| 摘要 |
PURPOSE: A system for graphic overlay of an electronic black board, is provided to lecture and record linked a lecture through a personal computer and multimedia equipment such as a VCR, TV substance screen, by inputting-outputting a green graphic on a video graphics array(VGA) phase as well as a national television system committee(NTSC) composite phase and making the green graphic displayed on a touch screen, as a converting to a VGA mode of an NTSC mode is possible. CONSTITUTION: A system for graphic overlay of an electronic black board comprises a touch screen(10), a personal computer(PC,20), and a projector(30). The PC(20) displays a green graphic in the touch screen on a video graphics array(VGA) phase. And the projector(30) displays a graphic, displayed in the VGA phase by the PC(20), in the touch screen(10). The PC(20) has a smartboard kernel(22), a mouse event handler(24), an on screen display(OSD) kernel(26), and an OSD picture in picture(PIP) board(28). The smartboard kernel(22) converts a screen coordinate of a green graphic to a window coordinate on the touch screen(10). The mouse event handler(24) processes an image of a graphic of the converted window coordinate. The OSD kernel(26) converts the image-processed graphic of the window coordinate to a national television system committee(NTSC) coordinate. And the OSD PIP board(28) displays the graphic of the NTSC coordinate on an NTSC composite phase. |
