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I'm currently studying Zernike Moments, and came across the formula which is:

enter image description here

and it is said that $f(x,y)$ is a continuous image function that is mapped (inner product) onto the Zernike basis function $V_{nm}(p,\theta)dxdy$.

But I'm not entirely sure what does it mean by continuous image function. Is it just a mathematical way of saying images?

Maxxx
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    My best guess that an "image function" just a function which represents some image (so it's pretty much an arbitrary function), and that in this particular formula it has to be continuous. – Wojowu Sep 01 '19 at 13:19

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