Chapters 3 and 4 dealt with the geometry and representation of curves and classes of curves — the shape-spaces. Now it is time to look at some image data to see how shapes can be approximated by members of those classes. The norm and inner product machinery developed earlier proves useful together with the image-processing techniques of chapter 5. Curve approximation techniques are built up step by step in this chapter until the necessary tools are assembled for basic B-spline snakes and deformable templates.
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