This year I have two ideas for GSoC:
1) Image registration and blending for scikit-image library.
This is a complex project that involves adding a few cool vision algorithms to the library and than combining them to a photomontage framework.
You can find more information in the proposal:
2) High Dynamic Range imaging for OpenCV
It would also be great to continue working with HDR imaging and have it in OpenCV.
The implemented functionality can then be easily used in nomacs.