Tech Tip: Live Video & Overlays for Win 95/98 &
| The PIXCI® SV4 imaging board can, in conjunction
with an appropriate S/VGA card, display live video directly
upon the VGA monitor, under Win 95/98 or Win NT. This allows
full video rate display, even on slower PC's; and avoids using
processor power to repeatedly copy images from system memory
to the S/VGA.
With selected S/VGA cards, graphic overlays over live video are also available!
The S/VGA requirements are:
In addition, the DirectX enhancement must be installed in Win 95 (DirectX is included with Win NT and need not be installed separately). DirectX is available from Microsoft and most VGA manufacturer's web sites, for example:
The live video feature expects a color video format. If using a monochrome camera, simply select NTSC (or PAL) format; the video format will be color, but the perceived image will remain monochrome.
For users of "C" libraries, putting live video into a window requires only two, simple, function calls. Thereafter, any of the Windows standard Graphics Device Interface functions (e.g. TextOut, LineTo, or their MFC or Visual Basic equivalents) can be used to draw graphics or text in the window, which automatically appears overlayed on the live video!