Creating high-contrast optical mask?

  • Thread starter papaborat
  • Start date
  • #1
1
0
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!
 

Answers and Replies

  • #2
chemisttree
Science Advisor
Homework Helper
Gold Member
3,521
559
I would suggest a metal vapor-deposited mask. A thick enough metal foil deposited onto a sheet will block all of the light.
 

Related Threads on Creating high-contrast optical mask?

Replies
1
Views
8K
  • Last Post
Replies
17
Views
3K
  • Last Post
Replies
11
Views
3K
  • Last Post
Replies
2
Views
4K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
6
Views
8K
  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
2
Views
36K
Top