PSM on Tesseract

Page segmentation modes:
0    Orientation and script detection (OSD) only.
1    Automatic page segmentation with OSD.
2    Automatic page segmentation, but no OSD, or OCR.
3    Fully automatic page segmentation, but no OSD. (Default)
4    Assume a single column of text of variable sizes.
5    Assume a single uniform block of vertically aligned text.
6    Assume a single uniform block of text.
7    Treat the image as a single text line.
8    Treat the image as a single word.
9    Treat the image as a single word in a circle.
10   Treat the image as a single character.
11   Sparse text. Find as much text as possible in no particular order.
12   Sparse text with OSD.
13   Raw line. Treat the image as a single text line,
     bypassing hacks that are Tesseract-specific.

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