Guides for Getting Started with Computer Vision, Deep Learning, and OpenCV

I'd used OpenCV with C++ in the past but this site is my go-to for OpenCV usage from Python, highly recommended!

Adrian's site is fantastic resource for OpenCV with Python.

I am not a huge fan of OpenCv itself though.

OpenCV is riddled with gotchas(ie this algorithm does not run out of the box because someone has patented it/trying to patent it).

I suppose the fault is not exactly with the library itself.

what is your alternative to opencv?

There really isn't a good one.

For heuristics(non ML) based stuff you could try BoofCV which is written in Java, so for Python there is a wrapper https://pypi.org/project/PyBoof/

I'm a huge fan of Adrian's opencv blog. His tutorials are awesome and go deeper than most. I highly recommend his book too.