In my project I need a wide vertical angle face detection.
So I used widerange lens, rotate camera at 90, and get suficcient vertical FOV.
Horizontal FOV could be reduced to about 1/3 of vertical, and is not matter.
So I set windowing to ROI:
And want to rotate image and use haar cascade…
So question was:
Which is the right and memory efficient way to rotate image (not truncating dimensions, I need to get for example 300x640 from 640x300).
Or, maybe there if a way to “rotate” haar cascade (standard “frontalface”)?