Freshman Imaging Project 2010-11
Polynomial Texture Maps (PTMs)
• Pioneered by Tom Malzbender of HP Labs in 2001
• Displays an object so the user can control where the light is
coming from
o By viewing an object from different angles of illumination,
surface textures become more visible.
• Currently, there are many applications of PTMs
PTM Process
• HP Labs' software:
o PTMFitter
o PTMViewer
Light source 1
• Pixel colors can be
represented numerically
• There is a mathematical
relationship between pixel
color and illumination angle
• Knowing color at several
angles allows us to predict
color at all angles
1
Light source
2
2
PTM Fitter and Viewer
PTM Fitter
• Creates a models of the variations in color at each
pixel
o Biquadratic polynomials (6 coefficients)
o Minimum of 6 images
PTM Viewer
• Reconstructs lighting angles based on fitted curves
Our Project Goal
• Create a basic white light PTM dome by the end of Winter
quarter
• Create a PTM device using multiple wavelengths of light
o Not exclusively white light
What We Have Accomplished
- Proof of Concept
Prototype and Miniature
-Research and
Understanding of PTM
devices
-includes contacts
-Created work groups
including software,
camera,
illumination/electrical,
and structure.
Software Group
Accomplishments
• Identification and Investigation of LabVIEW software
• Understanding of use and benefits of B-Splines
• Identification of needed user inputs and outputs
• Have begun to program software and design userinterface
Camera Group
Accomplishments:
• Have identified the Camera for basic PTM dome based
on research of possible camera specs
• Have learned about the Tone Transfer Function
• Have begun to learn about Modulation Transfer
Function
Chosen Camera:
Nikon D50
Illumination/Electrical Group
Accomplishments:
• Have ordered and
tested lights including
LEDs, Solux, and
incandescent
• Have learned how to
characterize light by
luminance, radiance, etc.
Structure Group
Accomplishments:
• Have orderd a dome for our basic white-light PTM based
off of our system requirements
• Have created a CAD drawing of what our white-light
PTM will look like
• They have got in contact with the machine shop
What We Are Going To Do
• Create a multi-spectral PTM device
• Present our work at the Imagine RIT festival in May
• Hopefully have a few students travel to DC to compare
the PTMs made by our devices to those imaging devices
at the Library of Congress
• Maybe have students continue work on this project over
the summer
Questions?
ife2010.wikispaces.com/
Questions?