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/