Merge pull request #1361 from LaurentBerger:TesseractInstall

How to install tesseract on windows (#1361)

modules/text/tutorials/install_tesseract/install_tesseract.markdown

+Tesseract (master) installation by using git-bash (version>=2.14.1) and cmake (version >=3.9.1){#tutorial_install_tesseract}
+===============================================================
+
+-#  We assume you installed opencv and opencv_contrib in c:/lib using [this tutorials](http://docs.opencv.org/master/d3/d52/tutorial_windows_install.html#tutorial_windows_gitbash_build]
+
+-# You must download [png lib](https://sourceforge.net/projects/libpng/files/libpng16/1.6.32/lpng1632.zip/download) and [zlib](https://sourceforge.net/projects/libpng/files/zlib/1.2.11/zlib1211.zip/download).
+Uncompress lpngx.y.zz in folder lpng and zlib in folder zlib. lpng and zlib must be in same folder as opencv and opencv_contrib.
+save this script with name installpngzlib.sh in c:/lib
+@code{.bash}
+#!/bin/bash
+myRepo=$(pwd)
+CMAKE_CONFIG_GENERATOR="Visual Studio 14 2015 Win64"
+RepoSource=zlib
+mkdir Build/$RepoSource
+pushd Build/$RepoSource
+cmake . -G"Visual Studio 14 2015 Win64" \
+-DCMAKE_INSTALL_PREFIX:PATH="$myRepo"/install/zlib -DINSTALL_BIN_DIR:PATH="$myRepo"/install/zlib/bin \
+-DINSTALL_INC_DIR:PATH="$myRepo"/install/zlib/include -DINSTALL_LIB_DIR:PATH="$myRepo"/install/zlib/lib "$myRepo"/"$RepoSource"
+cmake --build . --config release
+cmake --build . --target install --config release
+cmake --build . --config debug
+cmake --build . --target install --config debug
+popd
+RepoSource=lpng
+mkdir Build/$RepoSource
+pushd Build/$RepoSource
+cp "$myRepo"/"$RepoSource"/scripts/pnglibconf.h.prebuilt "$myRepo"/"$RepoSource"/pnglibconf.h
+cmake . -G"Visual Studio 14 2015 Win64" \
+-DZLIB_INCLUDE_DIR:PATH="$myRepo"/install/zlib/include -DZLIB_LIBRARY_DEBUG:FILE="$myRepo"/install/zlib/lib/zlibstaticd.lib \
+-Dld-version-script:BOOL=OFF -DPNG_TESTS:BOOL=OFF -DAWK:STRING= \
+-DZLIB_LIBRARY_RELEASE:FILE="$myRepo"/install/zlib/lib/zlibstatic.lib -DCMAKE_INSTALL_PREFIX="$myRepo"/Install/"$RepoSource" \
+"$myRepo"/"$RepoSource"
+cmake --build . --config release
+cmake --build . --target install --config release
+cmake --build . --config debug
+cmake --build . --target install --config debug
+popd
+@endcode
+-#  In git command line enter the following command :
+@code{.bash}
+./installpngzlib.sh
+@endcode
+
+-#  save this script with name installTesseract.sh in c:/lib
+@code{.bash}
+#!/bin/bash
+function MAJGitRepo
+{
+if [  ! -d "$myRepo/$1"  ]; then
+  echo "clonning ${1}"
+  git clone $2
+  mkdir Build/$1
+else
+  echo "update $1"
+  cd $1
+  git pull --rebase
+  cd ..
+fi
+}
+echo "Installing leptonica and tesseract"
+myRepo=$(pwd)
+CMAKE_CONFIG_GENERATOR="Visual Studio 14 2015 Win64"
+
+MAJGitRepo leptonica https://github.com/DanBloomberg/leptonica.git
+RepoSource=leptonica
+pushd Build/$RepoSource
+cmake -G"$CMAKE_CONFIG_GENERATOR" -DCMAKE_INSTALL_PREFIX="$myRepo"/Install/leptonica "$myRepo/$RepoSource"
+echo "************************* $Source_DIR -->debug"
+cmake --build .  --config release
