mapImage.interp edit page

the image values at arbitrary positions

This is the fast path a regular grid buys: the query reduces to fractional row and column coordinates, so it is a griddedInterpolant rather than the scatteredInterpolant EBSD/interp has to use for grids that may be rotated or distorted.

Resampling onto another grid is this plus a target position set, and correcting a distortion is the same call with inv(T):

v = interp(mg, eval(inv(T),target.pos))

Syntax

v = interp(mg,pos)
v = interp(mg,pos,'nearest')
v = interp(mg,pos,'extrapolationMethod','nearest')

Input

mg mapImage
pos vector3d, where to sample

Options

linear, nearest, cubic, spline interpolation method, default linear
extrapolationMethod default 'none', i.e. NaN outside

Output

v values, size(pos) by nChannel

See also

mapImage mapImage.pos2ind EBSD.interp

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/mapImage.interp.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.