calculation of sampling rate of an image

Hello everyone,i have a doubt…. I know that for a given signal, the sampling frequency Fs must be twice or more than maximum frequency of the signal Fm. It is easy to understand the concept for a 1D signal. But I don’t know how to calculate sampling frequency or Nyquist rate for a multidimensional signal like 2D image.So can anybody help regarding it???

[Rohan Sanghavi]

I have the same doubt.

Kindly please help.