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    <p>I haven't used SWIG or SIP, but I find writing Python wrappers with <a href="http://www.boost.org/doc/libs/1_35_0/libs/python/doc/index.html" rel="nofollow noreferrer">boost.python</a> to be very powerful and relatively easy to use.</p> <p>I'm not clear on what your requirements are for passing types between C/C++ and python, but you can do that easily by either exposing a C++ type to python, or by using a generic <a href="http://www.boost.org/doc/libs/1_35_0/libs/python/doc/v2/object.html" rel="nofollow noreferrer">boost::python::object</a> argument to your C++ API. You can also register converters to automatically convert python types to C++ types and vice versa.</p> <p>If you plan use boost.python, the <a href="http://www.boost.org/doc/libs/1_35_0/libs/python/doc/tutorial/doc/html/index.html" rel="nofollow noreferrer">tutorial</a> is a good place to start.</p> <p>I have implemented something somewhat similar to what you need. I have a C++ function that accepts a python function and an image as arguments, and applies the python function to each pixel in the image.</p> <pre><code>Image* unary(boost::python::object op, Image&amp; im) { Image* out = new Image(im.width(), im.height(), im.channels()); for(unsigned int i=0; i&lt;im.size(); i++) { (*out)[i] == extract&lt;float&gt;(op(im[i])); } return out; } </code></pre> <p>In this case, Image is a C++ object exposed to python (an image with float pixels), and op is a python defined function (or really any python object with a &#95;&#95;call&#95;&#95; attribute). You can then use this function as follows (assuming unary is located in the called image that also contains Image and a load function):</p> <pre><code>import image im = image.load('somefile.tiff') double_im = image.unary(lambda x: 2.0*x, im) </code></pre> <p>As for using arrays with boost, I personally haven't done this, but I know the functionality to expose arrays to python using boost is available - <a href="http://www.boost.org/doc/libs/1_35_0/libs/python/doc/v2/faq.html#question2" rel="nofollow noreferrer">this</a> might be helpful.</p>
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