Photometric Stereo

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Photometric Stereo

• Nick Vallidis
• COMP 290 project
• May 3, 2000

2
Outline

• Brief discussion of photometric stereo
• Brief discussion of my oops
• Lots of results (from 4 data sets)

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Photometric Stereo

• We talked about using 2 images in class
• If you use 3 images, theres a closed-form
  solution and you get albedo!

4
Oops!

• Need to have light sources fairly close together
• Dont get any data from a surface whose normal is
  gt90o from the light vector.
• 2 of my light sources were 110o apart...

5
Results

• The following results are from
• synthetic images of a sphere
• real images of a sphere
• real images of a ceramic pot
• real images of a scene with sphere and pot

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Synthetic Sphere Data
Usable Data Mask
Input images
7
Synthetic Sphere Results
Needle Diagram
Albedo
Re-lit
8
Real Sphere Data
Usable Data Mask
Input images
9
Real Sphere Results
Needle Diagram
Albedo
Re-lit
10
Ceramic Pot Data
Usable Data Mask
Input images
11
Ceramic Pot Results
Needle Diagram
Albedo
Re-lit
12
Scene Data
Usable Data Mask
Input images
13
Scene Results
Needle Diagram
Albedo
Re-lit