发明授权
- 专利标题: Multi-point visual communication system
- 专利标题(中): 多点视觉通信系统
-
申请号: US299633申请日: 1994-09-02
-
公开(公告)号: US5617135A公开(公告)日: 1997-04-01
- 发明人: Fumio Noda , Koichi Shibata , Taizo Kinoshita
- 申请人: Fumio Noda , Koichi Shibata , Taizo Kinoshita
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX5-220852 19930906
- 主分类号: H04N7/15
- IPC分类号: H04N7/15 ; H04N7/14 ; H04N7/52 ; H04N7/60 ; H04N7/10
摘要:
A multi-point visual communication system which includes an adaptive filter part for controlling a spatial frequency characteristic of a video signal, a filter selector for selecting a video quality to be transmitted from its own site on the basis of integrated requests received from sites, and a filter control for adaptively controlling a filter characteristic taking both of a video information quantity and situations of a telecommunication network into consideration, and wherein a video signal processed by the adaptive filter part is subjected to an encoding operation and then transmitted to the telecommunication network. Thereby, the video quality can be selected according to users' requests, and the video quality of the multi-point visual communication can be improved without incurring an excessive increase of a video information quantity. Further, through the video signal processing taking both the video characteristic and the telecommunication network situations into consideration, a comparatively high quality of video transmission can be realized when viewed from an information quantity.
公开/授权文献
- US5994018A Toner 公开/授权日:1999-11-30