How Does a Scanner Work?
Different versions from different companies may have slight variations in the working and design but the core principle remains the same among all the scanners.
The document is placed on the scanner and the lid is closed after which a light source is used to illuminate the document from below. A scan head which comprises of mirror, lens, filter and CCD (Charge-coupled device) array is then moved across the document with the help of a belt and a stepper motor. A stabilizer is used to keep the scan head stable. A pass means that the scan head has completed one complete scan of the entire document. The image of the document is then reflected by an angled mirror on another secondary mirror. Secondary mirror reflects the image onto a lens. The lens focuses the image on the CCD array through a filter. The arrangement of the lens and CCD array may differ from scanner to scanner. Most scanners utilize a three pass method where different color filters (red, green or blue) are used between the lens and CCD array to generate the image. After all the three passes are complete the software assembles all the three filtered images into a single full-color image.
What is Scanner?
A scanner is an electrical device can read and translate text, images, and other materials into a digital signal. This transforms the documents into a format that computer software programs can use to view and/or edit them. There are many different types of scanners with various resolutions on the market.
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