tesseract_builder

This is just a repo for holding the precompiled binaries of tesseract for Windows. Following is the build process.

Installing prerequisites

• Install the latest version of cmake
• Create a new folder to place the compiled binaries of tesseract and its dependencies. Hereafterwards we will call this folder as <target folder>. For example this could be C:\work\tesseract_binaries.
• Here are the pre-requisites that we need to install to the above the <target folder>

Name	Repo link	version
zlib	https://github.com/madler/zlib	v1.3.1
libpng	https://github.com/pnggroup/libpng	v1.6.43
libtiff	https://gitlab.com/libtiff/libtiff.git	v4.6.0
libjpeg-turbo	https://github.com/libjpeg-turbo/libjpeg-turbo.git	3.0.3

Compile and install the above dependencies by the following the below steps for each of them seperately. Replace the , and with the values from the above table

git clone <Repo link>
cd <Name>
git checkout <version>
mkdir build64
cd build64
cmake -DCMAKE_INSTALL_PREFIX=<target folder> ..
cmake --build . --config RelWithDebInfo
cmake --install . --config RelWithDebInfo

• Add the path <target folder>\bin to the PATH environment variable. Open a new command prompt, follow rest of the steps.
• Now checkout and build leptonica, which depends on the above libraries

git clone https://github.com/danbloomberg/leptonica
cd leptonica
git checkout 1.84.1
mkdir build
cd build
cmake -DENABLE_GIF=OFF -DENABLE_JPEG=ON -DSW_BUILD=OFF -DENABLE_TIFF=ON -DENABLE_WEBP=OFF -DENABLE_OPENJPEG=OFF -DSTRICT_CONF=ON -DENABLE_PNG=ON -DCMAKE_INSTALL_PREFIX=<target folder> ..
cmake --build . --config RelWithDebInfo
cmake --install . --config RelWithDebInfo

• Now checkout and build tesseract, which depends on the above leptonica library

git clone https://github.com/get-wrecked/tesseract
cd tesseract
git checkout lstm_multi_thread
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=<target folder> -DSW_BUILD=OFF -DBUILD_TRAINING_TOOLS=OFF -DDISABLE_ARCHIVE=ON -DDISABLE_CURL=ON -DBUILD_SHARED_LIBS=ON ..
cmake --build . --config RelWithDebInfo
cmake --install . --config RelWithDebInfo

• Inside the target folder create a folder named tessdata and copy this file into it. https://github.com/tesseract-ocr/tessdata_fast/blob/main/eng.traineddata
• Inside the target folder create a folder name pdb and copy the following files into it. You can find the below files in one of the subfolders(usually named RelWithDebInfo) of the build or build64 folder of the corresponding repos.

jpeg62.pdb
libpng16.pdb
tesseract54.pdb
tiff.pdb
turbojpeg.pdb
zlib.pdb

• Now zip the contents of the target folder to create a pre-built binary package and upload it as a new release to this repo.