Optimizations done
--------------------

1. Made Iterative FFT 
2. Minimized Paramter Passing esp. copying of arrays
2.5 No dynamic memory allocation
3. Use of Inline functions
4. Bit shifting used - Optimized math operations
5. Recomputation of FFT avoided for each filter - use copy
6. For Ideal High Pass optimization done

--Spatial

1. LOCAL HISTOGRAM EQUAL  WINDOW MOVING



Features
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1. Inbuilt timers
2. Menu driven program 
3. Save option at each step
4. Automatic centering of FFT done

Concepts
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*  Explanation ringing effect.
*  Butterworth approaches high pass