Image analysis – Histogram processing – For setting a threshold
Patent
1981-01-21
1983-06-14
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
235454, 250566, 3401463MA, 364491, 382 23, 382 33, 382 56, 382 57, G06K 900
Patent
active
043886108
ABSTRACT:
This disclosure concerns to apparatus for reading drawings. The apparatus of this invention is an apparatus for reading symbols on a drawing wherein the drawing comprises a preprinted lattice pattern with orthogonal lines forming unit rectangular areas and each symbol or portions thereof is drawn within one or more of the unit area each symbol is drawn so that the portion of the symbol within a unit area has a predetermined size and position with respect to the sides of the unit area.
The apparatus includes scanning means for scanning several discrete points within each unit area and producing binary data for each scanned point, storage means for storing standard pattern data, identifying means, coupled to the storage means and the scanning means, for comparing the binary data with the pattern data to identify the symbol or symbol portion within the scanned unit area, the identifying means producing a code representing the symbol or symbol portion when identity is established, detecting means for detecting the position of the scanned unit area, and drawing storage means, coupled to the detecting means and the identifying means, for storing the code at an address defined by the detecting means, the drawing storage means storing a code for each unit area scanned by the scanning means.
REFERENCES:
patent: 3636513 (1972-01-01), Tisdale
patent: 3692237 (1972-09-01), Fiderer
patent: 3693168 (1972-09-01), Halkyard et al.
patent: 3705956 (1972-12-01), Dertouzos
patent: 3895358 (1975-07-01), Pearl
patent: 3924244 (1975-12-01), Seitz
patent: 3930237 (1975-12-01), Villers
patent: 4014000 (1977-03-01), Uno et al.
patent: 4272756 (1981-06-01), Kakumoto et al.
Shapiro, "Inexact Matching of Line Drawings in a Syntactic Pattern Rec. System," Pattern Recognition, vol. 10, No. 5/6, 1978, pp. 313-321.
Clement, "The Extraction of Line-Structured Data from Eng. Drawings," Pattern Recognition, vol. 14, Nos. 1-6, 1981, pp. 43-52.
Boudreau Leo H.
Tokyo Shibaura Denki Kabushiki Kaisha
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