The KWIVER toolkit is a collection of software tools designed to tackle challenging image and video analysis problems and other related challenges. Recently started by Kitware’s Computer Vision and Scientific Visualization teams, KWIVER is an ongoing effort to transition technology developed over multiple years to the open source domain to further research, collaboration, and product development. KWIVER is a collection of C++ libraries with C and Python bindings and uses an permissive BSD License.

One of the primary design goals of KWIVER is to make it easier to pull together algorithms from a wide variety of third-party, open source image and video processing projects and integrate them into highly modular, run-time configurable systems.

For more information on how KWIVER achieves this goal, and how to use KWIVER visit our documentation site.

Below is a summary of the key directories in KWIVER and a brief summary of the content they contain.

Kitware maintains a Docker image with KWIVER prebuilt. The Dockerfile used to build the image can be found here.

Pull the image from Dockerhub:

"docker pull kitware/kwiver:latest" (latest master)

"docker pull kitware/kwiver:release" (latest release)

"docker pull kitware/kwiver:1.6.0" (static release)

(https://hub.docker.com/r/kitware/kwiver)

or build the KWIVER image using the dockerfile:

"docker build -t kwiver:tagname ."

KWIVER, especially Arrows, has a number of dependencies on 3rd party open source libraries. Most of these dependencies are optional but useful in practice, and the number of dependencies is expected to grow as we expand Arrows.

Vital has minimal required dependencies (only Eigen). Sprokit additionally relies on Boost. C++ tests additionally rely on Google Test. Arrows and Sprokit processes are structured so that the code that depends on an external package is in a directory with the major dependency name (e.g. vxl, ocv). The dependencies can be turned ON or OFF through CMake variables.

To make it easier to build KWIVER, especially on systems like Microsoft Windows that do not have package manager, Fletch was developed to gather, configure and build dependent packages for use with KWIVER. Fletch is a CMake_ based "super-build" that takes care of most of the build details for you.

For building Fletch, refer to the README file in that repository.

You may run CMake directly from a shell or cmd window. On unix systems, the ccmake tool allows for interactive selection of CMake options. Available for all platforms, the CMake GUI can set the source and build directories, options, "Configure" and "Generate" the build files all with the click of a few buttons.

We recommend building KWIVER out of the source directory to prevent mixing source files with compiled products. Create a build directory in parallel with the KWIVER source directory for each desired configuration. For example:

The following are the most important CMake configuration options for KWIVER:

There are many more options. Specifically, there are numerous options for third-party projects prefixed with KWIVER_ENABLE_ that enable building the Arrows plugins that depend on those projects. When building with the support of Fletch (set fletch_DIR) the enable options for packages built by Fletch should be turned on by default. The fletch_DIR is the fletch build directory root, which contains the fletchConfig.cmake file.

The following sections will walk you through the basic options for a minimal KWIVER build.

Note, This assumes your fletch was built with python support (Turn OFF if not).

You will also need to replace the fletch path with your own:

$ cmake </path/to/kwiver/source> -DCMAKE_BUILD_TYPE=Release \
        -Dfletch_DIR:PATH=<path/to/fletch/build/dir> \
        -DKWIVER_ENABLE_ARROWS:BOOL=ON -DKWIVER_ENABLE_C_BINDINGS:BOOL=ON \
        -DKWIVER_ENABLE_EXTRAS:BOOL=ON -DKWIVER_ENABLE_LOG4CPLUS:BOOL=ON \
        -DKWIVER_ENABLE_PROCESSES:BOOL=ON -DKWIVER_ENABLE_PYTHON:BOOL=ON \
        -DKWIVER_ENABLE_SPROKIT:BOOL=ON -DKWIVER_ENABLE_TOOLS:BOOL=ON \
        -DKWIVER_ENABLE_EXAMPLES:BOOL=ON -DKWIVER_USE_BUILD_TREE:BOOL=ON

When first configuring a KWIVER build with ccmake it is preferable to set the build configuration and fletch_DIR on the command line like this:

$ ccmake /path/to/kwiver/source -DCMAKE_BUILD_TYPE=Release -Dfletch_DIR=/path/to/fletch/install

Other CMake options can also be passed on the command line in this way if desired. Follow the recommended options setup using the CMake GUI.

When running the cmake gui, we recommend selecting the 'Grouped' and 'Advanced' options to better organize the options available. Note, after clicking the configuration button, new options will be highlighted in the red sections.

1. Once the source code and build directories are set, press the 'Configuration' button and select your compiler
   1. Configuration will fail, but now we can set option values
2. Set the fletch_DIR, the CMAKE_BUILD_TYPE, and these KWIVER options, and press the 'Configuration' button
   1. Note, if compiling with MSVC, you will not have a CMAKE_BUILD_TYPE option

3. Select these new options, and click 'Generate'
   1. This assumes your fletch was built with python support. If not, do not check this option

Once your CMake generation has completed and created the build files, compile in the standard way for your build environment. On Linux this is typically running make.

There is also a build target, INSTALL. This target will build all code, then create an install directory inside the build directory. This install folder will be populated with all binaries, libraries, headers, and other files you will need to develop your application with KWIVER. MSVC users, note that this install directory is for a single build configuration; there will not be configuration named directories in this directory structure (i.e. no /bin/release, only /bin).

Once you've built KWIVER, you'll want to test that it's working on your system. Change your terminal/command prompt to the KWIVER CMake build directory. From a command prompt execute the following command:

# via a bash shell
$ cd <path/to/kwiver/build>
$ source setup_KWIVER.sh
#
# via a windows cmd prompt
> cd <path/to/kwiver/build>
> setup_KWIVER.bat

This will set up your PATH, PYTHONPATH and other environment variables to allow KWIVER to work conveniently within in the shell/cmd window.

You can run this simple pipeline to ensure your system is configured properly:

# via a bash shell
$ cd bin
$ kwiver runner ../examples/pipelines/number_flow.pipe
#
# on windows, you will need to also be in the configuration folder
> cd bin\release
> kwiver runner ..\..\examples\pipelines\number_flow.pipe

This will generate a 'numbers.txt' file in the </path/to/kwiver/build>/examples/pipelines/output directory.

More examples can be found in our tutorials.

Here are some applications using KWIVER that serve as an example of how to leverage KWIVER for a specific application:

Continuous integration testing is provided by CDash. Our KWIVER dashboard hosts nightly build and test results across multiple platforms including Windows, Mac, and Linux.

Anyone can contribute a build to this dashboard using the dashboard script provided. Follow the instructions in the comments.

For details on how to contribute to KWIVER, including code style and branch naming conventions, please read CONTRIBUTING.rst.

Please join the kwiver-users mailing list to discuss KWIVER or to ask for help with using KWIVER. For less frequent announcements about KWIVER and projects built on KWIVER, please join the kwiver-announce mailing list.

The authors would like to thank AFRL/Sensors Directorate for their support of this work via SBIR Contract FA8650-14-C-1820. The portions of this work funded by the above contract are approved for public release via case number 88ABW-2017-2725.

The authors would like to thank IARPA for their support of this work via the DIVA program.

The authors would like to thank NOAA for their support of this work via the NOAA Fisheries Strategic Initiative on Automated Image Analysis.