Comparison of Film and Video Techniques for Estimating Three-Dimensional Coordinates within a Large Field

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Rosa M. Angulo
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Jesús Dapena
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This study compared the errors produced with 3-D video and film analysis techniques using the DLT method with fixed cameras when the images cover a wide field of view. The results indicated that with a large field of view (8 meters) the accuracy of video analysis is clearly inferior to that of film analysis. However, within the volume of the control object, both film and video analyses are still precise enough for most practical purposes. Errors were larger in landmarks outside the control object than in the points of the control object. The maximum errors in the calculated positions of external landmarks were particularly large in the video analysis. However, even these rather large errors for points markedly outside the control object may be acceptable. It will depend on the requirements of each particular investigation.

Rosa M. Angulo, formerly a graduate student at Indiana University, is with the Departament de Biomecanica, Centre d’Alt Rendiment, Apartado de Correos 129, Sant Cugat, 08190 Barcelona, Spain. Jesús Dapena is with the Department of Kinesiology, Indiana University, Bloomington, IN 47405.

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