Mr. Peter Wimmer Profile

Peter Wimmer

at 3dtv.at

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Proceedings Article | 5 March 2007 Paper

DV/HDV tape drive synchronization for immediate preview of dual camera recordings

Peter Wimmer

Proceedings Volume 6490, 649013 (2007) https://doi.org/10.1117/12.706321

KEYWORDS: Video, Multiplexers, Cameras, Multiplexing, Clocks, Optical filters, Image analysis, Video compression, Stereoscopic cameras, Image resolution

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Dual DV or HDV camcorder setups are widely used to record stereoscopic video content. However, even when using a remote control to operate the camcorders synchronously, the number of recorded frames per scene is slightly different on the left and right tape. The different lengths make it impossible to play back the recorded content immediately. Up to now, both tapes had to be transferred to a hard disc and edited scene by scene. This paper presents a software-only solution to synchronize a pair of DV or HDV camcorders: Playback is assumed to be out of sync whenever a scene change does not occur at exactly the same time on the left and right tape. In such a case, the first tape is stopped until the scene change occurs on the second tape as well. Once both tapes have reached the scene change, playback on both drives is resumed. Detecting scene changes by means of image analysis is unreliable and CPU intensive. Consequently, we suggest a better method based on the recording date and time embedded in the compressed stream. To test the suggested solution, tape synchronization capabilities have been added to the Stereoscopic Multiplexer, a multiplexing solution for the Microsoft Windows platform.

Proceedings Article | 22 March 2005 Paper

Stereoscopic player and stereoscopic multiplexer: a computer-based system for stereoscopic video playback and recording

Peter Wimmer

Proceedings Volume 5664, (2005) https://doi.org/10.1117/12.585481

KEYWORDS: Video, Cameras, Multiplexers, Wavelength division multiplexing, Computing systems, Digital video discs, Internet, OpenGL, Glasses, RGB color model

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Computer-based solutions are well suited for capturing and playing stereoscopic video content at high quality, because the constraints of TV standards need not be obeyed. We developed an application called Stereoscopic Player to play stereoscopic videos. Based on Microsoft's DirectShow, it can handle all major video sources, codecs, stereoscopic layouts and viewing methods. Usability was an important goal in the application design; several features simplify handling of stereoscopic videos. To free the user from choosing the proper settings, we introduced the concept of stereoscopic information files and an Internet-based service for automatic configuration. The Stereoscopic Multiplexer is a solution to capture stereoscopic content within applications compatible with WDM capture drivers. It takes frames from two 'real' capture devices, synchronizes them and passes the resulting stereo pairs to the application. If the cameras support numerical control of camera parameters, Stereoscopic Multiplexer also synchronizes these parameters. Supporting resolutions up to high definition and a wide range of devices, Stereoscopic Multiplexer and Stereoscopic Player are universal, affordable solutions for stereoscopic video recording and playback.

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