Oxford University researchers have developed the Parallel Tracking and Mapping (PTAM) program, a camera-tracking system for fusing real and three-dimensional (3D) computer-generated visuals. PTAM enables users to project virtual objects or characters into a video stream that appears on real world surfaces. “The blending of real and virtual worlds is common enough in films and television, but is usually achieved by extensive processing of the recorded images or by filming in studios with known objects at fixed locations,” says Oxford professor David Murray. “The PTAM software allows developers to augment a camera’s video stream in real time and in everyday locations.” PTAM builds a map of thousands of features from objects and scenes, tracks accurately and at a standard frame rate, and calculates the camera viewpoint and angle. The technology also could improve global positioning systems and digital compasses, and provide support for satellite, 3G, and Wi-Fi signals.
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Purdue University researchers have developed a device that uses microring resonators to convert laser pulses into bursts of pulsating radio-frequency signals that avoid interference. The researchers say the technology could eliminate the need for wires when transferring data in homes, offices, and cars. The technology could enable all communications to be transmitted from a single base station, says Purdue professor Minghao Qi. Similar technology could eventually be developed to both transmit and receive signals. The key factor in making the breakthrough practical is that the pulses transmit radio frequencies of up to 60 gigahertz, which does not require a license in the United States. The unlicensed band also is permitted globally, which would allow the system to be implemented worldwide. The system’s tiny silicon microring resonators filter out certain frequencies and allow others to pass. The microring filter can be tuned by heating the rings, which causes them to change and filter out different frequencies.
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