20130321080339VideoTechnologyandCoaching Ong
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Transcript of 20130321080339VideoTechnologyandCoaching Ong
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Video Technology and Coaching
Centre for Biomechanics
Faculty of Sport Science
Ong Kuan Boon Ph.D
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Presen tat ion Out l ine What? Video Technology is used
Why? We use Video in Coaching
How? We use the technology
- Qualitative Analysis- Quantitative Analysis
Summary and The Future
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What Video Technology is Used
Videodigital recording (vs analogue PAL, NTSC)DV vs VCD, DVD, HDV, AVCHD
Camcorders, CamerasVideo qualityShutter speed, frame rateCameras types
Computer control
Capture and displayData base and analysis
Telemetry, the Internet
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What Video Technology is Used
Videodigital recording (vs analogue PAL, NTSC)
Camcorders, Cameras
Video quality
3CCD DVHigh shutter speed vs high frame rateSpecial purpose camerasFirewire vs CameraLink vs Ethernet
Computer controlCapture and displayData base and analysis
Remote - Telemetry, the Internet
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What Video Technology is Used
Videodigital recording (vs analogue PAL, NTSC)
Camcorders, CamerasVideo quality
Shutter speed, frame rateCameras types
Computer controlCapture and display
Multiple screen displayDrawing, measurement, motion tracking
Video data base vs analysisGeneral vs Sport Specific software
Remote - Telemetry, the Internet Web Servers
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Why We Use Video in Coaching
Images can help the coach convince theathlete about needed technique corrections
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Why We Use Video (continued)
Can present images the coach could never see
High shutter speeds Stop motion
High frame rates provide more images
Computer control to compare images
Video gives the coach an extra tool when
working with the athlete
Coach can review and analyse the performance
after the event
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Why We Use Video (continued)
Can put the camera where the coach cant go
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How We Use the Technology
From a sports biomechanics perspective
to identify and correct faults in skill executionusing a minimum of measurements= Qualitative Video Analysis
Describing and explaining performance skillsusing measurement systems in biomechanics
= Quantitative Video Analysis
To improve performance and reduce injury risk
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Qualitative Video Analysis
The Process:
Match Analysis- to identify players skillsproblem areas
Skill Analysis - to assess and makechanges to technique
Training Applications - to providefeedback to coach and athlete in training
Presentation - to coaches and athletes ofvideo and analysis reports from training orcompetition
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Match Analysis:Preventing Tackle Injuries
in Womens Hockey
Purposes
To identify player actions in the tackle
situations that are associated with injury.
To make recommendations to prevent
injuries occurring in tackles.
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Methods
Analysed video footage of 18 games of the2002 Champions Trophy in Macau
Used SportsCode Pro software and codedplayer actions identified as occurring intackles
Coded actions in injury tackles and intackles
for which there was no injury associated
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Results
174 tackles were observed per game
75 % of all on-field injuries occurred intackles
The injury rate was 1/100 tackles
Tackler more likely to get injured thandribbler
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Actions associated with
increased tackle injury risk Contact with another player or the
ground
Open dribble (speed?)
Side stepping into
path of other player
The stick being swunginto the tackle
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Desirable (safer) tackles
Side-on tackleReverse-stick tackle
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High injury risk tackles
Dive tackle
Front-on (contact) tackle
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Qualitative Video Analysis
The Process:
Match Analysis- to identify players skillsproblem areas
Skill Analysis - to assess and make changesto technique
Training Applications - to provide feedback
to coach and athlete in training Presentation - to coaches and athletes of
video and analysis reports from training orcompetition
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Qualitative Skill Analysis
Determine what to observe and how to observe
Observe the performance
Assess the performance and identify faults
Evaluate faults based on biomechanics principles
Instruct the performer / coach
F ive steps involved!
Adapted from Hay and Reid
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Skill Analysis 1.What to observe?
