Craniofacial PhenotyperFreshman Imaging ProjectSean CooperRebecca Klein
What is Imaging Science?
Combination of Physics, Mathematics, Engineering, and Computer Science
Studies technology behind scientific images
Applies this to scientific research
http://www.cis.rit.edu/
MotivationResearching a new way of assessing the difficulty of intubation as opposed to traditional methods
JACK WOJTCZAKURMC
BO HUU OF R RESEARCHER
http://www.cs.rochester.edu/research/vision/people/Bo_Hu/Picture given via email
Our AssignmentBuild a Craniofacial Phenotyper
Take a 3D image of the head
Use 3D image generated to find certain measurements
Asses the difficulty of intubation for a specific patient
What are we Measuring?Distance following the curvature of the face (3DS)
Between 7 points on the face
Also finding the volume of the head
Basic RequirementsAccuracy: Our goal is ± 0.5 mm
Cost: Our goal is $3,000
Speed: 1 to 2 second capture time, quick processing time
Robust: small, will not break easily, can be used in a variety of environments; easy/unnecessary calibration
Causes no harm to the patient
What is 3D capture?
• MAYBE ADD PICTURE? SOMETHING TO FILL IN WHITE SPACE
Methods of Depth Capture
Time of Flight
A laser is pulsed
Distance is measured from the time it takes for the pulse to return
Geometrical
Emitter + Sensor at different positions
Triangulation
Triangulation
SENSOR
LASER
Z
D
Using geometry it is possible to determine depth if you know:
The distance between the sensor and the laser (D)
The angle of incidence (Z)
Point Cloud
An output format of a 3D scanner (.ply)
Creates a collection of spatial coordinates
From this a mesh (.obj) can be created and surface distances along the curvature can be measured
Point cloud bunnyhttp://www.engineeringspecifier.com/public/primages/
pr1200.jpg
Mesh bunnyhttp://www.farfieldtechnology.com/products/toolbox/
pointcloud/bunny1w.jpg
Equipment Surveys
• ADD MORE
FaceGen
September 15, 2011
Kinect
LiDAR
http://www.saic.com/geospatial/images/lidar1.jpg
Structured Light Scanner
DAVID Laser Scanner
http://www.david-laserscanner.com/
PortabilityAccuracy (± .5mm)
Robustness Speed Cost
Kinect
LiDAR(Time of Flight)
Structed Light difficult to calibrate
DAVID Laser Scanner
Line Scanner 20 minute capture
time
Z-Scanner
Modulated Light
C3D
Stereoscopic System
Photometric System
Silhouette
Conoscopic Holography
GoodFairPoor
Schedule
Fall
• Research• Equipment Surveys• Demonstrations of 3D capture • Pugh Analysis (narrowing down to 3 options)
PDR Prelimary Design Review
Winter
Continue with Pugh Analysis• Trade off studies to test different options• Develop a design (by week 7)• Choose final system option(s) and create Work Breakdown Structures for each
CDR Critical Design Review
Spring
• Complete final design• Buy components• Build system(s)• Test system(s)• Have final product for
Extract measurements from point cloud data
Research to understand theories of Software
Coding
Questions?
