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Abstract

Disclosed is a distributed-processing motion capture system (and inherent method) comprising: plural light point devices, e.g., infrared LEDs, in a motion capture environment, each providing a unique sequence of light pulses representing a unique identity (ID) of a light point device; a first imaging device for imaging light along a first and second axis; and a second imaging device for imaging light along a third and fourth axis. Both of the imaging devices filter out information not corresponding to the light point devices, and output one-dimensional information that includes the ID of a light point device and a position of the light point device along one of the respective axes. The system also includes a processing device for triangulating three-dimensional positions of the light point devices based upon the one-dimensional information. The system is very fast because the necessary processing is distributed to be maximally parallel. The motion capture system uses a cylindrical collimating (CC) optics sub-system superimposed on a cylindrical telecentric (CT) optics sub-system. The outputs of the plural light point devices are modulated to provide a unique sequence of light pulses representing a unique identifier (ID) for each of the light point devices according to a predetermined cycle of modulation intervals based upon synchronization signals provided via RF communication. At least two of the light point devices concurrently provide light during the cycle.

Other References

• Dyer et al., Motion Capture White Paper, Dec. 12, 1995
• "Acclaim Entertainment, Inc." product literature
• "Meeting Evolving VR Needs[,] Ascension's Family of Motion Tracking Devices", Jack Scully, Ascension Technology Corporation, Product Literature
• "The Dream Machine", Steven Aukstakalnis, Virtual Reality News, Jul.-Aug. 1993, p. 16
• "Performance Capture for Film, Video and Game Production", Dean LaCoe, Motion Analysis Corporation, Production Literature
• "OPTOTRAK by Northern Digital, Inc." brochure, Oct. 1, 1993
• "Pholhemus Inc." product literature
• "A Testbed for Characterizing Dynamic Response of Virtual Environment Spatial Sensors", Adelstein et al., UIST '92 of the ACM, Nov. 15-18, 1992, pp. 15-22
• Polhemus "Technical Note[,] Latency--3Space Fastrak"
• "Accuracy, Resolution and Latency: VR's Most Misunderstood Terminology for Electromagnetic Tracking", James C. Kreig, Electronic Imaging West 92, pp. 1-8
• "Accuracy, Resolution, Latency and Speed; Key Factors in virtual Reality Tracking Environments", James C. Kreig, Polhemus Incorporated, Sep. 1992, pp. 1-11
• "A 4 Millisecond, Low Latency, 120 HZ. Electromagnetic Tacker for Virtual Reality Applications", Kreig et al. pp. 1-3
• "Science Accessories Corp. 1992 Annual Report"
• Mira Imaging Inc. brochure on "Hyperspace" products
• Selspot Systems Ltd. "Robot Check" product literature
• SuperFluo Inc. product literature
• Motion Capture: It's Real, It's Time, Animation Magazine, Tina White and Benjamin G. Levy vol. 5, Issue 3/4 Summer 1992
• "Graphics You Can Chew On[,] Bubble gum ad uses animation to create an action-packed trip through a virtual world", John Webster Computer Graphics World, Jul. 1993, pp. 89-90
• "Full Steam Ahead[,] Created in a flash, Peter Gabriel's latest music video is packed with dazzling computer-generated special effects," Laureen Belleville, Computer Graphics World, Jun. 1993, pp. 171-172
• United Technologies Adaptive Optics Associates product literature on "Multi-Trax Systems