting the pixels associated with each response bubble to define a raw score according to the defined unambiguous symbology of marks used to mark each response bubble, translating the raw score for each response bubble into one of the plurality of different intended non-empty responses, and outputting the value of the non-empty response for each response bubble. Different output values have different meanings.

REFERENCES:
patent: 3858180 (1974-12-01), Spanjersberg
patent: 4937439 (1990-06-01), Wanninger et al.
patent: 4989258 (1991-01-01), Takahashi et al.
patent: 5102341 (1992-04-01), Koslin
patent: 5134669 (1992-07-01), Keogh et al.
patent: 5184003 (1993-02-01), McMillin et al.
patent: 5235655 (1993-08-01), Hikawa
patent: 5452379 (1995-09-01), Poor
patent: 5711673 (1998-01-01), Grundy, Jr.
patent: 6854644 (2005-02-01), Bolton et al.
patent: WO03010704 (2003-02-01), None

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