keynote presentatio - forensic laser scanning by eugene liscio
TRANSCRIPT
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Forensic Laser ScanningEugene Liscio, P. Eng.
Present and Future
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o AI2-3D, Established 2005, Documentation, Analysis and Visualization…
o Professional Engineers Ontario, October 1997
o President of International Association of Forensic & Security Metrology, (IAFSM, www.iafsm.org)
o Adjunct Professor, 3D Forensic Reconstruction Course at the University of Toronto, Mississauga, January 2013
o Research & Validation in “3D Forensics”
o Co-Developer of Clouds2Max plugin for 3ds Max
o FARO Certified Trainer, January 2014
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o AI2-3D, Established 2005, Documentation, Analysis and Visualization…
o Professional Engineers Ontario, October 1997
o President of International Association of Forensic & Security Metrology, (IAFSM, www.iafsm.org)
o Adjunct Professor, 3D Forensic Reconstruction Course at the University of Toronto, Mississauga, January 2013
o Research & Validation in “3D Forensics”
o Co-Developer of Clouds2Max plugin for 3ds Max
o FARO Certified Trainer, January 2014
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o 3D Forensic Reconstructions
o Documentation Technologies
o Laser Scanner Accuracy Issues
o Multi-Modal Approach & Analysis
o Visualization
o Cases
o Admissibility
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Use of computer graphics to accurately represent an
o Object
o Environment
o Process
o Data
o Event.
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Big and Small objects
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A Reconstruction is based on available physical evidence and can be used for analysis or for substantive purposes.
A Recreation is mostly a demonstrative or “creative” work (although it may be based in part on physical data), it may rely on witness testimony or other non-physical sources of data.
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A Reconstruction is based on available physical evidence and can be used for analysis or for substantive purposes.
A Recreation is mostly a demonstrative or “creative” work (although it may be based in part on physical data), it may rely on witness testimony or other non-physical sources of data.
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Measurement/DocumentationDefines the equipment, technology and methods of capture
AnalysisIs the study of captured data and how it can be explored to reveal information that would otherwise be obscure
VisualizationPresentation and delivery of the documentation or analysis in a form that is easily understood
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Typeso Bullet Trajectorieso Suspect Heighto Bloodstainso Comparison Analysiso 3D Deviation Analysiso Time-distance relationshipso Angular measurementso Field of view
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Types
o Plan Drawings/Sketches
o Still Images/Renders
o Animations
o Real-Time Models
o Virtual Tours/Panoramas
o Virtual Environments
o 3D Prints
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Photogrammetry
o Uses a digital camera to capture photographs from varying angles and creates a textured 3D model
Handheld Scanners
o Several companies are offering low cost scanners capable of documenting objects the size of a human body or larger
Laser Scanning
o Uses active source of light energy to “bounce” off a surface and return to a receiver where distance is calculated.
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3D scanners are not so versatile that they can be used on all types of surfaces and in all conditions. Like any piece of equipment, there are applications for which they may not be well suited.
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Dark surfaces absorb light and make it difficult to get a strong reading to the receiver.
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http://hirise.lpl.arizona.edu/HiBlog/tag/spectrum/
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Partial hits on a surface provide multiple returns that are difficult to discern from one another. The result on edges and sharp corners is noise
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Source: http://www.cmlab.csie.ntu.edu.tw/~liubiti/Merge/
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Retexture for better or alternate light spectra
Photos are high resolution
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Temperature may indicate time of death.
May also indicate other evidence at a crime scene
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Use total station as a control to position scans
Use laser scanner on evidence that requires greater detail
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Video records over time
Positions and changes are able to be documented accurately
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Use photogrammetry in hard to reach areas or in places where higher accuracy is required
Photogrammetry & Laser Scanner
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Photogrammetry Examples
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Photogrammetry Examples
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Photogrammetry Examples
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Use to fill in gaps where scanner cannot reach
Handheld & Laser Scanner
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New Uses for Handheld Devices
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Fill In Gaps
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Use to compare changes in point clouds over time
Point Cloud Comparison
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Point Cloud Comparison
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Point Cloud Comparison
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Point Cloud Comparison
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Point Cloud Comparison
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Visualization
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Plan Drawings
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3D Renders
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Animations
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3D Prints
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Webshare2Go
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Virtual Environments
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Cases
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Stabbing Reconstruction
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Stabbing Reconstruction
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Stabbing Reconstruction
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Stabbing Reconstruction
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Stabbing Reconstruction
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Stabbing Reconstruction
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Stabbing Reconstruction
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Stabbing Reconstruction
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Stabbing Reconstruction
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Stabbing Reconstruction
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http://gulliblestravelsdma.wordpress.com/2014/04/25/put-that-gavel-down/
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How are you using the data? o Detailed Analysiso Visualizationo Plan Drawing
Accuracy - Always have reference measurements!
Training and Certification
There are no known cases where laser scanner data has been inadmissible
FARO scanner data has been accepted at trial on many occasions
IAFSM is looking to develop laser scanning guidelines
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Scanner data has been used and demonstrated at trial!
State of Indiana vs. David R. Camm, 74C01-1210-MR-000184Spencer Country Circuit Court, Indiana, USAJudge Name: Johnathan DarttSeptember-October 2013Expert Witness: Eugene Liscio
State of Georgia vs Anthony Johnathan Donald, Criminal Case Number: 13903669 – 42Clerk Superior Court – Cobb County Georgia: Rebecca KeatonJudge Name: GrubbsAugust 2014Expert Witness: David Dustin
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http://ethicsalarms.com/2011/04/07/the-saga-of-the-racist-juror-and-the-angry-judge-chapter-two-never-mind/