| 摘要 |
A camera tracking system that continuously tracks sound emitting objects is provided. A sound activation feature of the system enables a video camera to track speakers in a manner similar to the natural transition that occurs when people turn their eyes toward different sounds. The invented system is well suited for video-phone applications. The invented tracking system comprises a video camera for transmitting an image from its remote location, a screen for receiving images, and microphones for directing the camera. The camera may be coupled to the microphones via an interface for processing information transmitted from the microphones for directing the camera. The system may utilize the translucent properties of LCD screens by disposing a video camera behind such a screen and enabling persons at each remote location to look directly into the screen and at the camera. The interface enables intelligent framing of a speaker without mechanically repositioning the camera. The microphones are positioned using triangulation techniques. Characteristics of audio signals are processed by the interface for determining movement of the speaker for directing the camera. As the characteristics sensed by the microphones change, the interface directs the camera toward the speaker. The interface continuously directs the camera, until the change in the characteristics stabilizes, thus precisely directing the camera toward the speaker.
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