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a443bdc0a6
First of all, we're now using ImageMagick to improve the screenshot so that Tesseract has an esier time to recognize the text. The resulting image of this post-processing is a scaled up black-and-white version with the backgrounds almost entirely removed and the text edges a bit blurred, so the screen shots now more or less resemble an image from a scanner rather. This is what Tesseract is trained for by default. As mentioned in the previous commit we now also use Tesseract 4, which further improves the quality of text recognition. I've spent countless hours just to test different postprocessing variants and testing what works best for our tests and this is the one that worked best so far. It's certainly not perfect and I'd like to avoid the scaling step but we're way better off than before. In addition to this, the OCR process is now done without an intermediate file, solely using pipes. I've tested this using the following VM tests which have OCR enabled: * nixos/tests/chromium.nix -A stable * nixos/tests/emacs-daemon.nix * nixos/tests/installer.nix -A luksroot * nixos/tests/lightdm.nix * nixos/tests/plasma5.nix * nixos/tests/sddm.nix All of the tests still succeed and comparing some of the recognition results to the earlier results it now also detects a lot more text than before this commit. Signed-off-by: aszlig <aszlig@redmoonstudios.org> |
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*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.