SimpleITK/GettingStarted

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SimpleITK provides a simplified interface to ITK in a variety of languages. You can either download binaries, if they are available for your platform and prefered language, or you can build SimpleITK yourself.

Additionally, there are several recommended third-party software packages.

After you have installed SimpleITK, please look to the Tutorial or the Doxygen pages for more information.

Downloading the binaries

One of the great advantages of SimpleITK is that (typically) you do not have to build it — you can simply download the binaries and get started right away!

Currently, "Python binaries are available on Windows, Linux and Mac OS X. C# and Java binaries are available for Windows. We are also working towards supporting R packaging.

Python binary files

The list of the binary Python packages available is maintained here.

Your versions of python, operating system, and architecture must be available to use a binary distribution. The package does not need to be downloaded from above, as SimpleITK is registered on the Python Packaging Index. The binary built packages are distributed as python eggs. They can be installed with the "easy_install" utility from the setuptools Python package.

If your system does not already have easy_install you will need to install the setuptools package to obtain it. Please go to the setuptools home page for detailed installation instructions.

Once you have installed setuptools, and easy_install is in your path, then run the following command as root to install the SimpleITK package in system's site-packages: 

$ sudo easy_install -U SimpleITK

This command will check the available packages and choose the most recent one that matches your system. Then it will download and install the python egg.

To install through a firewall proxy, the environment variable "http_proxy" may need to be configured. To pass the environment variable down through sudo, you need to use the "-E" option 

$ export http_proxy=http://someproxy.somewhere.com:8080
$ sudo -E easy_install -U SimpleITK


Advanced users may prefer to install SimpleITK in a virtual python environment, so that it does not modify the global python environment.


Please Note: "pip" does not work with our built eggs. We do have Python wheels available for manual download on SourceForge.

C# binary files

Binaries for select C# platform can be found on SimpleITK's SourceForge page. Installing the library should only involve importing the unzipped files into you C# environment. The files have the following naming convention: 

SimpleITK-version-CSharp-buildplatform-targetplatform.zip

eg. 

SimpleITK-0.8.0-CSharp-win32-x86.zip
SimpleITK-0.8.0-CSharp-win64-x64.zip

More information about getting started with a sample C# program can be found in A visual guide to building SimpleITK on Linux

Java binary files

Binaries for select Java platforms can be found on SimpleITK's SourceForge page. Installation instructions are available at a visual guide to SimpleITK in Java.

Build It Yourself

In many cases it is not required to build SimpleITK. The easiest way is to use the pre-compiled binary files (see above). However there are several reasons a user might prefer to build SimpleITK from source:

  • The binary files for your programming language of choice are not (yet) distributed
  • You want the live on the bleeding edge by using the latest-and-greatest version of SimpleITK
  • You want to wrap your own filters using the SimpleITK infrastructure
  • You want to contribute to the development of SimpleITK
  • To use the SimpleITK's C++ interface and/or use ITK directly

Prerequisites

To build SimpleITK you need:

  • A recent version of CMake >= 2.8.4
  • A supported compiler
  • To use the latest developmental version, source code can be downloaded with git >= 1.65
    • Git is required if building SimpleITK using "SuperBuild" (see below) to automatically download the matching version of ITK and SWIG
    • Windows users may prefer msysGit
  • Building the Python bindings requires the numpy and virtualenv packages.

Source code

There are two options to obtain the SimpleITK source code:

  1. Download a released version from the SimpleITK SourceForge page
  2. Download the latest development version using git
git clone --recursive  http://itk.org/SimpleITK.git

Building using SuperBuild

After downloading SimpleITK's source code we STRONGLY recommended to run cmake on the SuperBuild subdirectory of SimpleITK. Execute the following commands in the parent of the SimpleITK directory to configure the SuperBuild: 

mkdir SimpleITK-build
cd SimpleITK-build
cmake ../SimpleITK/SuperBuild

The SuperBuild will automatically download and build the matching version of ITK and SWIG needed to compile SimpleITK. Additionally, it will set recommended compilation flags to minimize the size of the library and enable support for large libraries. This is the recommended way to build SimpleITK and is easiest.

