Method and device for reading matrix printing text

Details Method and device for reading matrix printing text Method and device for reading matrix printing text

1983-03-24

1985-10-01

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 67, G06K 918

Patent

active

045450668

ABSTRACT:
A readhead for reading text printed by a matrix printhead comprises an aligned array of side by side photodiodes (4). An optical system forms an image of a strip of the text support on the array. The image and the photodiode array are such that the image of a single printed dot of a character block normally covers an integer number of photodiodes. The array is periodically sequentially scanned to form an output signal which is digitized before being fed to a margin detector which determines margins above and below the character block. Signal blocks are stored after being analyzed by counting margin values and the number of "1" and "0" states. The process of the invention results in a signal which is effectively a reproduction of the signal originally used to print the character blocks.

REFERENCES:
patent: 3432673 (1969-03-01), Mader
patent: 3723969 (1973-03-01), Thaddey
patent: 4263504 (1981-04-01), Thomas
patent: 4268179 (1981-05-01), Long et al.

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