I am having a issue with a question with regards to how spatial frequency and high contrast are related.
Explain how high contrast resolution of an imaging system may be expressed in terms of a spatial frequency, measured in units of line pairs per mm.
As I understand spatial frequency is the amount of line pairs that occur with in a given distance, and by line pairs I mean a pair of black and white lines, so one line pair would be one black line and one white line.
If I think of a normal photo being taken the the higher the spatial frequency the more detailed the image is, but how does the increased spatial frequency effect the contrast of the image?
I can only thing that this would have to do with the thickness of the black and white lines.
For example say I take and x-ray image and there is a high contrast with in that image i.e a calcification, then to show in detail the difference in contrast I assume that the white line would be slight thicker than the black, so the more line per mm would give and brighter more white look I.e high contrast than say compared to the surrounding tissue in which, the line would be more a thicker black than white, to give a greyer kind on tone.