Automatic Debye-Scherrer Elliptical Ring Extraction via a Computer Vision Approach

J Synchrotron Radiat. 2018 Mar 1;25(Pt 2):439-450. doi: 10.1107/S1600577518000425. Epub 2018 Feb 21.

Abstract

The accurate calibration of powder diffraction data acquired from area detectors using calibration standards is a crucial step in the data reduction process to attain high-quality one-dimensional patterns. A novel algorithm has been developed for extracting Debye-Scherrer rings automatically using an approach based on computer vision and pattern recognition techniques. The presented technique requires no human intervention and, unlike previous approaches, makes no restrictive assumptions on the diffraction setup and/or rings. It can detect complete rings as well as portions of them, and works on several types of diffraction images with various degrees of ring graininess, textured diffraction patterns and detector tilt with respect to the incoming beam.

Keywords: 2D patterns; calibration; computer vision; powder diffraction.