A medical Image has a size of 8x8 inches. The sampling resolution is 5 cycles/mm. How many pixels are required? Will an image of size 256x256 be enough?
I know sampling in 1D signal but cannot get the intuition for a 2D image.
I first converted 5 cycles/mm to cycles/inch which came to be about 127 cycles/inch.
So as I understand it, this means we take 127 values for each inch of the input image and each of this is a pixel. So I figured for a 8x8 inch image, we would need
127*8x127*8 = 1016x1016 pixels
Am I right in my thinking or will Nyquist theorem have to be used?
Any kind of help is appreciated.