Preprocessor for Programs which Recognize Scenes
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A visual scene is transformed from a very simple and convenient format, to an internal format which describes the same scene, but is more akin to complex manipulations. This format is compatible with programs like "SEE". The entire analysis is done using a basic primitive which gives the orientation of a point with respect to a directed line. A novel handling of inaccuracies in the scene is achieved by considering the lines to be stripes of small but negligible width. The criterion is very general and easy to modify.