The standard approach in a two-dimensional analysis is for the camera to remain stationary as the performer moves through the field of view. This enables the movement of the performer to be determined easily relative to an external frame of reference. Two-dimensional filming techniques involving panning or tracking cameras have been used when the performance occurs over a long path. As these methods involve the camera moving relative to the external frame of reference, mathematical corrections have to be made for this movement if accurate two-dimensional co-ordinates are to be obtained.
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Maximise the camera-to-subject distance
The camera must be positioned as far as is practically possible from the performer. This will reduce the perspective error that results from movement outside the plane of performance (see Figure 2.2). A telephoto zoom lens will enable the camera-to-subject distance to be increased whilst maintaining the desired image size. Note that image quality will be reduced if a digital video camera is positioned beyond the limit of its optical zoom system.
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Maximise the image size
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To increase the accuracy during digitising, the image of the performer must be as large as possible. Image size is inversely proportional to the field of view of the camera. The camera should therefore only be zoomed out sufficiently for the field of view to encompass the performance path, plus a small margin for error. For events that occur over long performance paths, e.g. triple jump, a single stationary camera would not provide an image size suitable for quantitative analysis. In such situations, the use of multiple synchronised cameras, or a panning/tracking camera method, would be required.
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