1. R. M. Haralick, The digital step edge, Pattern and Mach. Intell., to appear.
2. Zero-crossing of second direction derivative edge operator;Haralick,1982
3. Picture description using Legendre polynomials;Paton;Computer Graphics and Image Processing,1975
4. Applied Regression Analysis;Draper,1981
5. Web representation of image data;Hsu,1978