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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 fromo 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 PTMFittero PTMViewer
Light source 1
Light source 2
1
2
• 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
PTM Fitter and Viewer
PTM Fitter• Creates a models of the variations in color at each
pixelo 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 user-interface
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 tocharacterize light by luminance, radiance, etc.
Structure GroupAccomplishments: • 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?
Questions? ife2010.wikispaces.com/