Digital visualizer

Digital Visualizers or Document Cameras or Digital overheads or docucams are real-time image capture devices for displaying object to a larger audience. They are in essence, high resolution web cams, mounted on arms so as to facilitate their placement over a page. This allows a teacher to display a three-dimensional object or write on a non-transparent sheet of paper while the class observes.

Document cameras are typically used in classrooms and connected to LCD (or DLP) projectors with VGA cables (like a computer monitor). Most document cameras can also send a video signal to a computer via USB cable.

Many portable document cameras incorporate a flexible gooseneck design for ease of use, and some manufacturers periodically increase image resolution to keep up with the High-Definition display technology. High-Definition document cameras include an HDMI output port.

The most economical document cameras in 2008 capture XGA resolution images of 1024 x 768 pixels, which yields 786,000 pixels. Document cameras that capture SXGA images, or super extended graphics array, which equates to a resolution of 1280 x 1024 pixels. SXGA images have 66% more pixels than XGA images of the same size, which means the pixels are smaller and provide sharper detail. UXGA is considered High-Resolution and equates to 1920 x 1080 pixels.

External links

• Prices of Digital Visualizers