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<p><b>Abstract</b>—We consider the problem of wrapping around an object, of which two views are available, a reference surface and recovering the resulting parametric flow using direct computations (via spatio-temporal derivatives). The well known examples are affine flow models and eight-parameter flow models—both describing a flow field of a planar reference surface. We extend those classic flow models to deal with a Quadric reference surface and work out the explicit parametric form of the flow field. As a result we derive a simple warping algorithm that maps between two views and leaves a residual flow proportional to the 3D deviation of the surface from a virtual quadric surface. The applications include image morphing, model building, image stabilization, and disparate view correspondence.</p>
Direct estimation, quadratic reconstruction, multiview geometry.

A. Shashua and Y. Wexler, "Q-Warping: Direct Computation of Quadratic Reference Surfaces," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 23, no. , pp. 920-925, 2001.
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