pyxem / kikuchipy

Toolbox for analysis of electron backscatter diffraction (EBSD) patterns
https://kikuchipy.org
GNU General Public License v3.0
79 stars 30 forks source link

Projection of EMsoft master patterns from stereographic to Lambert projection struggles with equator #542

Open hakonanes opened 2 years ago

hakonanes commented 2 years ago

The projection of an EMsoft master pattern in the stereographic projection to the Lambert projection gives incorrect intensities from vectors on the equator. The below image table shows Lambert projection generated with kikuchipy from an EMsoft master pattern in the stereographic projection in the first column, and a Lambert master pattern created directly in EMsoft (not going from the stereographic projection) in the second column. The second row shows the upper left corner from both master patterns.

kikuchipy EMsoft
lambert_kp lambert_emsoft
lambert_kp_edge lambert_emsoft_edge

The blacke edge pixels produced with kikuchipy is a result of the EMsoft master pattern having 0-intensities outside the equator, which are included in most of the edge pixels in the bi-quadratic interpolation of vector intensities on the equator. I don't know to solve this.