I would like to specialize in image and video processing. Which library is better for signal processing, Intel IPP or OpenCV? What are the differences between them?
For me it does not seem like an either-or situation.
You can check the differences and how they work together right from the Intel guys.
For some of us it might matter that while OpenCV is free, IPP is not. (When I checked a license was ~$200.) However it covers areas other than image/video processing (it also covers sound processing and cryptography for example).