| 摘要 |
A method of relaying video images in a multimedia videoconference between a plurality of multimedia user equipment (550, 560, 570, 580) includes the step of transmitting layered video images by a number of said plurality of user equipment wherein said layered video images inlcude a base layer (552, 562, 572, 582) and one or more enhancement layers (555, 565, 575, 585). The transmitted layered video images are received at a multipoint control unit (520), where a number of base layer video images of a number of active speakers (535) and one or more enhancement layers (540) of a most active speaker are selected. the multipoint control unit (520) transmits the base layer video images, and one or more enhancement layers (540) of the most active speaker, to one or more of the plurality of multimedia user equipment (550, 560, 570, 580). The identification of the speakers is much improved compared to traditional videoconference systems, as the available bandwidth is shared to allow one enhancement layer and several base layers to be sent, instead of only one full quality video stream.
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