If you get an error message saying that ITK_DIR is not set then, you did not correctly point cmake to the SuperBuild sub-directory. Please erase your binary directory, and point cmake to the SimpleITK/SuperBuild sub-directory.

The cmake configuration process should automatically find supported languages and enable SimpleITK wrapping for them. To manually enable a language toggle the appropriate WRAP_LANGUAGE cmake variable to ON. Verify and/or correct the advanced cmake variables to the language specific executable, libraries and include directories. For example if you have multiple Python installations ensure that all related Python variable refer to the same versions.

Then use your make utility or your cmake chosen build utility to build SimpleITK.

SimpleITK takes a while to build. Some tips and tricks to speed up development time are listed here.

Building manually

This is not the recommended way of building SimpleITK, but it can be useful if you want to use a system version of ITK and/or SWIG, or if you do not want to (or can not) use git (due to firewall, etc).

  1. Setup the prerequisites as described above (i.e. CMake and supported compiler)
  2. Install the matching version of SWIG >= 2.0.9
  3. Download the SimpleITK source code from the SourceForge page
  4. Download the matching version of ITK
  5. Configure ITK using CMake
    • BUILD_EXAMPLES=OFF, BUILD_TESTING=OFF, BUILD_SHARED_LIBS=OFF, ITK_USE_REVIEW=ON, ITK_WRAP_*=OFF
  6. Build ITK
    • Be sure to note the build settings e.g. Release x64
  7. Configure SimpleITK using CMake
    • Set ITK_DIR to the location of the ITK build location from the previous steps
  8. Build SimpleITK
    • Be sure to configure the build settings exactly the same as ITK e.g. Release x64

Testing

After compilation the prudent thing to due is to test SimpleITK to ensure your build is stable and suitable for use and installation. The following commands execute the SimpleITK tests. 

cd SimpleITK-build/SimpleITK-build
ctest

On Windows you will need to specify configuration. Typically that would be the Release configuration, as such: 

cd SimpleITK-build/SimpleITK-build
ctest -C Release

If all tests fail, verify that you have the testing data in your source tree (the reason for the "--recursive" flag in the git command) AND that you have added the correct path to your *_LIBRARY_PATH.

Python installation

To install a built python package, as root: 

 cd SimpleITK-build/Wrapping
 python PythonPackage/setup.py install

If you enabled SimpleITK testing then there will be a Python egg in Wrapping/dist.

R installation

To install a built R package: 

 cd SimpleITK-build/Wrapping/Rpackaging
 R CMD INSTALL SimpleITK

This will install the R package "SimpleITK" in /usr/local as root or your local R installation directory.

A visual guide to building SimpleITK on Linux

A visual guide to building SimpleITK on Linux

Recommended Software

ImageJ

SimpleITK has a built in function, "itk::simple::Show()", which can be used for viewing images in an interactive session. Currently, this function by default Show invokes ImageJ to display images. ImageJ was chosen because it can handle all the image types that SimpleITK supports, even 3D vector images with n components.


We recommend downloading a recent version of ImageJ from the official home page. Recent versions come with support for the Nifti ( *.nii ) file format, which SimpleITK uses to export to ImageJ.


The Show function first searches the "PATH" environment variable, then additional standard locations, for most platforms are examined, if problems are encountered the correct path can be added to this environment variable.


Note: Linux installation requires an additional step. The Show function searches for an executable named ImageJ or imagej, however the default tarball does not come with this file. Instead it comes with a file names script. This file contains the installation instructions. In short the file should be renamed to "imagej" and the site specific variables for the installation location, and java must be set. Also consider the "newwindow" variable... Do you really want a new instance of ImageJ launched each time you use Show? Lastly, as the installation instructions indicate, the imagej wrapper should be in your path.

ipython

If you are using python, ipython is terrific environment to perform interactive commands for image processing. With the addition of numpy and scipy, you'll have a powerful interactive environment.

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