OR MAP - ORientation MAP - 2D, rotational cross correlation plot ||

(6/06/08)

PURPOSE

Maps rotational cross correlation between two images. Usefull for studing orientation and particle symmetry. Can compare rotational orientation of two images and examine variation in cross-correlation by radius. Uses resampling into polar coordinates. (See align_overview.html for comparison of 'AP' and 'OR' operations.)   Example.

SEE ALSO

OR R [ORientation Search - 2D, rotation, uses polar coords. ||]
OR SH [Orientation Search - 2D, rotation & shift, uses polar coords. ||]

USAGE

.OPERATION: OR MAP [ang],[peak]

[The optional output parameters: [ang],[peak] specify register variables to receive the rotation angle and the value of the angles correlation peak.]

.EXPERIMENTAL IMAGE: EXP001
[Enter name of the image file.]

.REFERENCE IMAGE: REF002
[Enter the name of the file containing the reference image. Dimensions must be same as the experimental image.]

.FIRST & LAST RING: 5, 30
[Only polar coordinate rings with the radii in the range 5-15 (in pixel units) will be analyzed.]

.POLAR CC IMAGE: REF002
[Enter the name of the file for polar cross-correlations. This is an image showing distribution of cross-correlation by angle for the requested rings. Dimensions will be 360 x maximum radius requested.]

.GNUPLOT SCRIPT FILE: gnuscript
[Enter name for file containing Gnuplot script. The actual data used by this script is kept in a second file: with _DATA appended to the basename (here it would be: gnuscript_DATA.ext. ]

If a Gnuplot file is requested SPIDER asks:

.PLOT RADII: 5-27
[Only polar coordinate rings with the radii in the range 5-15 (in pixel units) will be plotted. Only those rings requested above are available for plotting.]

NOTES

  1. Implemented by: ArDean Leith

  2. This is somewhat similar to legacy operation: 'OR F'.

SUBROUTINES

ORMAP, SETNUMRINGS, APRINGS, CROSRNG_COM, PRB1D, ANG_N

CALLER

UTIL3

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