There are several web articles on the topic, but, after having read them, I still don't know what "energy" is, in the context of computer vision (CV) and image processing (IP). It is related to optimisation, given that, apparently, there are the so-called "energy minimisation problems".
Why is it called "energy" (that is, why the word "energy")? I read it is because it is related to the concept of "energy" in physics, but assume that I have no idea of what energy in physics is. How would you explain what energy is in IP and CV? What is the intuition behind it?
Why do we care about energy? Given that there are the energy minimisation problems, we want to minimise energy, in such cases. I have also read that there are energy maximisation problems, so sometimes we also want to maximise energy.
I have read that it has different meanings depending on the context, but I just want to know its meaning in image processing and computer vision, that is, in the context of images.