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<p>Several iconic indexes for representing three-dimensional scenes are presented. The approach extends previous work in iconic indexing of two-dimensional scenes in a unified manner. Good characteristics for iconic indexes are also pointed out. OPP2 and OPP3, two-dimensional iconic indexes for three-dimensional scenes, are introduced. The problem of ambiguity in the OPP2 and OPP3 representations of three-dimensional scenes is studied in detail and a class of images for which they are unambiguous is identified. The Genstring, a linear iconic index which can be used to represent two-, three-, or higher-dimensional scenes, is introduced. It provides a compact, unambiguous representation of a three-dimensional scene. The Genstring takes advantage of previous work, thus providing fast pattern matching for higher-dimensional scenes. In fact, the pattern matching algorithm given for k-dimensional scenes is as fast as that previously given for two-dimensional scenes.</p>
2-D scenes; unifying approach; iconic indexing; 3-D scenes; OPP2; OPP3; Genstring; linear iconic index; pattern matching; computerised pattern recognition; computerised picture processing; database management systems; graphical user interfaces; indexing; information retrieval

T. Arndt, G. Tortora and G. Costagliola, "A Unifying Approach to Iconic Indexing for 2-D and 3-D Scenes," in IEEE Transactions on Knowledge & Data Engineering, vol. 4, no. , pp. 205-222, 1992.
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