Advantage I-200 User's Guide download pdf (Page 8)

A-61520 April 2005 7

Scanning bi-tonal images Bi-tonal images are scanned images that are made up of only black-

and-white elements. The descriptions below are for bi-tonal images

only.

Binarization is the process of converting a grayscale or color image to

a bi-tonal image. There are several different methods of performing this

conversion. Two of the options are iThresholding and Adaptive

Threshold Processing.

These options are applied to grayscale scanned images and output a

bi-tonal electronic image. iThresholding and Adaptive Threshold

Processing separate the foreground information from the background

information even when the background color or shading varies, and the

foreground information varies in color quality and darkness. Different

types of documents may be scanned using the same image processing

parameters and still result in excellent scanned images.

• iThresholding: selecting iThresholding allows the scanner to

dynamically evaluate each document to determine the optimal

threshold value to produce the highest quality image. This allows

scanning of mixed document sets with varying quality (i.e., faint text,

shaded backgrounds, color backgrounds) to be scanned using a

single setting thus reducing the need for document sorting.

When using iThresholding, only Contrast may be adjusted.

• Adaptive Thresholding (ATP): the Adaptive Threshold Processor

separates the foreground information in an image (i.e., text, graphics,

lines, etc.) from the background information (i.e., white or non-white

paper background).

When using Adaptive Thresholding, Threshold and Contrast may be

adjusted.

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Advantage I-200 User's Guide Page 8