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2D Z-string: A new spatial knowledge representation for image databases
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DOI：10.1016/S0167-8655(03)00162-4.png)
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Abstract
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The knowledge structure called the 2D C+-string, proposed by Huang et al., to represent symbolic pictures allows a natural way to construct iconic indexes for images. According to the cutting mechanism of the 2D C+-string, an object may be partitioned into several subparts. The number of partitioned subparts is bounded to O(n(2)), where n is the number of objects in the image. Hence, the string length is also bounded to O(n(2)). In this paper, we propose a new spatial knowledge representation called the 2D Z-string. Since there are no cuttings between objects in the 2D Z-string, the integrity of objects is preserved and the string length is bounded to 0(n). Finally, some experiments are conducted to compare the performance of both approaches. (C) 2003 Elsevier B.V. All rights reserved.
Keywords:
iconic indexing
image database
2D Z-string
2D C-string
2D C+-string
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