4.5.3 Auto Letter/Photo Separation
In auto letter/photo mode, the original image is separated into letter and
photo areas (dot screen areas).
NOTE:
"Letter" refers to an original or area of an original that contains text
and/or line drawings.
Generally, letter areas have strong contrast between the image and the
background. However, photo areas (dot screen areas) have a less extreme
range of contrast levels.
By using these characteristics and the following separation methods, the
original image is separated into black letter areas, colored letter areas, and
photo areas in the final evaluation circuit.
IMAGE PROCESSING
A166/A187/A189 2-48 SM
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