Portable BRDF Probe Development

1
Portable BRDF Probe Development

• Kyle Foster
• kaf3496_at_rit.edu
• Chester F. Carlson Center for Imaging Science
• Rochester Institute of Technology
• Rochester, NY
• May 11, 2007

2
Overview

• BRDF primer
• Probe design
• Project details
• Resources
• Budgeting
• Questions

DIRS Laboratory
3
What is BRDF?

• Bidirectional Reflectance Distribution Function
• Function of four angles
• Part specular, part diffuse

4
How is BRDF measured?

• Mechanical Methods
• Move source
• Move detector
• Very time-consuming
• Accuracy issues
• Optical Methods
• Total subject illumination
• New method
• Jefferson Han Ken Perlin, NYU

5
What is the new method?

• Kaleidoscope optics

Han, J., Perlin, K. Measuring Bidirectional
Texture Reflectance with a Kaleidoscope.
Computer Graphics 36.3 (2003) 741.
6
Project Specifics

• Advisor Dr. Carl Salvaggio
• Development project
• Prototype to final
• Team effort
• Mechanical Engineering
• Electrical Engineering
• Software Engineering
• System Engineering (Imaging Science)

7
Physical Resources

• Prototype Components
• Optical components (100)
• Digital projector (300 - 500)
• Bly cell (cost uncertain)
• Detector system (500 - 2000)
• Silicon
• InGaS
• Assorted linkages tools (200)
• Total Prototype Cost 1100 - 2800
• Estimated Final Cost 5000

8
Locational Resources

• Laboratory Facilities
• light trap lab
• Spacious for meetings
• Suitable computers
• Optics bench
• BRDF Lab (CIS 3rd Floor)

9
Time Budget

• Two-quarter project
• Four credit hours each
• Research ahead of time
• Fourteen man-quarters
• Weeks 1 - 2
• Prototype design
• Parts acquisition
• Week 3
• Prototype construction

10
Time Budget

• Weeks 4 5
• Prototype testing
• Design modification refinement
• Start of software writing
• Weeks 6 8
• Prototype characterization
• Design finalization
• Weeks 9 - 12
• Final component acquisition
• Probe Fabrication

11
Time Budget

• Weeks 13 14
• Software testing
• Probe characterization
• Week 15
• Laboratory testing
• Week 16
• Field testing
• Weeks 17 20
• Formal SOE SOP writeup
• Process writeup review

12
Questions?

• Kyle Foster
• kaf3496_at_rit.edu
• Carl Salvaggio
• salvaggio_at_cis.rit.edu

Han, J., Perlin, K. Measuring Bidirectional
Texture Reflectance with a Kaleidoscope.
Computer Graphics 36.3 (2003) 741.