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Definition of "Laplacian pyramid" |
a set of Laplacian images at multiple scales used in pyramid coding. An input image G1 is Gaussian lowpass filtered and downsampled to form G2. Typically G2 is one quarter the size of G1, i.e., it is downsampled by a factor of 2 in each direction. G2 is upsampled and Gaussian lowpass filtered to form R1 which is then subtracted fromG1 to give L1. The process then repeats using G2 as input. The sets of multiresolutionimages so generated are called “pyramids”: |
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