Kodak 9500 manual Appendix E Image Processing, Terminology

Appendix E Image Processing

This appendix provides an overview of image processing capabilities which are controlled by the host computer using scanner-unique commands and guidelines for evaluating scanned images.

This information pertains to the following:

∙Kodak Digital Science Scanner 9500 series

∙Kodak Digital Science Scanner 5500 and 7500 series

∙Kodak Digital Science Document Scanner/Microimager 990

NOTE: For the purpose of this appendix, when referring to the scanner and the scanner/microimager the term “scanner” will be used. Any specific differences between the Document Scanner 9500, 5500, 7500 series and the Scanner/Microimager 990 will be noted.

Terminology	The following terms are used when describing the image
	processing capabilities of the scanner.
	Adaptive Threshold Processing — separates the foreground
	information in an image from the background information.
	Bi-tonal image — an unscreened image that consists of pixels
	which are either black or white (1 bit/pixel).
	Continuous tone image — an image, such as a photograph,
	which can assume all possible shades of gray.
	Digitized image — an image made up of pixels represented by
	binary ones and zeros.
	Gray levels — discrete shades of gray.
	Gray scale images — an image that consists of pixels which are
	assigned values based upon a range of gray shades.
	Halftone images — the simulation of a continuous tone image by
	a printing process. The simulation is achieved by using a series
	of dot patterns. Newspaper photographs are an example of
	halftone images.
	Noise (background noise) — small dots or specks that appear
	in the background of a scanned image. These specks increase
	file compression size and usually contain no image information.
	Pixel — a single picture element of a digitized image. Pixels can
	be binary (1 bit/pixel) or gray (multiple bits).

A-61122/A-61124 March 1999 E-1