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1D Barcode support

* init barcode interface.

* barcode: update readme.

* now it is just interface, do not need CMakeLists to compiler it.

Signed-off-by: Killer_Quinn <>

* fix-trailing whitespace of docs-build.

Signed-off-by: Killer_Quinn <>

* Branch: Barcode-Support,replace vector<RotateRect> to vector<vector<Point2f>>,
barcodeDirectly now just output one string,
this commit is still only contain interface, barcode module will not be compile.

Signed-off-by: Killer_Quinn <>

* add implementation details

* fix doc bug

* not generate python bindings temporarily

* add barcode group for doxygen

* generate python bindings and improve performance

* remove win10 build warnings in detect stage

* remove win10 build warnings on decode stage

* add samples and accuracy tests

* Update

* add tutorial, part of content is to be done.

* add decode and EAN part in tutorial

* refactor imports

* delete decodeDirectly api for simplicity

* add super resolution and optimize code format

* Use @snippet / @include doxygen statements for embedding code from .cpp files

* improve decoding performance

* optimize code and slightly improve the performance

* add ean8 support

* add references and use uint type for some non-negative variables

* support java bindings

* optimize wording in source code and documentation

* refine code

* whitespace

* bugfix: forget to clear list

Co-authored-by: darkliang <>
Co-authored-by: WangberlinT <>
Co-authored-by: Junhao Liang <>

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Repository for OpenCV's extra modules

This repository is intended for the development of so-called "extra" modules, contributed functionality. New modules quite often do not have stable API, and they are not well-tested. Thus, they shouldn't be released as a part of official OpenCV distribution, since the library maintains binary compatibility, and tries to provide decent performance and stability.

So, all the new modules should be developed separately, and published in the opencv_contrib repository at first. Later, when the module matures and gains popularity, it is moved to the central OpenCV repository, and the development team provides production-quality support for this module.

How to build OpenCV with extra modules

You can build OpenCV, so it will include the modules from this repository. Contrib modules are under constant development and it is recommended to use them alongside the master branch or latest releases of OpenCV.

Here is the CMake command for you:

$ cd <opencv_build_directory>
$ cmake -DOPENCV_EXTRA_MODULES_PATH=<opencv_contrib>/modules <opencv_source_directory>
$ make -j5

As the result, OpenCV will be built in the <opencv_build_directory> with all modules from opencv_contrib repository. If you don't want all of the modules, use CMake's BUILD_opencv_* options. Like in this example:

$ cmake -DOPENCV_EXTRA_MODULES_PATH=<opencv_contrib>/modules -DBUILD_opencv_legacy=OFF <opencv_source_directory>

If you also want to build the samples from the "samples" folder of each module, also include the "-DBUILD_EXAMPLES=ON" option.

If you prefer using the gui version of cmake (cmake-gui), then, you can add opencv_contrib modules within opencv core by doing the following:

  1. Start cmake-gui.

  2. Select the opencv source code folder and the folder where binaries will be built (the 2 upper forms of the interface).

  3. Press the configure button. You will see all the opencv build parameters in the central interface.

  4. Browse the parameters and look for the form called OPENCV_EXTRA_MODULES_PATH (use the search form to focus rapidly on it).

  5. Complete this OPENCV_EXTRA_MODULES_PATH by the proper pathname to the <opencv_contrib>/modules value using its browse button.

  6. Press the configure button followed by the generate button (the first time, you will be asked which makefile style to use).

  7. Build the opencv core with the method you chose (make and make install if you chose Unix makefile at step 6).

  8. To run, linker flags to contrib modules will need to be added to use them in your code/IDE. For example to use the aruco module, "-lopencv_aruco" flag will be added.

Update the repository documentation

In order to keep a clean overview containing all contributed modules, the following files need to be created/adapted:

  1. Update the file under the modules folder. Here, you add your model with a single line description.

  2. Add a inside your own module folder. This README explains which functionality (separate functions) is available, links to the corresponding samples and explains in somewhat more detail what the module is expected to do. If any extra requirements are needed to build the module without problems, add them here also.