Canon DR-5020 Instructions Manual page 67

Margin Adjusts the margins (top, bottom, left and right) of the scanning
Scanning area.
To adjust the margins, click Enable and use the
buttons.
Specify within the range –10 (reduces scanning area by 10 mm)
to +10 (enlarges scanning area by 10 mm).
For example, if you want to slightly enlarge the scanning area so
that document edges are not clipped, adjust in the + direction.
Or, if you want to slightly reduce the scanning area so that a
black frame is not formed around the scanned image, adjust in
the – direction.
Double Select the method used to detect double feed. "Double feed" is
Feed detected when two or more sheets of the document are fed
Detection together or when part of one sheet overlaps another sheet when
the sheets in the document are scanned continuously.
[Detect by thickness]
Detects double feed by the thickness of the paper. When a
document thicker than the first sheet of the document(*) is fed,
the scanner judges this to be a double feed and displays an
error.
[Detect by length]
Detects double feed by the length of the paper. When a
document longer than the first sheet of the document(*) is fed,
the scanner judges this to be a double feed and displays an
error.
* Double feed detection is carried out taking the thickness and
length of the first sheet of the document as the standard sheet.
When the first sheet of the document is fed, the scanner
memorizes the thickness and length of the document.
2.4 Setting Scan Conditions
and
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