SD15 Super-Resolution (double-width)

xpatUSA wrote:

tagscuderia wrote:

xpatUSA wrote:

Iconoscope wrote:

A fully automated software routine to combine the images would make this scheme more attractive!

Indeed it would! Doing it all "by hand" is quite tedious. Quite a learning curve too, especially if using several apps for the various stages of the procedure.

P.S. this multi-shot "Super Resolution" trick is primarily aimed at mitigating the CFA.

Are you sure?

Hmm...

I thought that was by moving the sensor by one pixel thereby getting 3 colors measured ar one location - whereas super-resolution involves fractional movements.

As I'm sure that you're aware, the Olympus Pixel Shift routine utilises 8 shots: 4 shifted by 1 pixel to mitigate the CFA, and then ½ pixel increments to boost spatial resolution. I first read about "superresolution" from Photo Acute so I thought that I'd re-read it's FAQ page and... I think that there are greater gains to be had for a CFA image; in part also because it reduces moire. But I guess that my original comment is wide of the mark.

Back when I was using an E-410, I wrote a command line tool ...

Windows "cmd" or a shell script?

cmd, used to use the command line a lot on Windows, macOS has turned me into a GUI slave.

... that:

1. upscaled (Bicubic to avoid aliasing, cannot recall the percentage)
2. aligned the images
3. averaged by mean
4. downscaled (Lanczos 3)

Cool.

From memory, the alignment tool was critical, I'll post if I remember it.

I would then manually sharpen using RL-D. So my final files were no larger, but the acuity was vastly improved despite only using 6 shots; that was the E-410's buffer before FPS dropped.

"RL-D" ... RawTherapee has it

With Foveon, we already have that per-pixel acuity so the only worthwhile gains would be noise related at which point a Median image stack is probably superior?

For noise, that should be true.

But at least this technique doesn't need a tripod, as mine doesn't get out much 

Interesting though!

My main interest in stacking is for the occasional focus job; much less for HDR (curves do well enough for that!).