Method and apparatus for the determination of the contour of...

Details Method and apparatus for the determination of the contour of... Method and apparatus for the determination of the contour of...

2005-07-12

2005-07-12

Ahmed, Samir (Department: 2623)

Image analysis

Applications

Manufacturing or product inspection

C356S240100

Reexamination Certificate

active

06917700

ABSTRACT:
A certain percentage of sheet metal blanks (20) for cars are not bounded by straight cuts. These so-called contour blanks are cut by form dies to optimize material usage of sheet metal coils. During the tryout process of the press tools the final contour for the blanks is determined in an iterative process. The manually size-optimized blank contour has to be digitized for blank nesting and the construction of a form die to cut the blank from the coil in production. The present invention discloses a low-cost measurement system based on a digital camera (21). This camera allows taking pictures of blanks (20) on-site in the plant and process them off-line to regenerate geometrical information by use of photogrammetric principles. This method yields a significant reduction of lead-time by eliminating the need for a slow coordinate measuring machine (CMM).

REFERENCES:
patent: 4729423 (1988-03-01), Martin
patent: 5642293 (1997-06-01), Manthey et al.
“A Data Reduction Algorithm for Planar Curves” by James Roberge Computer Vision, Graphics, and Image Processing 29, 168-195 (1985).
“Multi-Scale Curvatures for Contour Feature Extraction” by Koichiro Deguchi, IEEE Computer Society Order No. 878.
“Efficient Polygon Approximation of Planar Curves” by M.A.Wani and B.G.Batchelor, SPIE vol. 1823 (1992) pp. 140-150.
“Curvilinear Feature Detection from Curvature Estimation” by Lawrence O=Gorman, IEEE 1988.
“Setmentierung von Konturen auf der Basis von Krummungsberechnungen” by Monika Lange.

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