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    Ullman's Visual Routines and Tekkotsu Sketches
    15-494 Cognitive Robotics David S. Touretzky & Ethan Tira-Thompson Carnegie Mellon Spring 2010
    04/27/10
    15-494 Cognitive Robotics
    1
    Parsing the Visual World

    How does intermediate level vision work

    How do we parse a scene

    Is the x inside or outside the closed curve
    04/27/10
    15-494 Cognitive Robotics
    2
    Ullman: Visual Routines

    Fixed set of composable operators. Wired into our brains. Operate on "base representations", produce "incremental representations". Can also operate on incremental representations. Examples:
    – – – – –




    shift of processing focus indexing (odd-man-out) boundary tracing marking bounded activation (coloring)
    15-494 Cognitive Robotics 3
    04/27/10
    Base Representations

    Derived automatically; no decisions to make. Derivation is fully parallel.


    Multiple parallel streams in the visual hierarchy.

    Describe local image properties such as color, orientation, texture, depth, motion. Marr's "primal sketch" and "2 -D Sketch"

    04/27/10
    15-494 Cognitive Robotics
    4
    Primal Sketch
    04/27/10
    15-494 Cognitive Robotics

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