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The development and validation of a ...

Scheirman, Gerald Lee.

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The development and validation of a rotating camera method for assessing human movement in three dimensions.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The development and validation of a rotating camera method for assessing human movement in three dimensions./
Author:	Scheirman, Gerald Lee.
Description:	113 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-07, Section: B, page: 3152.
Contained By:	Dissertation Abstracts International60-07B.
Subject:	Biophysics, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9938055
ISBN:	0599393513

The development and validation of a rotating camera method for assessing human movement in three dimensions.
Scheirman, Gerald Lee.

The development and validation of a rotating camera method for assessing human movement in three dimensions. - 113 p.

Source: Dissertation Abstracts International, Volume: 60-07, Section: B, page: 3152.

Thesis (Ph.D.)--The Pennsylvania State University, 1999.

A novel method was developed to quantify gross human movement from two rotating video cameras. Specialized tripod heads were manufactured which contained optical encoders to sense the pan and tilt angles of the cameras. These angles were overlaid onto the video image using another custom developed video overlay unit. Once the video images were captured into a computer, custom software would decode the angular information and store it with the coordinates of the points of interest digitized from the image. An original calibration procedure was developed to compute the camera parameters necessary for the three-dimensional reconstruction. The procedure required that at least two rods be placed vertically near the activity. This was particularly useful for biomechanics because it did not demand specially sized calibration frames. Lastly, algorithms were developed to compute three-dimensional coordinates of points on the subject.

ISBN: 0599393513Subjects--Topical Terms:

1019105
Biophysics, General.

The development and validation of a rotating camera method for assessing human movement in three dimensions.
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100 1 $a Scheirman, Gerald Lee. $3 1931264
245 1 4 $a The development and validation of a rotating camera method for assessing human movement in three dimensions.
300 $a 113 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-07, Section: B, page: 3152.
500 $a Adviser: Richard C. Nelson.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 1999.
520 $a A novel method was developed to quantify gross human movement from two rotating video cameras. Specialized tripod heads were manufactured which contained optical encoders to sense the pan and tilt angles of the cameras. These angles were overlaid onto the video image using another custom developed video overlay unit. Once the video images were captured into a computer, custom software would decode the angular information and store it with the coordinates of the points of interest digitized from the image. An original calibration procedure was developed to compute the camera parameters necessary for the three-dimensional reconstruction. The procedure required that at least two rods be placed vertically near the activity. This was particularly useful for biomechanics because it did not demand specially sized calibration frames. Lastly, algorithms were developed to compute three-dimensional coordinates of points on the subject.
520 $a A theoretical assessment of the effect of operator error from digitizing was conducted. Results established that there were non-linear relationships between the spatial error and the angle from the camera to the point and between the spatial error and the distance between the camera and the point of interest. In addition, spatial error was proportional to the field of view of the camera and inter-camera distance.
520 $a A performance assessment was completed under static and dynamic conditions. The static test revealed that the precision of the system was 0.17% of the diagonal length of the analyzed space and its accuracy was +/-0.8%. Results from a dynamic performance assessment demonstrated that measurement errors did not increase as the cameras were rotated, as long as the motion remained between the camera locations.
520 $a A practical validation of the method was performed with an assessment of the approach phase of the long jump during competition. The distance from the takeoff board and average velocity was computed from three jumps of three athletes. Results showed that this method was superior to previously employed techniques. The method was sufficiently accurate, the set up and digitizing times were shorter, and because 3-D coordinates were acquired, increased information concerning the biomechanical characteristics of human performance may be obtained.
590 $a School code: 0176.
650 4 $a Biophysics, General. $3 1019105
650 4 $a Engineering, Biomedical. $3 1017684
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710 2 0 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 60-07B.
790 1 0 $a Nelson, Richard C., $e advisor
790 $a 0176
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9938055