A viewer is an interactive tool widely considered to be the digital version of the overhead projector. A camera is fitted to an articulated or fixed bracket, and takes images of text, 3D objects, transparencies, moving objects, etc. The images are then displayed through a video projector or monitor.


It can be used, for example, to display hard copies of documents (photos, maps, a page from a manual, technical specifications, etc.), to show action as it happens, or how technology works, to annotate a document in real time, to zoom, or to highlight an important point.

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