Fig. 4: End-to-end preprocessing of experimental 4D-STEM data using 4D-PreNet.
From: A Unified preprocessing framework for high-throughput diffraction pattern analysis
a Representative diffraction patterns from amorphous, crystal, and mixed regions. b Center calibration results before and after calibration, with improved beam alignment across amorphous, crystal, and mixed regions. The right panels display the corresponding X and Y shift maps, showing reduced spatial drift after calibration. c Ellipse calibration applied to averaged diffraction patterns. Both the average and polar-transformed profiles demonstrate improved circularity of diffraction rings, confirming effective calibration of elliptic distortion.