References

Bovik, A.C., M. Clark and W.S. Geisler, 1990. Multichannel texture analysis using localized spatial filters. IEEE Trans. Pattern Anal. Machine Intel., 12: 55-73.
CrossRef  |  

Bracewell, R.N., 1978. The Fourier Transform and its Applications. McGraw-Hill, New York.

Chang, M.S., S.M. Kang, W.S. Rho, H.G. Kim and D.J. Kim, 1995. Improved binarization algorithm for document image by histogram and edge detection. Proceeding of the 3rd International Conference on Document Analysis and Recognition, August 14-16, 1995, Canada, pp: 636-639.

Cheng, H.D., Y.H. Chen and Y. Sun, 1999. A novel fuzzy entropy approach to image enhancement and thresholding. Signal Proc., 75: 277-301.
CrossRef  |  

Choi, Y.S. and R. Krishnapuram, 1997. A robust approach to image enhancement based on fuzzy logic. IEEE Trans. Image Proc., 6: 808-825.
CrossRef  |  

Don, H.S., 1995. A noise attribute thresholding method for document image binarization. Proceeding of the 3rd International Conference on Document Analysis and Recognition, August 14-16, 1995, Canada, pp: 231-234.

Farbiz, F., M.B. Menhaj, S.A. Motamedi and M.T. Hagan, 2000. A new fuzzy logic filter for image enhancement. IEEE Trans. Syst. Man. Cybern. B Cybern., 30: 110-119.
CrossRef  |  

Freeman, W.T. and E.H. Adelson, 1991. The design and use of steerable filters. IEEE Trans. Pattern Anal. Mach. Intell., 13: 891-906.
CrossRef  |  

Gatos, B., I. Pratikakis and S.J. Perantonis, 2004. An adaptive binarization technique for low quality historical documents. Proceeding of the 6th International Workshop, DAS, September 8-10, 2004, Florence, Italy, pp: 102-113.

Hobby, J. and T.K. Ho, 1997. Enhancing degraded document images via bitmap clustering and averaging. Proceedings of the Fourth International Conference on Document Analysis and Recognition, August 18-20, 1997, Ulm, Germany, pp: 394-400.

Hsieh, J., 1995. Image enhancement with a fuzzy logic approach. Electronics Lett., 31: 708-710.
CrossRef  |  

Jang, J.H. and K.S. Hong, 1999. Binarization of noisy gray-scale character images by thin line modeling. Pattern Rec., 32: 743-752.
CrossRef  |  

Kavallieratou, E. and E. Stamatatos, 2006. Improving the quality of degraded document images. Proceeding of the 2nd International Conference on Document Image Analysis for Libraries, April 27-28, 2006, Lyon, France, pp: 349-349.

Koenderink, J.J. and A.J. van Doorn, 1987. Representation of local geometry in the visual system. Biolog. Cybern., 55: 367-375.
CrossRef  |  Direct Link  |  

Lai, Y.J. and C.L. Hwang, 1992. Fuzzy Mathematical Programming. Springer-Verlag, Berlin, Germany, pp: 301.

Lee, Y.H. and S.Y. Park, 1990. A study of convex/concave edges and edge-enhancing operators based on the Laplacian. IEEE Trans. Circuits Syst., 37: 940-946.
CrossRef  |  

Liu, G.J., J.H. Huang, X.L. Tang and J.F. Liu, 2004. A novel fuzzy wavelet approach to contrast enhancement. Mach. Learn. Cybernet., 7: 4325-4330.
CrossRef  |  

Marinai, S., M. Gori and G. Soda, 2005. Artificial neural networks for document analysis and recognition. IEEE Trans. Pattern Anal. Mach. Intell., 27: 23-35.
CrossRef  |  

Mitra, S.K., H. Li, I.S. Lin and T.H. Yu, 1991. A new class of nonlinear filters for image enhancement. Proceedings of International Conference on Acoustics, Speech, and Signal Processing, Vol. 4, April 14-17, 1991, Toronto, Ont., pp: 2525-2528.

Negishi, H., J. Kato, H. Hase and T. Watanabe, 1999. Character extraction from noisy background for an automatic reference system. Proceeding of the 5th International Conference on Document Analysis and Recognition, September 20-22, 1999, Bangalore, pp: 143-146.

Polesel, A., G. Ramponi and V.J. Mathews, 2000. Image enhancement via adaptive unsharp masking. IEEE Trans. Image Process., 9: 505-510.
CrossRef  |  

Ramponi, G., 1998. A cubic unsharp masking technique for contrast enhancement. Signal Proc., 67: 211-222.
CrossRef  |  

Simoncelli, E.P. and W.T. Freeman, 1995. The steerable pyramid: a flexible architecture for multi-scale derivative computation. Proceeding of the International Conference on Image Processing, vol. 3, October 23-26, 1995, Washington, DC., pp: 444-447.

Su, L., M. Ahmadi and M. Shridhar, 1994. Morphological approach to text string extraction from regular periodic overlapping text/background images. CVGIP: Graph. Models Image Proc., 56: 402-413.
CrossRef  |  

Zimmermann, H.J., 2001. Fuzzy Set Theory and Its Applications. 4th Edn., Kluwer Academic Publishers, Boston Dordrecht London.