Canon Image Formula P-215 - Manual (Page 61)

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Advanced Text Enhancement II is suitable for scanning a document
with a uniform background color and light text and background. If the
background is non-uniform, such as a pattern, the background may
not be able to be completely removed and the text may become
difficult to read. If necessary, you can make the text in scanned
images easier to read by adjusting the contrast on the [Brightness]
tab.
When you want to detect multiple pages fed at the same
time
Select the [Detect by Length] check box under the [Double Feed
Detection] on the [Feeding] tab.
When you want to match the orientation of images to the
text when scanning a mixture of pages with different text
orientations
Select [Text orientation recognition] in [Document Orientation] on the
[Others] tab. The text orientation on each page is detected, and the
scanned image is rotated in 90-degree increments to correct the
orientation.
When you want to rotate the images of a document placed
horizontally to correct the orientation
Specify the rotation angle in [Document Orientation] on the [Others]
tab.