A method of mapImage.

the image values at arbitrary positions; MATLAB’s mapImage.interp

Syntax

v = mg.interp(pos)

Bilinear, NaN outside the grid.

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

The value of the pixel covering it.

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

The nearest border value outside.

Description

The positions reduce to fractional rows and columns of the regular grid, which are interpolated: ‘linear’ bilinearly, ‘nearest’ by the covering pixel, and ‘cubic’, ‘spline’ or ‘makima’ through SciPy’s RegularGridInterpolator (cubic, quintic and pchip). Resampling onto another grid is this at the positions of the target.

Input

mg mapImage
pos vector3d, or an (…, 2) or (…, 3) array of positions

Keywords

keyword default description
method 'linear' ‘linear’, ‘nearest’, ‘cubic’, ‘spline’ or ‘makima’
extrapolationMethod 'none' ‘none’, NaN outside the grid, or ‘nearest’, the border value

Output

v array of the shape of pos, with the channels as a last axis when there are several

See also

mapImage.pos2ind, EBSD.interp

MATLAB’s mapImage.interp

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/mapImage.interp_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.