Introduction to Motion Video Analysis

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Introduction to Motion Video Analysis

• LEE Kai-chiu
• Seconded Teacher
• PE SECTION, CDI
• 08 Jan, 2008

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Installation Process

1. Download the software from the following link
   http//www.hk-phy.org/mvas/

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Installation Process

1. Extract the zip file into a single folder.

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Using the MVA software (MVA.exe) A quick guide

• Open a new project
• Choose Open Video to start a new project

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• The video file format allowed is mpeg (.mpeg or
  .mpg) or avi (with the appropriate codec
  installed in the computer). Choose the video file
  to be opened.

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• Choose horizontal, vertical or 2 dimensional
• Click OK after choosing the type of motion.

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• Input Reference Data
• Click OK on the dialog box and click on a point
  on the video screen to specify where you want to
  place the coordinate origin.

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After you have marked the origin, the Reference
Distance dialog box will appear.
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After marking the two points on the video screen,
a yellow line joining the two marked points will
appear. A Reference Distance input dialog box
will also appear.
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1. In the top space, input the mass of the moving
   object captured in the video. In the bottom
   space, input the number of frames you want the
   video to step forward each time you capture a
   position data point on the video screen.

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• Setting Starting Frame and Ending Frame
• To decide the frames to start and end the motion
  data capture, using the scrollbar (or the step
  forward/ backward buttons on the two sides of the
  scrollbar).

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• Capturing Motion Data Points on Video
• On the video screen, click on the position of the
  moving object on the video screen in each frame
  step to capture the motion data points.

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• Check the Show Axis and Show All Points check
  boxes, and then click on the Apply button to
  display the axes and data points.

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• Curve Fitting and Graph Plotting Using Plot Panel
  
• Click on the No. of Sections pull down menu and
  choose 1, 2 or 3 sections to be fitted.

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• Click on the Fitting Methods pull down menu and
  choose the type of polynomial fitting you want to
  do on the motion data.

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1. Click on the Plot Velocity Graph, Plot
   Acceleration Graph or Plot Energy Graph pull down
   menus and choose the graph you want to plot.

Best Fit Line
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Save Project The Save Project button saves the
project information into two files, namely, the
filename.mva file and the filename_setting.txt
file.
The filename.mva file saves information including
the reference length, coordinate axes and data
points etc. The filename_setting.txt file saves
information about curve fitting and will exist
only if you have used the Plot Panel (for graph
plotting or polynomial fitting) in the project.
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Further Investigation

• Measure the starting angle in the Crouch Start
• Measure the upper body upright rate in 20/30m
• Different field events with 2 dimensions.
• The speed of athletes during take-over
• (with your creative thinking)

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THANK YOU