Common to all the filters and point operations described so far is the fact that they may change the intensity function of an image but the position of each pixel, and thus the geometry of the image, remains the same. The purpose of geometric operations, which are discussed in this chapter, is to deform an image by altering its geometry. Typical examples are shifting, rotating, or scaling images, as shown in Fig. 21.1. Geometric operations are frequently needed in practical applications, for example, in virtually any modern graphical computer interface.
KeywordsSource Image Projective Mapping Target Image Projective Transformation Point Pair
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