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2004 international conference on image processing (icip) visual echo cancellation in a projector-camera-whiteboard system.
| Content Provider | CiteSeerX |
|---|---|
| Author | Zhangi, Zhengyou Huangt, Thomas Zhoui, Hunning |
| Abstract | We propose to incorporate a whiteboard into a projector-camera system. The whiteboard serves as the writing sur-face (input) as well as the projecting surface (output). The ability to write and draw on top of computer-projected con-tent opns up many new opportunities for real-time collab-orations between people located on-site and remotely. Such applications inevitably require extracting handwritings from video images that contain both handwritings and the pro-jected content. By analogy with echo cancellation in au-dio conferencing, we call this problem visuul echo cancel-btioii. This paper presents one approach to accomplish the task. Our visual echo cancellation algorithm estimates the incident light and derive thc surface albedo based on both incident light and refection. By estimating the albedo, we can extract thc writings and recover their colors. Our ap-proach includes two hasic components of projector-camera systems: geometric calibration and color calibration. The first one solves the mapping between the position in the camera view and the position in the projector screen, while the second one solves the mapping hetween the actual color ofthe projected content and that seen by the camera. 1. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Incident Light Geometric Calibration Echo Cancellation Hasic Component Derive Thc Surface Albedo Problem Visuul Computer-projected Con-tent Au-dio Conferencing Image Processing Projector Screen Video Image Real-time Collab-orations Camera View Thc Writing Visual Echo Cancellation Projector-camera-whiteboard System Projector-camera System International Conference Visual Echo Cancellation Algorithm Color Calibration Actual Color Ofthe Pro-jected Content Whiteboard Serf Many New Opportunity |
| Content Type | Text |
| Resource Type | Article |
