摘要
The design and realization of a videoconference system based on international recommendation are introduced in this paper, and the hardware implementation of video codec based on ITU-T H. 261 is briefly discussed. Furthermore, the buffer control method and the adaptive control strategy for quantization are proposed, which are adaptive and robust. This system can be operated under the transmission rate ranging from 128kb/s to 2Mb/s. With these strategies for the videoconference system, the high quality image is obtained. The time delay of the system is about half a second.
The design and realization of a videoconference system based on international recommendation are introduced in this paper, and the hardware implementation of video codec based on ITU-T H. 261 is briefly discussed. Furthermore, the buffer control method and the adaptive control strategy for quantization are proposed, which are adaptive and robust. This system can be operated under the transmission rate ranging from 128kb/s to 2Mb/s. With these strategies for the videoconference system, the high quality image is obtained. The time delay of the system is about half a second.
基金
the High Technology Research and Development Programme of China
关键词
RECOMMENDATION
H.
261
VIDEOCONFERENCE
CODEC
BUFFER
CONTROL
Adaptive control systems
Analog to digital conversion
Communication channels (information theory)
Computer hardware
Digital to analog conversion
Image coding
Image quality
Robustness (control systems)
Standards
Video signal processing
