Ellipse-like curve recognition by calculation of distances of po

Details Ellipse-like curve recognition by calculation of distances of po Ellipse-like curve recognition by calculation of distances of po

1995-07-21

1998-03-31

Johns, Andrew

Image analysis

Pattern recognition

Feature extraction

382286, G06K 946

Patent

active

057347514

ABSTRACT:
After calculation of coordinates of points on a plane curve, a pattern recognition device calculates (S3) coordinates of foci and a major axis of a candidate ellipse and, (S4) until all points are used, (S5) a sum of distances between said point and the foci. After calculation of (S6) of the sum to the major axis, (S7) a variance of such ratios is calculated to judge (S8) whether or not the plane curve is a geometric ellipse. A mean value may be substituted for the variance. The variance may be calculated as regards sums calculated for all points. Preferably, the foci and the major axis are calculated by calculating (S1) an inscribed and subsequently (S2) a circumscribed rectangle. In this event, the candidate ellipse is inscribed in the circumscribed rectangle.

REFERENCES:
patent: 4618989 (1986-10-01), Tsukune et al.
patent: 5186711 (1993-02-01), Weiss et al.
patent: 5363107 (1994-11-01), Gertz et al.
patent: 5469537 (1995-11-01), Seki

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