COLOR EDGE EXTRACTION USING ORTHOGONAL POLYNOMIALS BASED ZERO CROSSINGS SCHEME

A new color edge extraction scheme based on identifying the zero cross ings in the second directional derivatives, in terms of orthogonal pol ynomials has been proposed in this paper. The proposed scheme supports a complete set of finite difference operators which are easily config ured from orthogonal polynomials. A color image region in presence of Gaussian noise is represented as a linear combination of these operato rs towards color edges and noise. Statistical hypothesis testing proce dures are employed to separate out the responses towards noise from th ose towards color edges. The usage of the proposed framework is highli ghted in devising a color edge detector based on identifying the zero crossings in the second directional derivatives of the color image reg ion. The proposed color edge extraction scheme is also compared with t wo existing color edge extraction schemes. (C) 1998 Published by Elsev ier Science Inc. All rights reserved.