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A low-cost method for digitizing videotaped continuous movements on the Macintosh |
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| Authors: | Heather J. Barnes Jonathan Vaughan Matthew J. Jorgensen David A. Rosenbaum |
| Affiliation: | 1. Department of Psychology, Tobin Hall, University of Massachusetts at Amherst, 01003, Amherst, MA 2. Department of Psychology, Hamilton College, 13323, Clinton, NY 3. University of Massachusetts, Amherst, Massachusetts |
| Abstract: | We describe an inexpensive means of digitizing videotaped positions of moving points, such as the positions of the joints of a person who is performing an action. Single-frame video images and a Macintosh computer monitor are optically superimposed, using a half-silvered mirror, and the positions of reference points in the video image are manually clicked in by the operator, so that the screen coordinates of the reference points on each frame can be stored in a text file for later analysis. The digitizing program records comments and identifying information along with the position data. |
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