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RM 2D - Two-dimensional Radon Transform

(3/19/90)

PURPOSE

Computes the Radon transform of a two-dimensional image.

USAGE

.OPERATION: RM 2D

.INPUT FILE: IMAGE001
[Enter name of two-dimensional image]

.RANGE OF ALPHA FROM,TO (IN DEGREES): -90,85
[Enter angular range of transform]

.IN INCREMENTS OF: 5
[Enter angular sampling of Radon transform. The range and increment is stored in the file header of the output file in positions 54,55 and 56]

.OUTPUT FILE: RAD001
[Enter name of output file]

.X-DIMENSION OF OUTPUT: 40
[Enter the line dimension of the Radon transform]

.RADIUS OF CIRCULAR MASK:20
[Enter mask radius. Only image values within this mask are used in the calculation of the Radon transform]

.CENTER OFFSET: 0,0
[The rotation center for the calculation of the Radon transform is NSAM/2+1, NROW/2+1, but can be shifted by entering an offset]

.(A)verage threshold,(T)hreshold/(L)ift/(N)one:
[Enter option: A: subtracts average and then sets all negative values to 0. T: applies thresholds, L: subtracts minmum from image, N: no changes of input image ]

If "T" is answered:

.upper, lower threshold: -0.1,0.4
[The image is thresholded below -0.5 and above 0.4 before calculation of the 1D projections.]

NOTES

  1. For more details see: M.Radermacher, Ultramicroscopy 53, 1994, 121-136

  2. Not Distributed!

SUBROUTINES

RAD2CALL, RADON2E

CALLER

UTIL5

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