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Documentation Summary

Below is a summary of all documentation information, including some tips and tricks to keep in mind when documenting your scene.

Marker placement

  • Use a single overview marker per reconstruction.
  • Make sure detail marker IDs are unique across the whole scene.
  • The orientation of detail markers does not matter.
  • The orientation of the overview could matter, depending on how you plan to position the reconstruction in HemoVision's 3D space.
  • You cannot place too many detail markers; you can place too few.

Camera

  • We recommend using a camera with at least 10 megapixels resolution. Higher resolutions typically lead to sharper images, and allow you take overview images from a greater distance while maintaining good visibility of the markers.
  • Avoid wide-angle or fish-eye lenses because they distort the image too much.
  • You can use the camera of your smartphone to take photographs. Just make sure image resolution and quality are sufficient for stain analysis.

Photography

Overview photographs

  • Take a minimum of 20 overview photographs, varying position while ensuring sufficient overlap.
  • Lock focal length while taking overview photographs.
  • You can mix portrait and landscape orientation between photographs.
  • Avoid mixing photographs from different cameras and/or lenses (although this is supported in HemoVision, it may affect reconstruction accuracy).

Detail photographs

  • Take at least one detail photograph from each detail marker.
  • Center detail markers in detail photographs when possible.
  • Avoid taking detail photographs from very oblique angles.
  • Make sure that all markers visible in a detail photograph lie on the same plane (surface).

General

  • Use diffuse lighting or bounce flash to minimize glare. Poor lighting may hinder marker detection.
  • Ensure sharp focus. Motion blur or bad focus may hinder marker detection.
  • You cannot take too many photographs; you can take too few.
  • Be careful around reflective surfaces/mirrors. Reflections of markers in photographs may hinder proper reconstruction.

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Forentrics - Bringing Evidence into Focus