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aszlig 7b5263e1a6
tesseract: Package version 4.x from Git master 
Tesseract 4 has got a new long short-term memory neural networking based
OCR engine which really helps a lot in terms of accuracy and our VM
tests.

I ran the new version across a bunch of different screenshots and
comparing the results to the 3.x branch and it really makes a big
difference, especially with various font rendering settings.

The only downside of this is that version 4 hasn't been released yet and
is in alpha state right now, but it will eventually get there and the
only solutions that came into my mind sticking to version 3 were really
sub-par:

 * Use several passes with different color negation on the screenshots.
 * Train Tesseract 3 specifically for screenshots. This is sub-par
   because we'd need to do it for Tesseract 4 from scratch again.
 * Change the test systems so that it specifically uses *only* OCR an
   font when displaying. I've actually tried this but this also isn't
   accurate enough with our default font rendering setup.
 * Turn off special font rendering settings for our tests. In
   conjunction with changing to an OCR font this might work but it won't
   catch all the cases, because applications might use their own font
   rendering.

Given that version 4 is faster[1] when it comes to OCR detection and also
the points just mentioned I think even using the alpha version just for
tests isn't going to hurt anybody.

[1]: https://github.com/tesseract-ocr/tesseract/wiki/4.0-Accuracy-and-Performance

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
2017-04-11 03:21:46 +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 tesseract: Reintroduce enableLanguages 2017-04-11 03:21:26 +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: