Canon imageFORMULA R40 User Manual page 41

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.
Select the [Double Feed Detection] check box.
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