MODEL -Factors affecting performanceHockey push out
TRAP
(in least time)
SPEED DIRECTION
FORCES TIME STANCE BALANCE
NUMBER
OF SEGMENTS
RADIUS
OF ROTATION
ARM EXTENSION TRUNK LEAN
HEAD POSITION FOOT PLACING
CG HEIGHTTRUNK POSITION
(OPEN/CLOSED)
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Qualitative Skill Analysis
Determine what to observe and how to observe
Observe the performance
Assess the performance and identify faults
Evaluate faults based on biomechanics principles
Instruct the performer / coachAdapted from Hay and Reid
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Skill AnalysisObserve the Performance
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Qualitative Video Analysis
The Process:
Match Analysis- to identify players skillsproblem areas
Skill Analysis - to assess and make changesto technique
Training Applications - to provide feedback
to coach and athlete in training Presentation - to coaches and athletes of
video and analysis reports from training orcompetition
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Training Application
Instantfeedback
Players canwork ontheir skillsself monitor
SoftwareSC WARP
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Qualitative Video Analysis
The Process:
Match Analysis- to identify players skillsproblem areas
Skill Analysis - to assess and make changesto technique
Training Applications - to provide feedback
to coach and athlete in training Presentation - to coaches and athletes ofvideo and analysis reports from training orcompetition
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Expert System Input
siliconCOACHreportPAC
Centralisedreports
Track over time,monitorimprovement.
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Standardised Reports
Project Modified Date Wizard Analyst Client
Bike Fitting Test 2006-04-07 Dialed in Motion: Road Barry Wilson Nick Flyger
Aspect Title:Seat height
Exemplar: Client's Image:
The seat height is set relative to the bottom bracket and pedal when the pedal is
vertical. When the foot is at an angle of 10 degrees, the knee should be between 141
to 145 degrees when measured down the back of the leg.
mailto:[email protected]:[email protected] -
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Quantitative Video Analysis
The Process:
Decide what to measure
Video the skill
Video digitisingmanual or automated.
to measure point locations off video image
Mathematical Analysis
to determine variables of interesta-priori
models Presentation to Coaches and Athletes
To describe and explain motion
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Quantitative Video Analysis
Hockey Drag Flick: What to Measure?
Hockey Hit
NUMBER
OF SEGMENTS
EXTENSION
OF ARMS
TRUNK
LEAN
RADIUS
OF ROTATION
FORCES TIME
SPEED
STANCE
FOOT PLACING CG HEIGHT
BALANCE
DIRECTION DECEPTION
GOAL
Hockey Drag Flick
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Hockey Drag Flick - 3D Study Three cameras at approx right angles
Rear view - focus on the drag flick
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Measurement
Kinematic and temporalvariables at key points:
(a) At right foot contact
with the ground
(b) At stick contact with
the ball
(c) At left foot contact with
the ground(d) At ball release off face
of stick
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Presentation to coach
If A picture is worth a thousand wordsHow much is a video worth?
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Selected Drag Flick comparisons
Variable
Mean
(SD)
Malaysia,
N=5
Pakistan
N=4
Australia
N=2 N=3
Argentina
N=5
Total drag
time s
0.32
(0.07)
0.37
(0.03)
0.30
(0.01)
0.30
(0.02)
0.56
(0.06)
Drag distance
m
0.67
(0.42)
1.27
(0.11)
1.23
(0.04)
1.60
(0.36)
1.00
(0.19)Ball Velocity
m/s
23.0
(1.4)
27.8
(3.8)
24.0
(0.3)
28.2
(3.0)
19.6
(3.6)
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-0.5 m 0.25 m 1.0m
Example drag-flick: 1.75m drag, 1.25 m step
length, contact and release distances, 27m/s speed.
9 m/s 27 m/s
Stop Release
1.25m
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SummaryWe have considered: What video technology is used
- To give the coach something extra
Why we use video in coaching- Improve performance and injury prevention
How we use the technology
Qualitative Match Analysis, skill analysis,
video feedback, presentationsQuantitative Analysis
Measurement and description
-Systematic approaches and fast feedback
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The Fu tu re?
Common use of high speed video
Auto-coding of video in performance
analysis
Video real-time skill analysis and coach
feedback
Video linked to real-time animation
Badminton A tomatic match anal sis
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BadmintonAutomatic match analysis
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Swim speed, stroke length and frequency in real time
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Video plus animation in real time
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Thank you
for your attention
Acknowledgements: My colleagues at ISN for
their critical comments and video clips.