Abstract
Researchers in image processing and pattern recognition have traditionally regarded pictures as two-dimensional array of pixels. Recently, researchers working on pictorial information systems have developed the concept of logical pictures, which consist of picture objects and picture relations. The concept of relational database has also been used in developing pictorial database models, although there seems to be a need to extend the relational database concept for pictorial database management. On the other hand, for many image processing problems, a hierarchical data structure seems to be the most natural.
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