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<p><b>Abstract</b>—Spatial relationships are important ingredients for expressing constraints in retrieval systems for pictorial or multimedia databases. We have proposed a unified representation for spatial relationships, 2D Projection Interval Relationships (2D-PIR), that integrates both directional and topological relationships. In this paper we develop techniques for similarity retrieval based on the 2D-PIR representation, including a method for dealing with rotated and reflected images.</p>
Spatial relationships, similarity retrieval, 2D-PIR, pictorial databases, multimedia databases.

M. Nabil, J. Shepherd and A. H. Ngu, "Picture Similarity Retrieval Using the 2D Projection Interval Representation," in IEEE Transactions on Knowledge & Data Engineering, vol. 8, no. , pp. 533-539, 1996.
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