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A-61517 October 2004 4-10
Binarization the following descriptions are for binary images
only.
Two of the options are iThresholding and Adaptive Thresholding. These
options work on grayscale scanned images and outputs a bi-tonal
electronic image. Their strength lies in the ability to 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 results in
excellent scanned images.
Available binarization options are:
• 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.
• Fixed Processing (FP): used for black-and-white and other high
contrast documents. A single level is set to determine the
black-and-white transition. The threshold is programmable over the
entire density range. Fixed thresholding sets Contrast to 0. If Fixed
Processing is selected, Contrast is not available.
• 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.