Calibration

Accurate and quantitative 4D-STEM imaging requires meticulous calibration. 4D-Explorer includes four main steps for calibrating 4D-STEM datasets:

1. Refinement of Experimental Parameters: Adjust general, microscope, camera, space, and aberration parameters.

2. Background Noise Removal: Utilize methods like subtracting a reference background image or pixel histogram filtering.

3. Rotational Correction: Ensure proper alignment of the scan.

4. Diffraction Alignment: Correct diffraction shifts and wobbles using manual measurement, reference datasets, or FDDNet models.

These steps ensure high-quality data processing and analysis.

Calibration

• Edit Parameters
  • General Parameters
  • Microscope Parameters
  • Camera Parameters
  • Space Parameters
  • Aberration Coefficients
• Background Subtraction
  • Pixel Histogram Filter Method
  • Subtract Reference Method
• Rotational Correction
  • Defocused Axial BF Method
  • Center of Mass (CoM) Curl Method
  • Additional 180° Rotation of Diffraction Image
  • Axis Flip
• Diffraction Alignment
  • Using FDDNet Model to Measure Diffraction Shift
  • Manual Measurement of Diffraction Disc Shift
  • Using a Reference Dataset