Image analysis – Histogram processing – For setting a threshold
Patent
1989-01-30
1991-01-29
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 43, G06K 900
Patent
active
049892576
ABSTRACT:
A system extracts a set of size invariant, rotation invariant features from pixel data of a character and sends the set of features to a statistical decision tree to effectuate automatic recognition of a character. The set of extracted features includes a group of features that is extracted by dividing a circle bounding the character into eight rings and 24 slices and counting the number of character pixels contained in each ring and in each slice. Various Fourier transforms, autocorrelations, moment calculations, and sorting operations are performed on many of the aforementioned arrays to yield further size and orientation invariant features. The distance between the centroid of the largest hole of the character and the center of the character is computed. The ratios of the perimeters of first and second holes of the character to the outer perimeter are computed.
REFERENCES:
patent: 2838602 (1958-06-01), Sprick
patent: 3112468 (1963-11-01), Kamentsky
patent: 3165718 (1965-01-01), Fleisher
patent: 3925760 (1975-12-01), Mason et al.
patent: 4007440 (1977-02-01), Kono et al.
patent: 4097847 (1978-06-01), Forsen et al.
patent: 4105998 (1978-08-01), Yoshida et al.
patent: 4164728 (1979-08-01), Marsh
"Algorithms for Shape Analysis of Contours and Waveforms", by T. Pavlidis, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-2, No. 4, Jul. 1980, pp. 301-312.
"Description and Discrimination of Planar Shapes Using Shape Matrices", by A. Goshtasby, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-7, No. 6, Nov. 1985, pp. 738-743.
"Fourier Descriptors for Plane Closed Curves", by C. T. Zahn and R. Z. Roskies, IEEE Transactions on Computers, vol. C-21, No. 3, Mar. 1972, pp. 269-281.
"On the Encoding Arbitrary Geometric Configurations", by H. Freeman, IRE Transactions on Electronic Computers, vol. EC-10, Jun. 1961, pp. 260-268.
"Visual Pattern Recognition by Moment Invariants", by M. K. Hu, IRE Transactions on Information Theory, vol. IT-8, Feb. 1962, pp. 179-187.
Boudreau Leo H.
GTX Corporation
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