Ellipsoid detecting method, figure center detecting method,...

Details Ellipsoid detecting method, figure center detecting method,... Ellipsoid detecting method, figure center detecting method,...

2006-08-30

2010-02-23

Tabatabai, Abolfazl (Department: 2624)

Image analysis

Applications

C434S214000

Reexamination Certificate

active

07668337

ABSTRACT:
A method for detecting an ellipsoid includes: extracting an ellipsoid candidate; extracting an ellipsoid contour; calculating an ellipsoid parameter; calculating an adaptability ratio; and eliminating the ellipsoid candidate. Extracting the ellipsoid candidate includes: inputting an image with figures; selecting the ellipsoid candidate from the figures; and extracting a contour candidate point and a center point. Extracting the ellipsoid contour includes: drawing straight lines; determining contour candidate points; calculating first and second distances; and defining ellipsoid contour points. Calculating the ellipsoid parameter is based on the ellipsoid contour points and the center point. Calculating the adaptability ratio includes: drawing a complete ellipsoid; and calculating the adaptability ratio between the complete ellipsoid and the ellipsoid candidate. Eliminating the ellipsoid candidate is performed when the adaptability ratio is equal to or smaller than a threshold.

REFERENCES:
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patent: 7483548 (2009-01-01), Nakano et al.
patent: 2002-183739 (2002-06-01), None
patent: 2002-216138 (2002-08-01), None
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IEICE D-11, vol. J84-D-11 No. 2, pp. 287-298, Feb. 2001, Mori et al., “Elliptic Arc Discrimination Using Conjugate Diameter of Chord” with partial translation.

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