Canon IMAGE FORMULA DR-C125 - Manual (Page 76)

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When you want to enhance text that is difficult to read
because of factors such as the background of the
scanned document
Select [Advanced Text Enhancement II] in the [Color mode] setting.
The background behind the text is removed or processed so that the
text is emphasized for better readability.
When you want to match the orientation of images to the
text when scanning a mixture of pages with different text
orientations
Select the [Text Orientation Recognition] check box. The text
orientation on each page is detected, and the scanned image is
rotated in 90-degree increments to correct the orientation.
Hint
When the [Text Orientation Recognition] check box is selected,
[Document Orientation] is unavailable.