Computer-implemented method for automatic extraction of data fro

Details Computer-implemented method for automatic extraction of data fro Computer-implemented method for automatic extraction of data fro

1989-02-02

1992-08-18

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 48, 382 9, 382 33, G06K 920

Patent

active

051406500

ABSTRACT:
A machine-implemented method for extracting character data from printed forms of the type having generally straight lines and data regions separated by lines utilizes a processor coupled to an image scanning device and a data storage device. The method includes the steps of scanning a blank form so as to create a digital image of a first array of pixels, identifying the pixels in the array which form generally straight lines of connected line pixels, creating data masks in the array at locations separated by the identified lines, the data masks corresponding to the data regions in the printed form, scanning a filled-in form so as to create a digital image of a second array of pixels, identifying pixels in the second array which form generally straight lines of connected pixels, calculating the offset of the lines in the second array from the lines in the first array, locating the data masks created in the first array into the second array by use of the calculated offset, and extracting data corresponding to character pixels from the data masks in the second array.

REFERENCES:
patent: 4503556 (1985-03-01), Scherl et al.
patent: 4533959 (1985-08-01), Sakuri
patent: 4741045 (1988-04-01), Denning
patent: 4748678 (1988-05-01), Takeda et al.
patent: 4933984 (1990-06-01), Nakano

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