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6.18 Image Warping and Dewarping

Image warping or dewarping may be implemented using texture mapping by defining a correspondence between a uniform polygonal mesh and a warped mesh. The points of the warped mesh are assigned the corresponding texture coordinates of the uniform mesh and the mesh is texture mapped with the original image. Using this technique, simple transformations such as zoom, rotation or shearing can be efficiently implemented. The technique also easily extends to much higher order warps such as those needed to correct distortion in satellite imagery.