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1 2001

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Interpolatory edge detection

Zeng P. F., Hirata T.

Machine Graphics and Vision

2001

Vol. 10, No. 2

175-184

Conventional edge operators cannot detect fine edges or edges in low-resolution images in a satisfactory way. In this paper, an interpolatory edge operator is proposed to deal with fine edge detection as a supplement. Fast image expansion is implemented by means of B-spline imterpolation. Edges are determined by seeking pixels with a local maximum of first derivative modulus (modulus maximum). The first derivatives can be calculed quickly by translation and substration along x and y directions if images interpolated by B-splines. Experimental results imply that the proposed interpolatory edge operator can satisfactorily solve the fine edge detection problem in cases when coventional edge operators fail to produce a clear output. Satisfacory results can be obtained when images are interpolated with the expansion rate of three.