.Selection doc file: SELECT
[Enter selection document file name containing the numbers
of the input images in the first column.]
.MASK FILE: MAS999
[Enter the name of mask image for masking each image in the set]
.RING WIDTH: 0.5
[Enter ring width of each frequency radius for SSNR computation.]
.DOCUMENT FILE: DOC001
[Enter name of resulting document file.]
FR(I) = N*{SUM(SIG(kX,kY))/SUM[NOI(kX,kY)/(N-1)]}
Sum over Fourier units in each ring of radius I
NOTES
[2] M. Unser, B.L.Trus & A.C. Steven, Ultramicroscopy 30(1989)
429-434: "The Spectral Signal-to-Noise Ratio Resolution
Criterion: Computational Efficiency and Statistical
Precision"