For David Millier

maple wrote:

Arvoj explained exactly what I wanted to, but much more clearly and plausibly with his good knowledge in science. As you requested, here is an image of the sort of pine needles Lin mentioned, as an example of what happened beyond Nyquist in real world scenarios:

The photo was taken with lens zoomed at 36mm fl. In memory, the pines trees were at least 50m away, but by reference to the size of the people that look about half way between the camera and the trees, it’s probably about 40m. For convenience sake, let’s say 36m, or 1000 times of the fl. So, the 5um pixel size of SD1M sensor covers 5mm at that distance, i.e., the sensor is capable of resolving line pairs no finer than 10mm in width that far. The pine needles, however, should be about 1-2mm in dia., and a high percentage of them are easily less than 10mm between each other. So we know they are largely beyond the capability of the sensor to resolve fully and truthfully.

Yet, we see pine needles, seemingly almost one by one. In theory much of these are just aliasing induced misinformation. In reality, they look vividly real.

Fine details and textures is everywhere in the real world: rock and timber surface, brick walls, foliage and grass in far field, human skins and fabrics up close, and what not. Pine needle is just one convenient example.

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Maple