Camera Synchronization for Panoramic Videos
| Autor: | Carsten Griwodz, Pål Halvorsen, Michael Riegler, Ragnar Langseth, Tomas Kupka, Dag Johansen, Håvard Espeland, Håkon Kvale Stensland, Vamsidhar Reddy Gaddam, Håvard D. Johansen |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Brightness
Panorama business.industry Computer science 3D reconstruction ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION 020207 software engineering 02 engineering and technology Rendering (computer graphics) Software 0202 electrical engineering electronic engineering information engineering 020201 artificial intelligence & image processing Computer vision Artificial intelligence Zoom Visual artifact Ghosting business ComputingMethodologies_COMPUTERGRAPHICS |
| Zdroj: | MediaSync ISBN: 9783319658391 MediaSync, Handbook on Multimedia Synchronization |
| Popis: | Multi-camera systems are frequently used in applications such as panorama videos creation, free-viewpoint rendering, and 3D reconstruction. A critical aspect for visual quality in these systems is that the cameras are closely synchronized. In our research, we require high-definition panorama videos generated in real time using several cameras in parallel. This is an essential part of our sports analytics system called Bagadus, which has several synchronization requirements. The system is currently in use for soccer games at the Alfheim stadium for Tromso IL and at the Ullevaal stadium for the Norwegian national soccer team. Each Bagadus installation is capable of combining the video from five 2 K cameras into a single 50 fps cylindrical panorama video. Due to proper camera synchronization, the produced panoramas exhibit neither ghosting effects nor other visual inconsistencies at the seams. Our panorama videos are designed to support several members of the trainer team at the same time. Using our system, they are able to pan, tilt, and zoom interactively, independently over the entire field, from an overview shot to close-ups of individual players in arbitrary locations. To create such panoramas, each of our cameras covers one part of the field with small overlapping regions, where the individual frames are transformed and stitched together into a single view. We faced two main synchronization challenges in the panorama generation process. First, to stitch frames together without visual artifacts and inconsistencies due to motion, the shutters in the cameras had to be synchronized with sub-millisecond accuracy. Second, to circumvent the need for software readjustment of color and brightness around the seams between cameras, the exposure settings were synchronized. This chapter describes these synchronization mechanisms that were designed, implemented, evaluated, and integrated in the Bagadus system. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|