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Basic APAS instructions for 2D analysis
VIDEO ACTIVITY
1.
Make certain entire activity will be in the field of view of the camera
2.
Record calibration points
� Must be at least 4 coplanar points
� Points should �encompass� activity to be analyzed
� Activity should take place in same plane as calibration points
CAPTURE VIDEO TO COMPUTER
-
Connect
video camera to computer using DV cable to frame grabber
-
Turn
camera to VTR mode
-
Double
click the STUDIO DV icon to open the capture program
-
Select
the CAPTURE tab and use the VCR buttons to position the videotape.
Make certain that you position the video before the section that you
would like to capture. (Use the file cabinet icon to change the location of
the stored files)
-
Click
the PLAY button to start the video and then click the START CAPTURE button.
At this point you can enter a name for the video file.
-
Enter
the name and select Start Capture.
-
Select
the STOP CAPTURE to stop recording the video to the computer.
-
Perform
the steps listed above for both the Data and the Calibration video.
-
Select
FILE, EXIT to close the program.
TRIM THE VIDEO
-
Double
click the APAS SYSTEM icon and then double click the TRIMMER icon.
-
Click
the AVI icon and select the video DATA file that has been captured.
The video file will open and the individual images will be displayed
in the top panel. Double click
the image to make it full screen. Double click again to return to reduced size.
-
Use
the VCR buttons to position the video to the starting image.
Click the TRIM START icon and the SYNCH icon when the first image is
selected.
-
Click
the PLAY icon to advance the video to the last image.
-
Click
TRIM END when the last image is selected.
-
Select
FILE, SAVE TRIMMING. You will
see the Source file and a field for the Destination file. Enter the name and path for the destination file. NOTE:
If you leave the same name, the original file will be overwritten.
-
Repeat
the steps listed above for the calibration point video file.
-
Select
FILE, EXIT
DIGITIZE VIDEO FILES
-
Double-click
the DIGITIZE icon in the APAS System folder.
-
Select
FILE, NEW PROJECT and enter the path and filename for the analysis.
-
Enter
the Sequence Parameters
Title- This is a label for the activity and for future reference
Units � Used to specify the units for the analysis. This will be used for reporting results.
#Points � Used to specify how many points will be digitized
#Control � Used to specify how many calibration points
TYPE � Leave at System
Height � Subject�s height (in the units specified)
Weight � Subject�s weight
-
Select
the POINT ID�s button to specify the point names. Select OK when done.
-
Select
Control XYZ to enter the calibration coordinates (in units specified).
-
Select
OK from the Sequence Parameters menu to proceed to the View Information
menu.
-
Enter
the View Information
Title � Used to specify information particular to this camera view.
FrameRate � Leave at 60
CameraID � used as optional label
Camera X,Y,Z � Not used
View Type � leave at Stationary
Select OK to proceed
-
Click
the AVI icon to open the video data file.
-
Select
OK at the Video File Information menu.
-
Start
the Digitizing process. The
current point is listed on the lower portion of the screen. All images begin with a �Fixed Point� This is any point in the field of view that DOES NOT MOVE.
Then digitize the points in the order specified.
Proceed image by image until complete.
DIGITIZE CONTROL POINTS
-
Select
CONTROL, DIGITIZE and then CONTROL, OPEN VIDEO, AVI FILE and select the
video calibration file. The
file will be displayed in multi-panel format.
Just select the best image and then click OK.
-
Now
digitize the Fixed Point and the Control Points in the order specified.
-
When
complete, select CONTROL, FINISH.
TRANSFORM/SMOOTH THE DATA
-
Select
the DLT icon from the toolbar to open the Transform Options menu.
-
In
the View tab, select the file to be transformed from the available views.
There will usually only be one view available.
-
Leave
the options in the Transformation and Smooth tabs at the default settings.
-
Click
OK to proceed and then click OK when Filtering has been completed.
ANALYZE THE DATA
-
Click
the ANALYZE icon from the toolbar.
-
Click
the NEW GRAPH icon from the toolbar
-
Click
the FILE button and specify the analyzed file for display.
-
Click
the ADD button to specify the desired parameters.
For example:
Type � Linear
Quantity � Displacement
JointSeg #1 � R.Foot, R.ankle, R.Knee, R.Hip
Joint/Seg#2 � Not used for displacement
Component � X (horizontal) or Y (vertical)
-
Select
OK and then OK to graph the data.
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