+cmake --build $RepoSource  --target install --config release
+popd
+
+RepoSource=tesseract
+MAJGitRepo $RepoSource https://github.com/tesseract-ocr/tesseract.git
+pushd Build/$RepoSource
+cmake -G"$CMAKE_CONFIG_GENERATOR"  -DBUILD_TRAINING_TOOLS:BOOL=OFF -DCMAKE_INSTALL_PREFIX="$myRepo"/Install/tesseract -DLeptonica_DIR:PATH="$myRepo"/Install/leptonica/cmake -DPKG_CONFIG_EXECUTABLE:BOOL=OFF "$myRepo"/"$RepoSource"
+echo "************************* $Source_DIR -->release"
+cmake --build . --config release
+cmake --build .  --target install --config release
+
+popd
+RepoSource=opencv
+pushd Build/$RepoSource
+CMAKE_OPTIONS='-DBUILD_PERF_TESTS:BOOL=OFF -DBUILD_TESTS:BOOL=OFF -DBUILD_DOCS:BOOL=OFF -DWITH_CUDA:BOOL=OFF'
+cmake -G"$CMAKE_CONFIG_GENERATOR"  \
+-DTesseract_INCLUDE_DIR:PATH="${myRepo}"/Install/tesseract/include -DTesseract_LIBRARY="${myRepo}"/Install/tesseract/lib/tesseract400.lib -DLept_LIBRARY="${myRepo}"/Install/leptonica/lib/leptonica-1.74.4.lib \
+$CMAKE_OPTIONS -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
+-DINSTALL_CREATE_DISTRIB=ON -DCMAKE_INSTALL_PREFIX="$myRepo"/install/"$RepoSource"  "$myRepo/$RepoSource"
+echo "************************* $Source_DIR -->devenv debug"
+cmake --build .  --config debug
+echo "************************* $Source_DIR -->devenv release"
+cmake --build .  --config release
+cmake --build .  --target install --config release
+cmake --build .  --target install --config debug
+popd
+
+@endcode
+    In this script I suppose you use VS 2015 in 64 bits
+@code{.bash}
+CMAKE_CONFIG_GENERATOR="Visual Studio 14 2015 Win64"
+@endcode
+    and leptonica, tesseract will be installed in c:/lib/install
+@code{.bash}
+-DCMAKE_INSTALL_PREFIX="$myRepo"/install/"$RepoSource" "$myRepo/$RepoSource"
+@endcode
+    with no Perf tests, no tests, no doc, no CUDA and no example
+@code{.bash}
+CMAKE_OPTIONS='-DBUILD_PERF_TESTS:BOOL=OFF -DBUILD_TESTS:BOOL=OFF -DBUILD_DOCS:BOOL=OFF  -DWITH_CUDA:BOOL=OFF -DBUILD_EXAMPLES:BOOL=OFF'
+@endcode
+-#  In git command line enter the following command :
+@code{.bash}
+./installTesseract.sh
+@endcode
+-# now we need the language files from tesseract. either clone https://github.com/tesseract-ocr/tessdata, or copy only those language files you need to a folder (example c:\\lib\\install\\tesseract\\tessdata). If you don't want to add a new folder you must copy language file in same folder than your executable
+-# if you created a new folder, then you must add a new variable, TESSDATA_PREFIX with the value c:\\lib\\install\\tessdata to your system's environment
+-# add c:\\Lib\\install\\leptonica\\bin and c:\\Lib\\install\\tesseract\\bin to your PATH environment. If you don't want to modify the PATH then copy tesseract400.dll and leptonica-1.74.4.dll to the same folder than your exe file.
\ No newline at end of file

modules/text/tutorials/table_of_content_text.markdown

+Text module {#tutorial_table_of_content_text}
+=====================
+
+-   @subpage tutorial_install_tesseract
+
+    *Compatibility:* \> OpenCV 3.4
+
+    *Author:* Laurent Berger
+
+    Instructions in order to properly setup tesseract on windows for the text module.