Projection_neighbourhood

angular_neighbourhood

Purpose

For each defined projection direction neighbourhood, this program computes the angular distance between the neighbourhood and all images in the input selfile. Every image that has an angular distance smaller than the distance given with the option-dist, will be added to the output selfile of that neighbourhood. The angular distance (in degrees) is defined assqrt{ (rot_image - rot_nbh)2 + (tilt_image - tilt_nbh)2 }

Usage

$ angular_neighbourhood ...

Paramters

• `` Selection files containing the images
• `` Document file containing therot and`tilt` angles (in resp. 1st and 2nd column) for each defined projection direction neighbourhood. This file could for example be created using`xmipp_project -only_create_angles`.
• -oroot [rootnamenbhood] = Rootname for output files. For each defined projection direction neighbourhood a selfile[output rootname][seed].sel will be created
• -dist [distance10] = Maximum angular distance for reflections to be associated to a neighbourhood
• `` Symmetry file if the particle is symmetric. The description of this file may be found at xmipp_symmetrize
• `` If this option is given, all projections and their symmetry equivalents, which are on the southern hemi-sphere (i.e.ABS(tilt)>90 deg) will be flipped to the northern hemi-sphere, by the operation:`tilt`tilt+180=

Examples and notes

A typical use of this program is

$ angular_neighbourhood -nbh neighbourhoods.doc -i images.sel -oroot 7degnbh -dist 7

For each projection direction neighbourhood, this program writes out a selfile7degnbh[seed].sel, with[seed] being the number of the neighbourhood in the document file.

--Main.AlfredoSolano - 29 Jan 200