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RT - RoTate - image or volume, use average as background

(8/25/97)

PURPOSE

Rotates a picture counter-clockwise around the center (NSAM/2 + 1, NROW/2 + 1). Note that the notions "clockwise" and "counter-clockwise" refer to the mirrored x-y system used for image display. The background rotated into the image field is the average of the input image

SEE ALSO

RT 3 [RoTate - volume, slow]
RT 3A [RoTate - volume, around arbitrary center]
RT 3D [RoTate - volume, fast]
RT 90 [RoTate - image or volume, by 90, 180, or 270 degrees]
RT B [RoTate - image or volume, supply background]
RT C [Rotate - image, around arbitrary center, for small files]
RT M [Rotate - image or volume, use minimum as background]
RT SQ [RoTate - image or volume, shift, use quadratic interpolation]

USAGE

.OPERATION: RT

.INPUT FILE: H_PIC001
[Enter the name of the file to be rotated.]

.OUTPUT FILE: H_IMG044
[Enter the name of the file where the rotated image is to be kept.]

.ROTATION ANGLE: 90.0
[Enter the rotation angle in degrees.]

[PIC001 will then be rotated 90 degrees, and the rotated image put in ROT001.]

NOTES

  1. The rotation angle can be specified by reference to a register: '-X10' will input the rotation angle (with inverted sign) found in a previous 'OR X10' operation. Whether or not the sign has to be inverted follows from the order of argument files in 'OR'.

  2. The input file may be three-dimensional. In this case, each of the slices is separately rotated around the z-axis, and stored in the output file which will be created with the same dimensions.

SUBROUTINES

ROT, ROT32

CALLER

UTIL3

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