Hands 3D-scanning is an application, which is popular among our clients, since Artec Spider or Space Spider can capture very hi-res details of a human skin and nails. For instance, check this mesh at Sketchfab.
However, some forensics projects require extremely hi-res detailing which includes a recording of the fingerprints 3D-geometry. Let's check, how it should be done.
Before you start scanning:
- A finger itself should be placed in front of a something, for example, a text of a simple business card can be used as an extra texture reference.
- Micro-movements and even a blood pulse under the skin might affect the result, since the Space Spider captures very hi-res data. Therefore, the scanned finger should be kept as immobile as possible.
- In one of our finger scanning projects, we used a piece of tape to stick the business card to the finger, so it is immobile according to the background, while scanning session is performed.
Basically, you adjust "Sensitivity" up to the middle of the scroll, then record 25-30 frames per a finger.
After a raw scan is captured, run global registration in "geometry + texture" mode, then launch sharp fusion with a resolution from 0.1 to 0.3 mm, depending on the amount of 3D details that you need.
We usually create several 3D-meshes with various resolutions. Here are a couple of screenshots from one of our forensics projects:
Note: Full-sized photos are attached to the article.
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