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58 A-61527 May 2006
Binarization is the process of converting a grayscale or color image to
a binary image. There are several different methods of performing this
conversion. The following descriptions are for binary images only.
The following binarization 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 the 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. Contrast values may range from 1 to 100. A Contrast value
of 100 is considered fully adaptive thresholding.
Fixed thresholding ATP disabled ATP enabled