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This paper presents an algebraic technique for detecting the symmetry axes of a perspectively projected plane curve. The procedure applies to implicit polynomials which has been fitted to 2D image data acquired by means of a photo camera or a TV set. The effectiveness of the proposed method has been demonstrated experimentally by using both synthetic and real images.
Symmetry axis, perspective projection, invariants, implicit polynomial representation.

G. Marola, "A Technique for Finding the Symmetry Axes of Implicit Polynomial Curves under Perspective Projection," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 27, no. , pp. 465-470, 2005.
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