Canon P-150M - Manual (Page 82)

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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 mode setting. The
background behind the text is removed or processed so that the text
is emphasized for better legibility.
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 [Text Orientation Recognition] is selected, [Document
Orientation] is disabled.
When you want to rotate the images of a document loaded
horizontally to correct the orientation
Specify the rotation angle with [Document Orientation] in the dialog
box displayed when you click the [Image processing] button.