Image analysis – Histogram processing – For setting a threshold
Patent
1987-06-05
1989-09-05
Buczinski, Stephen C.
Image analysis
Histogram processing
For setting a threshold
382 22, 382 54, G06K 918, G06K 948, G06K 940
Patent
active
H00006815
ABSTRACT:
A dot matrix print detector (24) for use in an optical character recognition system for detecting the presence of characters on a document printed in a dot matrix print format is provided. A scanning device (26) generates pixel signals representing pixel values of portions of characters in a predetermined area appearing on the document. A filter (28) functions to generate filtered signals representing energy levels of pixels associated with the edges of the characters. Summation circuitry (30, 32) is provided for determining the energy levels of the filtered signals for the predetermined area and for generating a summation signal. Summation circuitry (38, 40) generates a summation signal representing the energy levels of unfiltered pixel elements or low pass filtered pixel elements. The output of the summation circuitry (40, 32) is applied to a decision circuit (34) for determining the presence of dot matrix print in the predetermined area.
REFERENCES:
patent: 3634822 (1972-01-01), Chow
patent: 3737855 (1973-06-01), Cutaia
patent: 4263504 (1981-04-01), Thomas
patent: 4274079 (1981-06-01), Todd et al.
patent: 4339208 (1982-07-01), Biedermann
patent: 4484068 (1984-11-01), Mazumder
patent: 4559644 (1985-12-01), Kataoka et al.
patent: 4561022 (1985-12-01), Bayer
patent: 4691366 (1987-09-01), Fenster et al.
Buczinski Stephen C.
Wallace Linda J.
LandOfFree
Dot matrix print detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dot matrix print detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dot matrix print detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-232746