Video Based Motion Video Based Motion Analysis Analysis Tetyana Antimirova and Marina Milner-Bolotin, Tetyana Antimirova and Marina Milner-Bolotin, Department of Physics Department of Physics Faculty of Engineering, Architecture and Faculty of Engineering, Architecture and Science Science Ryerson University Ryerson University OAPT Conference, May 22-24, 2008 OAPT Conference, May 22-24, 2008 Ryerson University, Toronto Ryerson University, Toronto
Transcript
Video Based Motion Video Based Motion AnalysisAnalysis
Tetyana Antimirova and Marina Milner-Tetyana Antimirova and Marina Milner-Bolotin, Bolotin,
Department of PhysicsDepartment of PhysicsFaculty of Engineering, Architecture and Faculty of Engineering, Architecture and
ScienceScienceRyerson UniversityRyerson University
OAPT Conference, May 22-24, 2008OAPT Conference, May 22-24, 2008Ryerson University, TorontoRyerson University, Toronto
WHAT IS VIDEO-BASED MOTION WHAT IS VIDEO-BASED MOTION ANALYSYS?ANALYSYS?
In Motion Video Analysis, experimental In Motion Video Analysis, experimental demonstrations or real-life events involving demonstrations or real-life events involving motion (roller-coaster rides, car race, sports motion (roller-coaster rides, car race, sports events, objects falling, etc.) are recorded on events, objects falling, etc.) are recorded on videos and later analyzed using Logger Pro or videos and later analyzed using Logger Pro or VideoPoint softwareVideoPoint software
The position data are collected from each time The position data are collected from each time frame frame
Positions of objects in the video frame can be Positions of objects in the video frame can be measured by pointing a mouse and clicking.measured by pointing a mouse and clicking.
The data generated can be graphed, analyzed in The data generated can be graphed, analyzed in spreadsheets, compared to theoretical models. spreadsheets, compared to theoretical models.
ADVANTAGESADVANTAGES
Demonstrates real event (as opposed to Demonstrates real event (as opposed to idealized textbook end-of-chapter questions)idealized textbook end-of-chapter questions)
The data for problems/modeling come from The data for problems/modeling come from the experiment the experiment
A Video Analysis mini-project presents a A Video Analysis mini-project presents a feasible cost effective alternative to live feasible cost effective alternative to live experiments. experiments.
Tetyana’s first Tetyana’s first attempt at motion attempt at motion video analysis at video analysis at summer Activity-summer Activity-Based Physics Based Physics Faculty Institute Faculty Institute (ABPFI),(ABPFI),
Dickinson College,Dickinson College,
Carlisle, Carlisle, Pennsylvania, June Pennsylvania, June 20072007
EXAMPLESEXAMPLES
Cart Going Forth and Cart Going Forth and BackBack
Cart Going Forth and Cart Going Forth and BackBack
InclineIncline
Free FallFree Fall
VIDEO FROM “CONTEMPORARY VIDEO FROM “CONTEMPORARY GALILEO’SGALILEO’S
PROJECTILE” HOMEWORK PROJECTILE” HOMEWORK((Courtesy of Activity Based Physics Group)Courtesy of Activity Based Physics Group)
TWO-TRACKS DEMO FROM ONTARIO TWO-TRACKS DEMO FROM ONTARIO SCIENCE CENTRESCIENCE CENTRE
Question: TwoQuestion: Two
metal balls aremetal balls are
released from released from thethe
the top point the top point
simultaneously.simultaneously.
Which one willWhich one will
finish first?finish first?
HOMEWORKHOMEWORK
Some of the traditional end-of-Some of the traditional end-of-chapter problems can be converted chapter problems can be converted into motion video analysis problemsinto motion video analysis problems
Additional benefit: comparison of Additional benefit: comparison of analytical solutions (whenever analytical solutions (whenever possible) with numerical possible) with numerical solutions/modeling using real data solutions/modeling using real data
MANY STUDENTS FAIL TO RECOGNISE THE MANY STUDENTS FAIL TO RECOGNISE THE SIMILARITIES SIMILARITIES
BETWEEN THESE SITUATIONSBETWEEN THESE SITUATIONS
TRADITIONAL END-OF-CHAPTER TRADITIONAL END-OF-CHAPTER PROBLEMPROBLEM
A package is dropped from the plane which is flying with a A package is dropped from the plane which is flying with a constant horizontal velocity of constant horizontal velocity of VaVa=150 ft/s. Determine the =150 ft/s. Determine the normal and tangential components of acceleration, and the normal and tangential components of acceleration, and the radius of curvature of the path of motion just before the radius of curvature of the path of motion just before the package strikes the ground R.C Hibbeler, (2006), package strikes the ground R.C Hibbeler, (2006), “Engineering Mechanics”, Pearson“Engineering Mechanics”, Pearson
PROBLEM EXAMPLEPROBLEM EXAMPLE
Based on what you know about curvilinear Based on what you know about curvilinear motion, calculate the rate of increase of speed motion, calculate the rate of increase of speed for the third last point of the trajectory for the third last point of the trajectory (t=0.917). Whenever possible, use real data (t=0.917). Whenever possible, use real data from the movie.from the movie.
(was offered as a supplement to the ABP’s (was offered as a supplement to the ABP’s “Galileo’s Projectile II: Using Contemporary “Galileo’s Projectile II: Using Contemporary Techniques” assignment)Techniques” assignment)
THE PROJECTILE PATH THE PROJECTILE PATH TRACEDTRACED
