The author shows how a scale dimension can be added to Marr's (1976) primal sketch to facilitate construction of multiscale descriptions of two-dimensional scales. In contrast to conventional scale-space approaches, this method omits any smoothing or blurring and performs grouping operations on symbolic shape tokens residing in a scale-space blackboard data structure. Two types of grouping operation are introduced: (1) fine-to-coarse aggregation of primitive-edge tokens builds coarser-scale edge maps from finer-scale information; and (2) pairwise grouping of symmetrically placed primitive edges gives rise to a primitive partial region token denoting curved-contour, primitive-corner, and bar events. The resulting collection of tokens makes the fundamental edge and region components of a shape's geometry available to later symbolic processes, leading to shape recognition or other tasks.<>


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    Title :

    Adding scale to the primal sketch


    Contributors:
    Saund, E. (author)


    Publication date :

    1989-01-01


    Size :

    758406 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




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