A contour based scheme for representing arbitrary shapes in digital images

Authors:
B. Rajesh Kanna;Chandrabose Aravindan;K. Kannan
Affiliations:
St. Joseph's College of Engineering, Chennai, India;SSN College of Engineering, Chennai, India;SASTRA University, Thanjavur, India
Venue:
Proceedings of the International Conference & Workshop on Emerging Trends in Technology
Year:
2011

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Abstract

Shapes in images provide important features for pattern recognition, pattern matching, content-based image retrieval, etc. In this paper, a contour based structural approach is proposed to represent any arbitrary shape in an image by an alpha-numeric string. The proposed method performs decomposition of the region into disjoint sub-regions by detecting the features of the contour such as bend points, vertical & horizontal straight lines, etc. The representation of those sub-regions is achieved by using strings in a six letter alphabet. The representation is invariant to size since it includes a size-based ratio. The drawbacks of existing contour-based shape representation techniques are discussed, and it is shown how this new method overcomes them.