Cotton leaf diseases have occurred all over the world including India. They have significant impact on quality and yield of cotton. This paper select bacterial leaf blight, myrothecium and grey mildew as study object. The testing samples of the images are gathered from CICR Nagpur. The image enhancement techniques used include histogram equalization, decorelation stretching, linear contrast stretch, intensity adjustment and filtering.

1. B. Fagin and C. Renard, "Field Programmable Gate Arrays and Floating Point Arithmetic," IEEE Transactions on VLSI,Vol. 2, No. 3, pp. 365-367, September 1994.
2. W. B. Ligon, S. McMillan, G. Mpnn, F. Stivers, and K. D. Underwood "A Re-revelation of the Practicality of Floating Point Operations on FPGAs", Proceedings, IEEE Symposium on Field-Programmable Custom Computing Machines, pp. 206- 215, Napa, CA, Apr. 1998. (ICANN'99).
3. S. ªahin, A. Kavak. , "Implementation of Floating Point Arithmetic Using an FPGA", Mathematical Methods in Engineering. Editors K. TAS, J. A. T. Machado and D. Baleanu,Springer Book, 2007.
4. Kazumitsutakeda, Fumiakiishino, Yoshitakaito,Ryotakasai and Takayoshi nakashima,' "A Single-chip 80 bit floating Point processor"IEEE Journal of Solid State Circuits, Vol sc-20 No5, Octoberj. 1985.
5. Frederick A. ware, William H. Mcallister, John R. Carlson, dank and Richard Vlach "64 bit Monolithic Floating Point Processor" IEEE Journal of solid-state circuits, Vol. Sc-17,No. 5, October 1982.
6. John P. Hayes "Computer architecture and Organization" McGraw-Hill International editions, third Edition 1998.

Histogram Equalization Unsharp Filtering