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Iconic Indexing by 2-D Strings

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3 Author(s)
Chang, Shi-Kuo ; Department of Electrical and Computer Engineering, Illinois Institute of Technology, Chicago, IL 60616; Department of Computer Science, University of Pittsburgh, Pittsburgh, PA 15260. ; Shi, Qing-Yun ; Yan, Cheng-Wen

In this paper, we describe a new way of representing a symbolic picture by a two-dimensional string. A picture query can also be specified as a 2-D string. The problem of pictorial information retrieval then becomes a problem of 2-D subsequence matching. We present algorithms for encoding a symbolic picture into its 2-D string representation, reconstructing a picture from its 2-D string representation, and matching a 2-D string with another 2-D string. We also prove the necessary and sufficient conditions to characterize ambiguous pictures for reduced 2-D strings as well as normal 2-D strings. This approach thus allows an efficient and natural way to construct iconic indexes for pictures.

Published in:

Pattern Analysis and Machine Intelligence, IEEE Transactions on  (Volume:PAMI-9 ,  Issue: 3 )

Date of Publication:

May 1987

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