OpenCV, contours and caching

Question

Image processing

There is a task, it is necessary to compare one image and do the comparison through Xy moments. The database includes ~2000 images. It is logical to implement some kind of caching, when all these ~ 2000 images would be stored in the form of already processed data, and since the comparison will be made relatively often, it would be nice to keep this whole thing in memory. The objects themselves, on which the moments will be calculated, are quite simple, but I'm interested in how much such data takes up in memory. The answer is needed within a day, and I won’t be able to get to the experiments for the next 3 days.

I would be grateful for an answer or any information on this matter.