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2d z-string: A new spatial knowledge representation for image databases

PATTERN RECOGNITION LETTERS 2003年第16期24卷 3015-3026页

作者： Lee, AJT Chiu, HP Natl Taiwan Univ Dept Informat Management Taipei 106 Taiwan

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.

关键词： iconic indexing image database 2d z-string 2d C-string 2d C+-string

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3d z-string: A new knowledge structure to represent spatio-temporal relations between objects in a video

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PATTERN RECOGNITION LETTERS 2005年第16期26卷 2500-2508页

作者： Lee, AJT Yu, P Chiu, HP Hong, RW Natl Taiwan Univ Dept Informat Management 1Sect 4Roosevelt Rd Taipei 10617 Taiwan MIT Dept EECS Cambridge MA 02139 USA

In this paper, we propose a new knowledge structure called 3d z-string, extended from the 2d z-string, to represent the spatial and temporal relations between objects in a video and to keep track of the motions and size changes of the objects. Since there are no cuttings between objects in the 3d z-string, the integrity of objects is preserved. The string generation and video reconstruction algorithms for the 3d z-string representation of video objects are also developed. The string generated by the string generation algorithm is unique for a given video and the video reconstructed from a given 3d z-string is unique too. The experimental results show that the 3d z-string is more compact and efficient than the 3d C-string in terms of storage space and execution time. (c) 2005 Elsevier B.V. All rights reserved.

关键词： iconic indexing video databases 3d z-string 3d C-string 2d z-string

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