Appendix A Glossary
Batch
A number of documents to be scanned as a group.
Bi-tonal image
An unscreened image that consists of pixels which are either black or white (1 bit/pixel), as opposed to gray scale (screened) images which consist of pixels which are assigned a value based upon a range of gray shades.
Calibration
An operation that determines any system nonuniformity for which the scanner must compensate during scanning. The unit must be calibrated at least once a day or after power has been turned on.
Charge-coupled device (CCD)
A
Compression
Compression is used to reduce the number of bytes needed for scanned document images, thus saving storage space and/or transmission time. This is accomplished with special algorithms that use
Continuous tone images
Images, such as photographs, which can assume all possible shades of gray.
Cropping
Technique used to capture a desired portion of an image. Allows the entire document to be scanned without all document data being stored.
Digitized image
Image data represented by binary ones and zeros.
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