Demosaicing and bit dimensions

Started Nov 16, 2013 | Discussions thread
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John Sheehy Forum Pro • Posts: 17,926
Re: Demosaicing and bit dimensions

Mark Scott Abeln wrote:

OK, if we have a sensor that has, say, 16 megapixels, we expect that the final image produced also has 16 megapixels — one pixel per sensel, right?

While this seems common-sensical, are there practical mathematical reasons for a demosaicing algorithm to deliver another size, not mapping sensels to pixels 1:1? Not simply to resize, but because the it delivers superior results in one way or another?

I've though for about a decade now, that increasing the pixel resolution of the render would be beneficial with under-sampled lenses.  For example, any geometric distortion corrections, or CA corrections need more resolution to place the weighted edges in the right locations.  Doing CA correction in an under-sampling resolution requires either sporadic softening or increased aliasing to shift the color planes.

Of course, future sensor with high pixel densities would not benefit as much or at all, nor would current pixel densities at very high f-stops or with pinholes.  Most current digital photography under-samples lenses, though, in general.

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