[PyQt] PyQt and image processing

[Laura X]

Dear PyQt experts,

I am choosing a GUI toolkit for developing an application
(cross-platform) and PyQt seems to be simpler/more-intuitive for
programming than others. My application will have some basic image
processing (transformations, filtering, pattern recognition (e.g.,
with convolution), etc., but nothing complex) and some
drawing/painting on image stuff (I am also interested in playing an
AVI movie and transform each frame in single image inside my
application).

Pardon my ignorance but searching on the internet I was unable to find
examples of applications or descriptions of these functionalities in
PyQt.

I saw that PyQt has some nice built in functions for more basic image
processing but nothing on filtering and pattern recognition (e.g.,
with convolution).
It would be OK if I could use PIL or OpenCV for these stuff but it
seems the PIL integration in PyQt is somewhat limited or at least the
image conversion is too slow and there is nothing on OpenCV.

So, are there PyQt applications/examples on image processing? Using
PIL or OpenCV? Is it possible to load an AVI file and process the data
in PyQt?
Of course I understand that if there aren't good app's this does not
mean it is not possible to develop, but I want to learn with the
experience from others.

Thanks

Laura