Creating high-contrast optical mask?

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SUMMARY

The discussion centers on creating a high-contrast optical mask for a 3D face scanner project utilizing a DLP projector and a camera. The user has printed a binary black/opaque pattern on a transparent sheet, but it fails to block transmitted light effectively. Recommendations include using a metal vapor-deposited mask, which involves depositing a thick metal foil onto a sheet to achieve complete light blockage. This method ensures that the black areas of the mask are truly opaque, enhancing the quality of the projected pattern.

PREREQUISITES
  • Understanding of structured light 3D scanning techniques
  • Familiarity with DLP (Digital Light Processing) technology
  • Knowledge of optical mask materials and properties
  • Experience with metal vapor deposition processes
NEXT STEPS
  • Research metal vapor deposition techniques for optical applications
  • Explore commercial products for high-contrast optical masks
  • Learn about the properties of materials used in optical masking
  • Investigate improvements in DLP projector technology for enhanced performance
USEFUL FOR

This discussion is beneficial for optical engineers, 3D scanning developers, and researchers focused on improving projection techniques and optical mask design.

papaborat
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I hope this is the right forum; if not, I apologize in advance. I'm working on a 3d face scanner project, where I have a camera and a DLP projector very close to each other. This wikipedia entry titled "Structured Light 3D Scanner" explains very well what I'm trying to do.
Basically, I take a picture of the face and within 100ms take another picture but with a projected binary (stripes) pattern (using an optical mask).
The DLP projector has a visible light filter attached, so only near IR light is transmitted.
What I have done is printed a binary black/opaque pattern onto a transparent sheet. However, the black does not completely block the transmitted light.
Hence, I was wondering whether there is a chemical substance with which I can create a high-contrast optical mask (so the black is really black)? Or does anybody know of any commercial products? Thanks!
 
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I would suggest a metal vapor-deposited mask. A thick enough metal foil deposited onto a sheet will block all of the light.
 

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