Most of the time you don't need pixel-level classification. Suppose you want to make a cat tracker. How small can you shrink an HD image and still reliably dete

Most of the time you don't need pixel-level classification. Suppose you want to make a cat tracker. How small can you shrink an HD image and still reliably detect a cat (using your own brain)? Pretty small. Probably less than a quarter of the size at least. Do you need colour? Often you can get away without it, so that's a third of the data gone too. For full-image classification you could go even smaller and still be accurate.