HOME GUIDE OPERATIONS DOCS ERRORS FORMATS INSTALL NEW TIPS WEB SITES

PW L - PoWer spectrum - Log10

(8/27/96)

PURPOSE

Generates full, unscrambled logarithm of Fourier moduli from complex Fourier transform on disk for 2-D or 3-D pictures. The input 2D image can be real if it fits into the memory. Operations supports multiple radix FFT, thus the input image does not have to have power-of-two dimensions (see 'FT'). The resulting data are real and can be displayed like a normal picture.

SEE ALSO

PW [PoWer spectrum]

USAGE

.OPERATION: PW L

.INPUT FILE: FOU001
[Enter the file name of the Fourier transform.]

.OUTPUT FILE: POW001
[Enter the name of the file where the power spectrum is to be kept.]

NOTES

  1. The center of 2-D power spectrum is placed in (NSAM/2+1,NROW/2+1); for 3-D case in (NSAM/2+1,NROW/2+1,NSLICE/2+1).

  2. Memory requirements:
     
              input image                memory in words 
                 2d real                   (NSAM+2)*NROW 
                 2d complex                (NSAM+2)*NROW 
                 3d real                   (NSAM+2)NROW*NSLICE 
    

SUBROUTINES

PW2S, PW2SD, PW2SDR, PW2SR, PW3S, PW3SD, PW3SDR, PW3SR

CALLER

FOUR1 , FOUR1B

© Copyright Notice /       Enquiries: spider@wadsworth.org