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Definition of "quadtree" |
a quadtree represents structure in an image by repeatedly subdividing squares into quarters until each square is homogeneous.Quadtrees can be used for facsimile coding, for representing contiguous regions in primitive-based coding or for representing motion vector distributions. In facsimile,where the image consists of black and white values only, three codewords are required:S, B,W, meaning split-block, blackblock and white-block. Starting from large squares, each is analyzed and an appropriate codeword generated. If the codeword is S,then the same process is applied recursively to the four quarter-size blocks. |
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