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Wednesday, September 19, 2007
 

Why "Seeing" is More Than Just Registering an Image


Few would argue against the statement "perception is a key component of artificial intelligent systems". A game-playing agent must "perceive" the game world before choosing a move, while a robot must "see" the real-world in order select a path or construct a motion plan etc. But, the game playing agent needs no special machinery to "see" the game world, and the robot might use a laser range finder to map out obstacles in the real world. So is perception a solved problem? I, and many others, would argue 'no'; at least not when it comes to vision. The following example, highlights some of the complexities of vision:











(Marr, D. 1982 Vision: a Computational Investigation into the Human Representation and Processing of Visual Information. Henry Holt and Co., Inc. pp. 51)



What if I were to tell you that each figure contains three layers? The lowest layer is an outline of a triangle. The middle layer is a collection of solid circles. The top layer is a triangle-like shape, with one curved edge. Which edge is curved, and is it concave or convex? Do you see this shape where no lines exist? (Note that my "lowest" layers are not unique, nor are they fixed. Since there is no overlap their order can be inverted, or they can be compressed into a single layer).

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Copyright © 2007, Adam Fourney