Automatic Edge Detection And Document Centering; Determining Document Quality - Xerox 5101 User Manual

3 Document Quality
DYNAMIC BACKGROUND REMOVAL only monitors the document in the process direction, from
the lead edge to the trail edge. It cannot make adjustment from the left side to the right side of
the document. For example, if the input document is dark, DYNAMIC BACKGROUND REMOVAL
will automatically make the appropriate compensation to optimize the reproduction of the dark
details. If the input document has a faded background, the feature will enable a faithful
reproduction of the original. However, the faded background must be inserted with the fading
running in the process direction with the darker side being inserted first.
In some cases, you may wish to optimize the settings for individual documents. For example, you
may not wish to faithfully reproduce paste-up lines, or other artifacts on the original. For this
reason, additional controls are available for selection of document type, document image quality,
desired output darkness, and background suppression.
The DYNAMIC BACKGROUND REMOVAL feature, when enabled, uses information about the
document captured during the scanning process to set image quality settings. The system
automatically adjusts for the darkness of the background and the image content throughout the
length of the document. When not enabled, it only uses the information in a 0.70 (17.8 mm) area
over the width of the document to establish the image quality settings. Therefore, best results can
be obtained if the document is fed in with an edge that has a representative sampling of both the
background and the foreground image.
The Dynamic Background Removal feature provides an accurate copy for most documents
including blueline, blueprints, color line art/text, and mixed documents containing combinations of
halftone and art, or photograph and art. For documents with inverted images, the INVERT
function should be enabled. Refer to "Inverting an image" in the "Special features keys" section
for instructions on the INVERT function.

Automatic Edge Detection and Document Centering

The AUTOWIDTH /AUTOCENTER features enable the system to automatically detect the width
and center of the document. In cases such as transparencies or translucent documents where
automatic detection is not possible, a message will prompt you to enter the width manually. You
then must center the document before inserting it into the Scan System.
You can enable/disable the AUTOWIDTH/CENTER feature at any time. Refer to "Scan System
Control" in the "Main Menu" section of this manual for more information.
PRODUCTIVITY MODE: This feature became available with version 10.0 FreeFlow Accxes
software, and requires a new Wide Format Scan System with the Productivity Document Feed
Tray with the discrete width sensors. This feature measures the document width without doing a
pre-scan, requiring the operator to manually align the document within the media size guidelines
on the Feed-in Tray. The width sensors eliminate the need for a prescan, thereby increasing the
overall throughput of the system, resulting in higher productivity.
When the PRODUCTIVITY MODE is used, the operator must select the media series, ANSI,
ARCH, ISO A, CUSTOM, etc., since the number of sensors that can be provided cannot monitor
every media series. The PRODUCTIVITY mode can be enabled/disabled at anytime. Refer to
"Scan System Control" in the "Main Menu" section of this manual for more information.

Determining Document Quality

Some documents require additional adjustments to obtain the best copy quality. Documents of
good quality are easy to scan and usually give good copies on the first attempt. Documents of
bad quality may require more than one attempt, using different settings, to obtain the best copy
quality.
42 Wide Format Copy System User Guide