Method for detecting ink jet or dot matrix printing

Details Method for detecting ink jet or dot matrix printing Method for detecting ink jet or dot matrix printing

1991-09-23

1996-09-03

Couso, Jose L.

Image analysis

Pattern recognition

Feature extraction

382292, G06K 946

Patent

active

055531628

ABSTRACT:
The text to be classified as a dot matrix or ink jet printer character is scanned at a suitable resolution. Several horizontal and vertical slices are made through the bitmap image of individual characters. Density values of pixels contained in these slices are stored as a density profile for each slice. As a result of these density profiles, a determination is made as to whether or not the character was printed on a dot matrix or ink jet printer, or whether the characters were printed using a higher quality device such as a daisy wheel printer.

REFERENCES:
patent: 4411015 (1983-10-01), Scherl et al.
patent: 4516262 (1985-05-01), Sakurai
patent: 4547811 (1985-10-01), Ochi et al.
patent: 4741046 (1988-04-01), Matsunawa et al.
patent: 4879753 (1989-11-01), El-Sherbini
patent: 4929979 (1990-05-01), Kimoto et al.
patent: 4932065 (1990-06-01), Feldgajer
patent: 5144566 (1982-09-01), Anderson et al.

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