Imaging devices, such as optical scanners, are well-known in the art and produce machine-readable image data signals that are representative of a scanned object. Optical scanners are typically used to read the surface of a document having either textural or graphical information and to convert the information into digital signals which can be stored and processed by a digital computer. A typical optical scanner includes illumination and optical systems to illuminate the object and to focus a small area of the illuminated object, usually referred to as a "scan line," onto the surface of a photosensitive detector positioned within the scanner. The photosensitive detector array used to detect the image light focused thereon is typically a charge-coupled device (CCD), although other devices may also be used. A typical CCD may comprise a large number of individual cells or "pixels," each of which collects or builds-up an electrical charge in response to exposure to light. A typical image scanner comprises a housing with a transparent platform installed on its top for placing a document to be scanned, and a flat panel rotationally connected to the housing. During scanning of a document, the flat panel is lifted away from the transparent platform of the housing, the document is placed on the transparent platform, and then the flat panel is attached to the transparent platform of the housing. Flatbed image scanners have become very popular as peripheral equipment for computers. A flat bed scanner has a stationary, transparent plate upon which a document to be imaged is positioned face-down. A hand-held or portable optical scanner is an optical scanner which is designed to be moved by hand across the object or document being scanned.
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