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geometry.slides.printing

geometry.slides.printing - CS 450 Introduction to Digital...

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Unformatted text preview: CS 450: Introduction to Digital Signal and Image Processing Geometric Operations Geometric Operations •Transformations (Shift, Rotation, etc.) •Resizing •Adding/Correcting a Warp •Texture Mapping •Morphing Example: Texture Mapping •Mapping an image onto the surface of a geometric object •Provides increased realism Example: Morphing •Warp a pair of images based on corresponding points •Combination of warp/cross-dissolve Transformations •It all starts with the transformation –What do you want to go where? •Kinds of transformations: –Simple: •Translation, Rotation, Scale (or combinations) –Affine (6 parameter) –Perspective (8 parameter) –Arbitrary meshes B [ r ( x , y ), s ( x , y )] = A [ x , y ] AB Forward Mapping •Let x’ = r(x,y) and y’ = s(x,y) be a mapping from location (x,y) to (x’,y’). Forward Mapping - Problems •Doesn’t always map to pixel locations •Solution: spread out effect of each pixel AB AB ? Forward Mapping - Problems •May produce holes in the output B...
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geometry.slides.printing - CS 450 Introduction to Digital...

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