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Amit Dovev edited this page May 14, 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 (#53, #71, #124 and others).

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Old wiki - no longer maintained.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These wiki pages are no longer maintained.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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