FP - Interpolate/Resize using Fourier transform ||

(09/02/09)

PURPOSE

This operation has been renamed 'IP FT' and will go away in a future SPIDER release. Takes input image/volume of any dimension and creates interpolated image/volume of any dimension. Creates enlarged image/volume using zero padding in Fourier Space.   Example.

SEE ALSO

IP FT [Interpolate/Resize - using Fourier Transform ||]
IP FS [Interpolate/resize image/volume - using Fourier based cubic spline ||]
IP T [Interpolate/Resize - using Triangular interpolation]
DC [Decimate image/volume]

USAGE

.OPERATION: FP

.INPUT FILE: PIC001
[Enter name of file containing input image/volume.]

.INTERPOLATED OUTPUT FILE: IMG022
[Enter name of file where output image/volume is to be placed.]

If input file is an image, SPIDER asks:


.DIMENSIONS (NX, NY): 72, 48,
[Enter interpolated X & Y dimensions for the output image]

If input file is a volume, SPIDER asks:


.DIMENSIONS (NX, NY, NZ): 72, 48, 50
[Enter interpolated X, Y and Z dimensions for the output volume.]

NOTES

  1. Interpolation is exact in a sense that the total energy of an image is preserved. Note that the interpolation is not exact on the old grid!

  2. Pixel size in header is updated.

  3. Obsolete operation name!

SUBROUTINES

FOUR1A_FP, FINT, FINT3

CALLER

FOUR1

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