1. An optimal frequency domain filter for edge detection;Shanmugam;IEEE Trans. Patt. Anal. Mach. Intell.,1979
2. Gaussian derivative model for edge enhancement;Basu;Pattern Recog.,1994
3. C.S. Williams, O.A. Becklund, Introduction to the optical transfer function, Wiley Series in Pure and Applied Optics, Wiley, New York, 1989, pp. 57–59.
4. L. Yaroslavsky, The theory of optimal methods for localization of objects in pictures, in: M.L. Calvo and M. Chevalier (Eds.), Fundamentals, Applications and Analysis of Digital Image Processing, Book Notes, Spanish Optical Society (SEDO), CSIC, Madrid, 1994, pp. 70–272.
5. Edge focusing;Bergholm;IEEE Trans. Pattern Anal. Mach. Intell.,1987