Online last round: Started with a presentation of my previous relative experience and follow up questions about the presentation as well as a few statistical related questions for image processing. Also a few questions about very details of c++ data structures. And one irrelevant question about how many bytes in a float or double variable, which you might or might not remember off the top of your head. They were polite and professional. Followed up after a few days and got a rejection without any details or feedback on the last round of interview.