These images have been clipped to 480x512 and in this version are stored at half this resolution. A larger version of this array is available.(Click on any image for enlarged version.)
This is a comparison of three window sizes with four different contrast enhancement fractions. The images in each row were created with different cumulation function powers (alpha=0.75, 0.45, 0.15, 0) and matching proportions of local-mean replacement (beta=alpha). The window sizes for each row were 21x21, 41x41 and 81x81 from top to bottom.
The Fourier series method was used with 30 terms in each case.