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Idea for noise-free images at any ISO

Started Apr 15, 2012 | Discussions thread
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Idea for noise-free images at any ISO
Apr 15, 2012

When I woke up this morning and was still groggy, I had an idea for an image-processing algorithm that would allow noise-free images at any ISO. Since I'm not an image-processing specialist, and many people much more intelligent than I am are, I wonder what's wrong with the following:

Using a tripod, take multiple images of the scene at some arbitrarily-high ISO. Since sensor noise is random but the information in the scene is not, shouldn't it be relatively simple to use a computer program to distinguish between the two? Data that varies among each of the images is noise; data that remains the same between multiple images is signal. Remove the noise to create a combined image that would be clean at any ISO.

Assuming this is relatively obvious, and it hasn't been implemented, what's wrong with this idea?

Just curious.
Kyoto, Japan

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