Image analysis – Histogram processing – For setting a threshold
Patent
1981-12-23
1984-08-28
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 34, 382 48, G06K 980
Patent
active
044688091
ABSTRACT:
A multiple font optical character recognition reader system for capturing character patterns by pixel, quantizing and sequencing the data representing multiple pixels, enhancing the character patterns represented by the data, locating characters within the enhanced data, and recognizing the characters. Data representing individual pixels is quantized into white, gray and black levels. During enhancement, gray pixel data is selectively changed to black or white while some black is changed to white, both operations depending on the white, gray or black levels in adjacent pixels. The enhanced data is scanned for a multiplicity of simultaneous conditions which define when a matrix of the data includes a character pattern which is optimally positioned within the matrix. The data matrix containing the character pattern is then sequentially compared to sets of data individually representing templates of potential characters. When optimal matching and threshold conditions are satisfied, a character is classified as recognized.
REFERENCES:
patent: 3104372 (1963-09-01), Rabinow et al.
patent: 3234513 (1966-02-01), Brust
patent: 3644890 (1972-02-01), Matthews
patent: 3676847 (1972-07-01), Partin
patent: 3688266 (1972-08-01), Watanabe et al.
patent: 3717848 (1973-02-01), Irvin et al.
patent: 3737855 (1973-06-01), Cutaia
patent: 3973239 (1976-08-01), Kakumoto et al.
patent: 3992697 (1976-11-01), Knab et al.
patent: 4185271 (1980-01-01), Izawa et al.
patent: 4298859 (1981-11-01), Romanski
Yamada et al., "Recognition of Index Numerals in a Traffic Register Meter", Review of the Electrical Communication's Laboratories, vol. 23, Nos. 11-12, Tokyo, Japan, pp. 1215-1223, Nov.-Dec. 1975.
Hall et al., "Analog Thresholding Scheme for Medium Resolution Scanners", IBM Tech. Discl. Bul., vol. 14, No. 6, Nov. 1971.
Intern. Pub. No. WO81/00319, Intern. Application No. PCT/US80/00750, Inventors Todd et al., Published Feb. 5, 1981.
Grabowski John S.
Tong Aaron C. Y.
Boudreau Leo H.
Cavender J. T.
NCR Corporation
Salys Casimer K.
LandOfFree
Multiple font OCR reader does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiple font OCR reader, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple font OCR reader will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-881713