| 摘要 |
Embodiments of the present invention include an apparatus and method for capturing marker or pen strokes on a whiteboard, and creating output video signal that shows how the contents of the whiteboard changes over time during a lecture or presentation. A conventional whiteboard surface is used. Conventional whiteboard tools, such markers, are fit with holders or adapters to allow their state (e.g., marker color, marker up, marker down, marker position) to be sensed as human interface device (HID) events. Other parameters affecting how the output video may be entered through a whiteboard user interface. HID events are converted into video output signal by a whiteboard video generator, using the HID events to maintain an up- to-date representation of the cumulative state of the whiteboard surface. This cumulative state is regularly transmitted as digital and /or analog signal to output ports. At any time, a snapshot of the current state of the whiteboard can be saved by a user to an external storage device, such as a flash drive, as an image (e.g., JPEG) file. The whiteboard video generator is preferably an appliance that is dedicated to the task of maintaining the cumulative state of the whiteboard surface, creating video, and storing snapshots on demand. |
