AC MSS - Self Correlation - Masked and normalized ||

(10/08/00)

PURPOSE

Calculates self-correlation coefficients for an image under a circular mask. Coefficients are normalized. Image is padded with zeros. Works only for real images (not their Fourier transforms!).   Example.

SEE ALSO

AC [Auto Correlation ||]
AC N [Auto Correlation - Normalized ||]
AC S [Self Correlation ||]
AC NS [Self Correlation - Normalized ||]

USAGE

.OPERATION: AC MSS

.INPUT FILE: PIC001
[Enter the name of the image to be self-correlated.]

.OUTPUT FILE: MAC001
[Enter name of the file which will contain SAC coefficients.]

.MASK RADIUS: 25
[Enter radius of the circular mask which will be centered at NX/2+1, NY/2+1]

.(F)ULL OR (H)ALF OUTPUT FILE: F
['F' results in a autocorrelation function file with dimensions 2*NX, 2*NY (useful for mask radius =>MAX(NX/4,NY/4).

'H' results in a selfcorrelation function file with dimensions NX,NY (enough if one is interested only in lower order SACF coefficients. or mask radius is small)]

NOTES

  1. See documentation on 'AC' for the location of the origin.

  2. For non-masked self-correlation function use 'AC S'.

  3. Implemented by Paul Penczek.

SUBROUTINES

MACF, MACF_P, FMRS_2, FMRS_1, FFTMCF, ACRS_2, ACRS_2S

CALLER

CORR1

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