What are the parameters of the object in the image?

Question

Image processing

What types of parameterization of an object by image exist for further classification of objects?
For example, parametrization by shape: the ratio of the area of ​​the object to the area of ​​the convex hull around the object. This is a fairly simple and easily implemented parameter.
What else is there and is used to classify objects.
I'm interested in the generalized parameters used for classification, and not specifically for my task. Therefore, I do not cite the classified objects.