SEM-microphotogrammetry, a new take on an old method for generating high-resolution 3D models from SEM images

Area of Science:

• Materials Science
• Microscopy
• Geology

Background:

• Traditional 3D reconstruction methods often lack the resolution required for nanoscale features.
• Generating accurate 3D models of microscopic specimens can be challenging and time-consuming.

Purpose of the Study:

• To develop a novel method for creating high-resolution 3D surface models from scanning electron microscope (SEM) images.
• To demonstrate the utility of this technique for analyzing micro- and nanoscale features and for public outreach.

Main Methods:

• Utilizing a programmed scanning electron microscope (SEM) to automatically capture multiple images at various angles.
• Employing photogrammetry software, typically used for digital single-lens reflex (DSLR) cameras, to reconstruct 3D models from SEM images.
• Exporting reconstructed 3D models as polygon meshes for potential 3D printing.

Main Results:

• Successful generation of accurate, detailed 3D surface models with micron-scale resolution from SEM images.
• Demonstrated feasibility of using standard photogrammetry software for SEM-based 3D reconstruction.
• Potential for reconstructing extremely small features like diatoms, butterfly scales, and mineral fabrics at nanometre resolution.

Conclusions:

• The presented technique offers a powerful new tool for understanding spatial relationships at very high resolutions.
• This method facilitates the creation of tangible 3D models for scientific study and educational outreach, particularly for visually impaired audiences.