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A document camera can enlarge the small print in books and project a printed page as if it were a traditional transparency by using a zoom feature. Document cameras do not require the lights to be dimmed in the room they are used in, contrary to what overhead projectors need to be visible. [3]
WolfVision Visualizer systems (also known as document cameras) are special optoelectronic devices designed to pick up images of 3-dimensional objects, documents, books, photos and other items from a non-reflective working surface, providing a high resolution output signal for video/data projectors, monitors, interactive whiteboards or ...
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In contrast, a modern LCD or DLP projector often uses an Ultra-high-performance lamp which has a higher luminous efficacy and lasts for thousands of hours. [5] A drawback of that technology is the warm up time required for such lamps. Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector.
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In educational settings, the specific role of the opaque projector has been superseded first by the overhead projector and later the document camera, a lighted table with a fixed video camera above it. The image from the camera is displayed using a separate projector. The document camera is also called a desktop presenter unit or opaque projector.
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