compare every measurement with the reference orientation of its grain.

Syntax

mis2mean = calcGROD(ebsd, grains)

Description

For an MTEX object, calcGROD(x, …) calls x.calcGROD(…). Additional positional and keyword arguments are passed to that method unchanged. Its documentation specifies the accepted inputs, units, symmetry handling and optional outputs. Consult the corresponding method for the behaviour of a particular object type.

Example

Compare each Forsterite orientation with the mean of its reconstructed grain. The small sample is downloaded and cached on first use.

import numpy as np
import matplotlib.pyplot as plt
from mtex import mtexdata, calcGrains, calcGROD, degree, plot, hold, mtexColorbar

ebsd = mtexdata('small', verbose=False)['Forsterite']
grains = calcGrains(ebsd, angle=10*degree, minPixel=5)
grod = calcGROD(ebsd, grains)
omega = grod.angle()/degree
print('Median deviation from grain mean (degrees):', round(float(np.nanmedian(omega)), 3))
plot(ebsd, omega, colorRange=(0, 5))
mtexColorbar(title='GROD angle (degrees)')
hold(True)
plot(grains.boundary, lineWidth=1)
hold(False)
plt.show()

The result contains misorientations; angle extracts their magnitudes. GROD uses a grain reference, while KAM uses local neighbours. Select one indexed phase before calculating GROD; pixels without a reconstructed grain have no grain reference and give NaN.

Median deviation from grain mean (degrees): 1.266

Example output for EBSD.calcGROD

Signature

calcGROD(x, *args, **kwargs)

Methods it calls

EBSD	the grain reference orientation deviation, mis2mean: the misorientation of every pixel from the mean orientation of its grain, or from a given reference

Used on

GrainOrientationParameters

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/calcGROD_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.