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nixos/testing: Improve quality of OCR 
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>
2017-04-11 03:21:53 +02:00
.github CONTRIBUTING.md: improve commit message guidelines 2017-02-06 22:26:32 +02:00
doc doc: fix overlays paths 2017-04-02 10:11:01 +02:00
lib keychain: add sigma as maintainer 2017-04-09 22:28:27 -07:00
maintainers/scripts docs: 16.09 -> 17.03 2017-03-30 17:36:44 +02:00
nixos nixos/testing: Improve quality of OCR 2017-04-11 03:21:53 +02:00
pkgs tesseract: Package version 4.x from Git master 2017-04-11 03:21:46 +02:00
.editorconfig Do not trim trailing whitespace in patch files 2017-01-12 23:44:26 +01:00
.gitignore kde5: consolidate packages into desktops/kde-5 2016-03-01 10:36:00 -06:00
.mention-bot Remove bbenoist from maintainers 2017-03-23 03:03:04 +01:00
.travis.yml Fix a missed sudo: true line 2017-03-24 16:38:42 +00:00
.version version: it's 17.09 not 17.10 2017-02-27 20:46:35 +01:00
COPYING Time passing by 2017-01-01 21:35:52 +01:00
default.nix default.nix: Provide correct instructions how to upgrade Nix 2017-03-18 21:04:07 +02:00
README.md docs: 16.09 -> 17.03 2017-03-30 17:36:44 +02:00

README.md

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Build Status Code Triagers Badge

Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:

% git remote add channels git://github.com/NixOS/nixpkgs-channels.git

For stability and maximum binary package support, it is recommended to maintain custom changes on top of one of the channels, e.g. nixos-17.03 for the latest release and nixos-unstable for the latest successful build of master:

% git remote update channels
% git rebase channels/nixos-17.03

For pull-requests, please rebase onto nixpkgs master.

NixOS linux distribution source code is located inside nixos/ folder.

Communication: