dc.creatorLeite de Barros, Ricardo Machado
dc.creatorGuedes Russomanno, Tiago
dc.creatorBrenzikofer, René
dc.creatorJovino Figueroa, Pascual
dc.date2006
dc.date2015-11-27T13:06:17Z
dc.date2015-11-27T13:06:17Z
dc.date.accessioned2018-03-29T01:04:15Z
dc.date.available2018-03-29T01:04:15Z
dc.identifierJournal Of Biomechanics. v. 39, n. 4, p. 776-80, 2006.
dc.identifier0021-9290
dc.identifier10.1016/j.jbiomech.2004.12.025
dc.identifierhttp://www.ncbi.nlm.nih.gov/pubmed/16439248
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/197139
dc.identifier16439248
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1297372
dc.descriptionThis paper proposes and evaluates a novel method for synchronisation of video cameras using the audio band. The method consists in generating and transmitting an audio signal through radio frequency for receivers connected to the microphone input of the cameras and inserting the signal in the audio band. In a software environment, the phase differences among the video signals are calculated and used to interpolate the synchronous 2D projections of the trajectories. The validation of the method was based on: (1) Analysis of the phase difference changes as a function of time of two video signals. (2) Comparison between the values measured with an oscilloscope and by the proposed method. (3) Estimation of the improvement in the accuracy in the measurements of the distance between two markers mounted on a rigid body during movement applying the method. The results showed that the phase difference changes in time slowly (0.150 ms/min) and linearly, even when the same model of cameras are used. The values measured by the proposed method and by oscilloscope showed equivalence (R2=0.998), the root mean square of the difference between the measurements was 0.10 ms and the maximum difference found was 0.31 ms. Applying the new method, the accuracy of the 3D reconstruction had a statistically significant improvement. The accuracy, simplicity and wide applicability of the proposed method constitute the main contributions of this work.
dc.description39
dc.description776-80
dc.languageeng
dc.relationJournal Of Biomechanics
dc.relationJ Biomech
dc.rightsfechado
dc.rights
dc.sourcePubMed
dc.subjectBiomechanical Phenomena
dc.subjectImage Interpretation, Computer-assisted
dc.subjectImaging, Three-dimensional
dc.subjectInformation Storage And Retrieval
dc.subjectPhotography
dc.subjectSignal Processing, Computer-assisted
dc.subjectVideo Recording
dc.titleA Method To Synchronise Video Cameras Using The Audio Band.
dc.typeArtículos de revistas


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