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Amit D edited this page Nov 24, 2016 · 15 revisions

How to build Tesseract with OpenCL

Important note: OpenCL support in Tesseract is still considered experimental. There are some major bugs associated with it.

Building Tesseract on VS 2010 with OpenCL

  1. Open the Tesseract Visual Studio 2010 solution file under \tesseract-ocr\vs2010\tesseract.sln

  2. Select the required build configuration (LIB_DEBUG / LIB_RELEASE / DLL_DEBUG / DLL_RELEASE)

  3. Set up the OpenCL paths in “tesseract” project:

  • Right click on “tesseract” project and select Properties
  • Header file paths : Go to Configuration Properties -> C/C++ -> General -> Additional Include Directories. Add the directory path where OpenCL header files are located on the given machine. E.g: On a machine with AMD APP SDK installed, this path will be $(AMDAPPSDKROOT)include.
  • Library file path : Go to Configuration Properties -> Linker -> General -> Additional Library Directories. Add the directory path where OpenCL library file, OpenCL.lib is located on the given machine. E.g: On a machine with AMD APP SDK installed, this path will be $(AMDAPPSDKROOT)lib\x86.
  • Library reference : Go to Configuration Properties -> Linker -> Input -> Additional Dependencies. Add OpenCL.lib to the list of dependent libraries.
  • Preprocessor definition : Go to Configuration Properties -> C/C++ -> Preprocessor -> Preprocessor Definitions. Add USE_OPENCL to the list of preprocessor definitions list.

  1. Repeat the same steps as point 3 above to set OpenCL paths for “libtesseract” project

  2. Build and run the solution.

Building Tesseract on Linux with OpenCL

  1. Make sure you have installed OpenCL sdk and libtiff-dev
  2. The OpenCL header and library paths are currently defined by the variables OPENCL_HDR_PATH and OPENCL_LIB in configure.ac. These have to be set to the appropriate paths depending on the OpenCL installation.
  3. To build on Linux use
./configure --enable-opencl

or if you want to specified opencl include (/opt/AMDAPP/include/) and library (/opt/AMDAPP/lib/x86_64/) paths:

export LIBRARY_PATH=/opt/AMDAPP/lib/x86_64/:$LIBRARY_PATH
CPPFLAGS+=-I/opt/AMDAPP/include/ ./configure --enable-opencl

Old wiki - no longer maintained. The pages were moved, see the new documentation.

As of 02/02/2020

These wiki pages are no longer maintained.

All pages were moved to tesseract-ocr/tessdoc.

The latest documentation is available at https://tesseract-ocr.github.io/.

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