Quote from: mlrocks on July 19, 2021, 07:28:26 PMCan a photographer use a 30 mp high resolution camera to take a perfectly clear and detailed image without any blur when the camera is moving and when the subject is moving? If not, why bother with such a high resolution camera?
I do agree with the thrust of your argument (diminishing returns). A couple of counterpoints:
I haven't looked into the extent to which motion blur annuls gains in resolution, but it's at least plausible that a streaking point looks better than a streaking blob by as much as a point looks better than a blob. By analogy in the world of stills, an astrophotographer capturing a star streak still cares about resolution. If we're talking about a truly Parkinsonian cameraman or Jason Bourne fight scene, it may be another matter.
Even if that isn't the case, we should probably be careful of overestimating the proportion of scenes affected by motion blur. In the experimental stuff I film and watch, it's pretty low. Elsewhere, scenes in which both foreground and background are both blurred are firmly in the minority (at least according to this viewer). Just having one element that is static is enough to lend the impression of overall detail to a scene, whence the value of sufficient resolution. Even brief moments of stillness in an otherwise movement-filled scene can give this impression.
As for whether a "debinning" algorithm can produce gains qualitatively different from those of a scaling algorithm, I'll have to defer to someone more knowledgeable than I. Since the binning occurs at the analogue level (see the fantastic thread on pixel binning patterns in LiveView---https://www.magiclantern.fm/forum/index.php?topic=16516.0), you are presumably talking about some kind of rebayering, followed by a second debayering step. Whether or not this would (or could) be non-zero sum, I don't know.