Polynomial Texture Mapping for Footwear and Tire Impressions
Technology Transfer Workshop
Workshop Curriculum
Workshop Date: September 5-6, 2007
Team
Workshop Leader
Workshop Instructors:
Name
John Yoshida
James Hamiel
Contact Information
John.Yoshida@doj.ca.gov
James.hamiel@doj.ca.gov
Workshop Overview:
The purpose of this technology transfer workshop is to provide the student with an
introduction to Polynomial Texture Mapping (PTM). The PTM technology is applied to
footwear and tire track impression evidence. The class will include lecture,
demonstration, and laboratory exercises for the student to learn about the use of PTM
technology to footwear and tire track impression comparisons.
The theory and application of Polynomial Texture Mapping will be discussed and practical
applications will be demonstrated. The various PTM components will be discussed
including the building of a PTM dome, camera/lens selection and PTM files. Various
samples will be used to demonstrate this technique including casts, impressions in blood
and other matrices.
The student will build their own PTM files and utilize the PTM software to practice the
different modes used in analyzing impressions with the PTM software. The student will
be given the tools to build their own PTM files.
Learning Outcomes:
At the completion of the Polynomial Texture Mapping for Footwear and Tire Impressions
Technology Transfer Workshop, the participant will acquire the knowledge to:
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Understand the basic theory and applications of Polynomial Texture Mapping
Gain the knowledge to select the proper digital camera/lens for shoe/tire impression
documentation
Understand the minimum requirements for building a PTM dome
Understand the PTM application as applied to shoe and tire track impression evidence
Understand the step-by-step process used in building a PTM file from a collection of
digital images
Be able to navigate the PTM software to bring out different detail in a captured
impression
Understand the different PTM modes for image enhancement
Evaluate the PTM method vs. “traditional” impression comparisons
Summarize the PTM method for impression comparisons
Polynomial Texture Mapping Workshop Outline– Day 1
Time
8:30 – 9:00
Topic
Introduction of staff
Instructor(s)
John Yoshida
9:00 – 10:00
Background and Theory of Polynomial Texture
Mapping
10:00 – 10:30
10:30 -11:30
Break
PTM files and Demonstration of PTM files
James Hamiel
11:30 – 12:00
Instructions for Laboratory Exercises
James Hamiel
12:00 – 1:00
1:00 – 3:00
Lunch
Laboratory Exercises
3:00 – 3:30
3:00 – 4:30
Break
Laboratory Exercises (continued)
4:30 – 5:00
Review of Laboratory Exercises
John Yoshida
James Hamiel and John
Yoshida
James Hamiel and John
Yoshida
James Hamiel and John
Yoshida
Polynomial Texture Mapping Workshop Outline– Day 2
Time
8:30 – 9:30
Topic
Review of Laboratory Exercises (continued)
930 – 10:00
Building a PTM Dome
Instructor(s)
James Hamiel and John
Yoshida
James Hamiel
10:00 – 10:30
10:30-11:00
Break
Building a PTM Dome (continued)
James Hamiel
11:00 – 12:00
Camera/lens evaluation/selection
12:00 – 1:00
1:00 – 2:00
Lunch
Discussion of the Laboratory data and comparison
to “traditional images
James Hamiel and John
Yoshida
2:00 – 2:30
Admissibility in Court
John Yoshida
2:30
Class Over
James Hamiel and John
Yoshida