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Next: 14 Special Effects Up: 13.4 Image Warping Previous: 13.4.1 The Pixel Zoom   Contents

13.4.2 Warps Using Texture Mapping

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 rendered 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.