Do you think CV is one of the hardest branches of CS?

When I started, I was told that CV is mostly AI, and getting into it isn't that hard, but when I actually got into it, I found out how difficult this field is. You basically need knowledge in linear algebra, calculus, geometry, AI, Image Processing, Signal Processing, knowledge of how cameras operate, camera calibration, 3D domain, etc.

Don't get me wrong, I love the field, and I'm just wondering if it is just me who feels like this.

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