FindCenter

find_center2d

Purpose

This program looks fo the position of the center of symmetry in an image. It is very useful when you want to calculate the rotational symmetry of a set of images by using xmipp_makespectra program.

Image dimensions must be less than 512x512

Usage

$ find_center2d ...

Parameters

• `` The input image file name
• `` The X coordinate of the center of the image
• `` The Y coordinate of the center of the image
• `` Indicates the lower radius for smoothing
• `` Indicates the higher radius for smoothing
• `` Indicates the lower integration radius
• `` Indicates the higher integration radius
• `` Indicates the integration increment. 1 by default
• `` Indicates the the harmonic you want to optimize. 1 by default
• `` Indicates the type of optimization to be done:
  • `` maximize
  • `` minimize (default)

This program has not yet been ported to theNewXmipp style. Therefore this program does NOT read the alignment parameters as stored in the headers of the images. If you have aligned your particles prior to using this program, use the applygeo program to actually perform the rotation and translation as stored in the header of the images!

Examples ad notes

$ find_center2d -img file.ave -x0 24.5 -y0 24.5 -low 20 -high 23 -r1 5 -r2 18

In this example, the center of symmetry offile.ave image will be calculated. The image has a 50x50 dimension, so the center is set to 24.5 by using-x0 and-y0 parameters. The smoothing radii is set to 20 and 23 by using-low and-high parameters. Integration radii (zone of interest for the symmetry) is set to 5 and 18 by using-r1 and-r2. The harmonic to be optimized is 1 and it is set by default.

When applied, the program will produce a result like the following:

$ Optimal center coordinates: x = 24.750, y = 24.750

USER's COMMENTS

--Main.AlfredoSolano - 17 Jan 2007