HOME GUIDE OPERATIONS DOCS FAQ TECHNIQUES FORMATS INSTALL NEW TIPS WEB LINKS Wadsworth Labs

PJ 3Q O - Project - 3D volume using Eulerian angles (older version) ||

(9/02/04)

PURPOSE

Computes projection(s) of a 3D volume according to the three Eulerian angles. This older version has greater aliasing than the current operation.

SEE ALSO

PJ 3 [Project - 3D volume]
PJ 3Q [Project - 3D volume using Eulerian angles ||]
PJ AT [Project - 3D volume using exponential Attenuation]
PJ CYL [Project - 3D volume onto Cylinder]
RT SQ [Rotate and Shift - image, Quadratic interpolation ||]

USAGE

.OPERATION: PJ 3Q O

.3-D INPUT FILE: vol001
[Enter the name of the volume whose projections are to be computed. This should be a cube!]

.RADIUS OF THE OBJECT: 26.0
[The projections are computed only for the object inside the sphere of the given radius.]

.ENTER ANGLE NUMBERS OR SELECTION DOC. FILE NAME: 1-700 or SEL001
[Enter selected angle numbers OR the name of the document file containing the selected angle numbers. Projections will only be calculated for the selected sets of angles from the following angles doc. file. (If you use a selection doc. file then the selected numbers are taken from the first register in the file.)]

.ANGLES DOC. FILE: ANGLES
[Enter the name of the document file containing the Eulerian angles for the projections. The angles have to be given in the order: psi, theta, phi. The meaning of the angles is the same as in operation 'RT SQ'. Projections will be calculated for every entry specified in the previous question.]

.ENTER TEMPLATE FOR 2-D PROJECTIONS: PRJ****
[Enter the template for the output files which will contain the 2-D projections.]

NOTES

  1. Memory requirements: NSAM*NROW+12*R**3+15*R**2, where R is the radius, but no more than: 6*NSAM*NROW+NSAM*NROW*NSLICE

  2. The projection file has always dimensions NSAM x NROW.

  3. For a projection of the whole volume (not the internal sphere only) give a radius larger than any linear dimension of the volume. Please note that usually such a projection is incorrect and the program takes much longer!

  4. Implemented by: P.Penczek.

SUBROUTINES

PJ3Q, PREPCUB_Q, WRITPRO, WPRO

CALLER

VTIL2

© Copyright Notice /       Enquiries: spider@wadsworth.org