Spatial cutoff frequency

Spatial cutoff frequency is like a measure of how much detail you can see in a picture or a scene. Imagine you're looking at a really big picture or a really wide view of something. Your eyes can only see so much detail. If there's too much detail, it becomes hard to see anything clearly. That's what spatial cutoff frequency is all about.

When you take a picture or look at a scene, it's made up of lots of tiny shapes and lines. When you zoom in, you can see each of these tiny details more clearly. But if you zoom in too far, the details become too small for your eyes to see clearly.

Spatial cutoff frequency measures the point at which the details in a picture or scene become too small for your eyes to see. It's like a line that separates the parts of the picture you can see clearly from the parts that are too detailed for your eyes to make out.

So, if you imagine a painting of a forest, there might be lots of tiny leaves on the trees or blades of grass on the ground. If you stand back from the painting, you can still tell that there are leaves and grass, but you can't see the details of each individual one. That's the spatial cutoff frequency at work. It's the point at which the details become too small to make out clearly.