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Issue No. 04 - April (1986 vol. 8)
ISSN: 0162-8828
pp: 520-524
Lawrence O'Gorman , AT&T Bell Laboratories, Murray Hill, NJ 07974.
Arthur C. Sanderson , The Robotics Institute and the Department of Electrical and Computer Engineering, Carnegie-Mellon University, Pittsburgh, PA 15213.
In [1], the converging squares algorithm was introduced as a method designed to effectively and efficiently locate peaks in data of two dimensions or higher. In this correspondence, the performance of the algorithm on a signal in noise is examined, and some extensions of the algorithm-beyond peak-picking-are introduced. The minimum-area enclosing square is one extension, which locates an image region in a uniform background, and finds the smallest square which entirely encloses it. The maximum-difference enclosing square is another extension by which a global feature of the image is found which separates it into a foreground square region and background region, based on the maximum statistical difference between the two. Some applications of these extensions are shown, including object location, tracking of a moving object, and adaptive binarization.

L. O'Gorman and A. C. Sanderson, "Some Extensions of the Converging Squares Algorithm for Image Feature Analysis," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 8, no. , pp. 520-524, 1986.
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