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A-61122/A-61124 March 1999 E-7
Noise filter
The scanner uses two types of Noise filters: Remove Lone Pixel
and Majority Rule. Use the Noise filter to increase the
compression ratio and improve the appearance of document
images.
• Remove Lone Pixel — reduces random noise on bi-tonal
images by converting a single black pixel surrounded by white
to white or by converting a single white pixel surrounded by
black to black.
• Majority Rule — sets the central pixel value in a matrix
according to the majority of white or black pixels in a matrix.
NOTES:
• Using the Noise filter on documents containing very fine detail
(e.g., the dot on an "i" in 4-point type) may cause information to
be lost. It is recommended that you do not use the Noise filter
when scanning documents with text smaller than 7-point type.
• Using the Noise filter in conjunction with an appropriate
threshold value will optimize the appearance of images.
• Do not use the Noise filter with screening or error
diffusion/mixed mode.
Refer to Chapter 6
, Scanner-unique Commands
for a description
of the NX/Y/Z command.
This document has a significant amount of background noise: