pyocr with latest Tesseract fails with pyocr.error.TesseractError: "Error, unknown command line argument '-psm'\n") about pyocr

[ddddavidmartin]

Having a look through the pyocr sources this stands out to me:

src/pyocr/builders.py
307-        file_ext = ["txt"]
308:        tess_flags = ["-psm", str(tesseract_layout)]
309-        cun_args = ["-f", "text"]
--
564-        file_ext = ["html", "hocr"]
565:        tess_flags = ["-psm", str(tesseract_layout)]
566-        tess_conf = ["hocr"]
--
640-        file_ext = ["html", "hocr"]
641:        tess_flags = ["-psm", str(tesseract_layout)]
642-        tess_conf = ["hocr"]

Does pyocr just use -psm instead of --psm as the parameter? I'm wondering whether that is not accepted anymore now.

[ddddavidmartin]

Does pyocr just use -psm instead of --psm as the parameter? I'm wondering whether that is not accepted anymore now.

It looks like this is the problem. I have changed the passed options in builds.py to provide --psm instead of -psm and it works fine now. I might create a pull request for this though I'm not sure whether there are any other implications of this.

The commit in question in tesseract is the following:
tesseract-ocr/tesseract@ee201e1

[simonm3]

I also came across this today. I note that -psm is used not just in builders.py but also in tesseract.py.

[jflesch]

#100

[ddddavidmartin]

I haven't had a chance yet to work out the circular import statements that I introduced in https://github.com/ddddavidmartin/pyocr/tree/update_deprecated_psm_option_string. If anyone wants to step in, feel free to give it a go.

For now, a quick and dirty fix is to just apply c136838.