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Glossary
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ADF
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Automatic Document Feeder. This device, attached to the scanner, frees the operator
from positioning each page on the scanner.
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CD
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Compact Disk. Each disk holds about 600 to 700 MegaBytes of information.
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Compression
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The process whereby the raw image is represented with fewer bytes. Both Lossy and
Lossless compression schemes are available.
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Double-Letter sized
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Page size that is 11" x 17".
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DPI
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Dots per inch. See Resolution.
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Duplex
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Refers to scanners which scan both sides of a page on a pass through the scanner.
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ICR
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Intelligent Character Recognition. Same as OCR but implies information other than
the pixels in the image can be used to increase accuracy.
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IPM
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Images per minute. Refers to the number of images the scanner can produce from a
double-sided page.
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Legal sized
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Page size that is 8.5" x 14".
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Letter sized
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Page size that is 8.5" x 11".
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Lossless
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No information is lost compressing a raw image file. CCITT4 is one lossless compression
scheme.
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Lossy
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Some information from the raw image is lost in an effort to minimize file size.
JPEG is one lossy compression scheme.
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OCR
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Optical Character Recognition. This is the process whereby the image is converted
to text and can be edited. Also, see ICR
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PDF
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Portable Document Format. Developed by Adobe to by system independant.
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Pixel
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Also PEL, picture element. The smallest unit of information in an image
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PPM
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Pages per minute. Refers to the number of physical pages the scanner can process
in a minute.
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Resolution
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Number of pixels for each inch on the original page. The higher the value, the more
detail and the smoother the edges in the image.
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Scanner
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Device used to create a digital representation of information on page of paper
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SCSI
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Small Computer Systems Interface. A card inserted into motherboard of computer to
communicate with scanner or other devices.
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Simplex
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Refers to scanners which scan only one side of a page on a pass through the scanner.
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