the map corrected for a pseudo symmetry of one phase, detected by the tortuosity of its boundaries; MATLAB’s cleanUpPseudoSym

Syntax

ebsd, grains, numChanged = cleanUpPseudoSym(ebsd, grains, psSym)

Tortuosity above 1.5.

ebsd, grains, numChanged = cleanUpPseudoSym(ebsd, grains, psSym, threshold=2)

Only the more tortuous.

Description

A pseudo symmetry is a rotation which is not a symmetry of the crystal but maps the diffraction pattern almost onto itself, so the indexing picks between the two solutions at random. The boundaries this leaves follow the indexing noise, much longer than the distance between their ends.

The boundaries of the phase whose misorientation lies within delta of psSym are grouped into connected components. A component of more than four segments whose length exceeds threshold times the diagonal of its bounding box is taken for an artefact: the grains across it are merged, and every measurement of a merged grain is turned by the pseudo symmetry operator that brings it nearest the merged grain’s mean orientation.

psSym, its inverse or any equivalent misorientation give the same result. The phase is the one of psSym’s crystal frame, one phase per call. Do not smooth the boundaries first, which destroys their tortuosity.

As calcGrains, the function alters the map it is given, its rotations and grain ids, and grains gets the parentId of the merge. The mean orientations of the merged grains are those of the measurements before the correction, as in MATLAB; calcGrains again for the corrected ones.

Input

`ebsd`	EBSD with the grain ids calcGrains stores
`grains`	grain2d of the map
`psSym`	orientation, a misorientation of the phase with itself (psSym.CS is psSym.SS)

Keywords

keyword	default	description
`delta`	`2*degree`	the largest angle between a boundary misorientation and psSym
`threshold`	`1.5`	the smallest tortuosity, the length of a component over the diagonal of its bounding box, taken for an artefact

Output

`ebsd`	EBSD, the map passed, corrected
`grains`	grain2d, the merged grains
`numChanged`	the number of measurements whose orientation changed

Used on

EBSDPseudoSymmetry

MATLAB’s cleanUpPseudoSym

source

Citing this page. This page is part of the documentation of MTEX, a free and open source MATLAB toolbox for analyzing and modeling crystallographic textures. It was written by The MTEX Developers and is published at https://mtex-toolbox.github.io/cleanUpPseudoSym_py.html. If you use MTEX, or reuse text or figures from this page, in your research, please cite

F. Bachmann, R. Hielscher, H. Schaeben: Texture Analysis with MTEX - Free and Open Source Software Toolbox, Solid State Phenomena 160 (2010), 63-68. 10.4028/www.scientific.net/SSP.160.63

BibTeX

@article{bachmann2010mtex,
  author  = {F. Bachmann and R. Hielscher and H. Schaeben},
  title   = {Texture Analysis with MTEX - Free and Open Source Software Toolbox},
  journal = {Solid State Phenomena},
  volume  = {160},
  pages   = {63-68},
  year    = {2010},
  doi     = {10.4028/www.scientific.net/SSP.160.63},
  url     = {https://doi.org/10.4028/www.scientific.net/SSP.160.63}
}

Other papers describing specific MTEX methods are listed under Publications — please cite the one that best fits your application. The MTEX source code is licensed under the GNU General Public License v2.0; the text and figures of this documentation are licensed under CC BY 4.0, which permits reuse — including by automated systems — provided The MTEX Developers and this page are credited.

cleanUpPseudoSym