Abstract
This chapter describes the 2D string representation as the symbolic projection of a picture, and defines the absolute, normal, and reduced 2D strings. The chapter also presents algorithms for picture reconstruction from the 2D string, and defines the augmented 2D string, as well as picture matching by 2D subsequence matching. It outlines the methodology of iconic indexing and analyzes the problem of ambiguous pictures and their characterization. A summary of the algorithms and ambiguity results for the various 2D string representations is presented as well. The 2D string representation is ideally suited for formulating picture queries.
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