On Thursday, February 20, 2025 at 11:38:34 PM UTC-5 [email protected]
wrote:
*Understanding Tesseract OCR and --psm: Why Removing It Can Improve
Accuracy for Scanned Books*
The recommendation to understand the operation of various page segment
modes and to experiment with alternatives are good ones, but "removing" the
--psm switch is equivalent to using *--psm 3*, which is the default.
You can get an overview of all the different page segmentation modes by
using *--help-psm*:
$ tesseract --help-psm
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. (not implemented)
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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