The techniques in that blog post are known since 10 years ago. In fact they are quite crude, as they don't account for other types of noise like readout noise, also it does not takes a map of individual pixel sensitivity taking "flat" frames.
Stacking pictures is the foundation of astrophotography and there are many free utilities that does this, for example:
BTW digital cameras already take a "black" frame and substract it from the "light" frame automatically, that's why sometimes the camera takes some time to show you a long-exposure picture: it's taking a black frame with the same exposure time.
I'm well aware of all these techniques. However, I'm looking for more flexibility, like the type I mentioned in my comment.
Something like auto focus stacking. The camera need not do the stacking - just automatically focus on various portions of the scene and take pictures. I can then stack on my computer. Currently I have to focus at one spot, take the picture, then focus on another, take the picture, etc. What I'd like to do is to specify the five focus points, and have it then do the rest of the work.
The in-built bracketing capability in cameras is really minimal.
I was looking at Magic Lantern, and it has a time lapse that essentially maintains a constant brightness - so when the day transitions into night, the camera auto-adjusts the exposure to make sure the subject does not become darker.
You make it sound like DSLRs do this automatically, which is not the case. My Nikon doesn't and my old Canon definitely had the option but didn't by default.
The techniques in that blog post are known since 10 years ago. In fact they are quite crude, as they don't account for other types of noise like readout noise, also it does not takes a map of individual pixel sensitivity taking "flat" frames.
Stacking pictures is the foundation of astrophotography and there are many free utilities that does this, for example:
http://deepskystacker.free.fr/
BTW digital cameras already take a "black" frame and substract it from the "light" frame automatically, that's why sometimes the camera takes some time to show you a long-exposure picture: it's taking a black frame with the same exposure time.