Automatic detection of elliptical shapes
Patent 5189711 Issued on February 23, 1993. Estimated Expiration Date: 
September 9, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 9, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3069654 Method and system for detecting elliptical objects Pattern recognition system Patent #: 4769850 InventorsApplicationNo. 800472 filed on 09/09/1991US Classes:382/203, Shape and form analysis382/141, Manufacturing or product inspection382/171, For segmenting an image382/296To rotate an imageExaminersPrimary: Moore, David K.Assistant: Stellrecht, Barry International ClassG06K 009/46AbstractA method is described for automatic detection of a large class of industrial parts, whch is faster and more reliable than current methods. Many industrial parts have visible outlines which are either circular or elliptical or contain segments of these. Circles are seen as ellipses unless viewed head-on. Thus the ability to detect ellipses in an image of an industrial part, quickly and reliably, can be of great help in identification of this part by a robotic assembly process. In our method one first scans the image electronically by a video camera. When a scan line goes through an image of some object one can detect the edges of this image by detecting changes in the light intensity at these edges. For an object of the shape of a conic section (e.g. an ellipse), generally two edges will appear on each scan line and the midpoints between them will all lie on one straight line. This straight line can be detected with Hough's method.Other References
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