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FF S - Fourier Filter - restore Surface topography

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PURPOSE

Restores surface topography from a micrograph of a shadowed surface relief. [Reference: Smith and Kistler, J.Ultrastr.Res. 61 (1977) 124-133.] PROGRAM NOT TESTED - RESULTS MAY BE INCORRECT

USAGE

.OPERATION: FF S

.INPUT FILE: FOU001
[Enter name of input file containing Fourier transform of data. The file will be overwritten by the filtered transform.]

.(E)XACT CORRECTION OR (P)HASE CORRECTION ONLY: E
[Specify filter mode. Enter 'E' for combined phase and amplitude correction, or 'P' for phase correction only. cf Smith and Kistler paper.]

.SHADOWING ANGLE THETA: 45.
[Enter shadowing elevation angle with respect to plane of specimen, i.e. 90 degrees for perpendicular shadowing.]

.DEPOSIT THICKNESS D: 5
[Enter vertical thickness of metal deposit (parameter D in Smith/Kistler paper), in sampling units.]

.EPSILON: 0.01
[Epsilon is the smallest value permitted for ABS(1-exp(-2PI Ra)) so that unreasonable noise amplification is avoided.]

.SHADOWING AZIMUTH PHI: 30.
[Enter azimuth of base line of shadowing vector, in degrees. The azimuth is measured with respect to the direction of the x-axis.]

SUBROUTINES

FSHADO

CALLER

FOUR1

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