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FL - Fourier List

(1/10/94)

PURPOSE

Lists moduli and phases of 2-D Fourier transformation.

SEE ALSO

FF [Fourier filter]
FP [Fourier interpolation]
FQ [Fourier quick]
FT [Fourier transformation]

USAGE

.OPERATION: FL

.INPUT FILE: FOU001
[Enter name of file containing 2-D Fourier transform.]

.(P)HASE/(M)ODULUS/(S)ELECT/(F)ILE SELECT: P/M/S/F
[Enter option listing

 
           Option "P" - Compact Phase Listing.  The 360 degree range of 
                        phase angles is mapped into 36 characters: 
                        ' ', 'A'...'Z', '1'...'9', which are printed out without 
                        intervening spaces, with 120 characters across the page. 

Option "M" - Compact Modulus Listing. The modulus of the Fourier transform is listed by 64 readable overprint characters (' ','A'...'Z','1'...'5' for the first 32, and '.','A'...'Z','1'...'5' for the next 32, which are printed on top of the first 32). Printout is without intervening spaces, with 120 characters across the page.

Note that the Fourier transform is listed in transposed form, with horizontal indices corresponding to vertical picture features, and vertical indices corresponding to horizontal picture features.

Option "S" - Listing of Selected Coefficients and Surrounding Area. Fourier phases and moduli within a window of specified size around selected Fourier coefficients are listed.

For 'S' the following information is solicited

.SCALE FACTOR (IN 1000):

.ENTER NUMBER OF COEFFICIENTS AND WINDOW SIZE (ODD): 3,5
[Enter number of selected coefficients and an odd number for the linear window size.]

SPIDER will now solicit the position for each coefficient:

.FOURIER SPACE POSITION (INDK,INDI): 4,10
[Enter Fourier Grid indices of selected coefficient.]

.H, K:

[Note that the first index corresponds to the horizontal picture direction (vertical in transposed Fourier). The second index corresponds to the vertical picture direction (horizontal in transposed Fourier).]

Option "F" - Listing of areas around coefficients contained in reflection file produced by 'WT' (lattice indexing) operation. As in option 'S', Fourier phases and moduli within a window of specified size around the coefficients are listed.]

.SCALE FACTOR (IN 1000):

.FILTER FILE: FLT001
[Enter name of reflection file containing the Fourier coordinates.]

.ENTER WINDOW SIZE:

SUBROUTINES

FLIST, FWIND

CALLER

FOUR1

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