How are multiple blur traces utilized in shake reduction?

I'm starting to get fairly comfortable with the new shake reduction tool in CC and the results are fantastic. It's already saved several old photos that I had given up on as hopelessly motion blurred. Now that I'm getting familiar with the tool though, I have a question. I know the tool allows for multiple blur traces to be created. How are they used, and won't they conflict with one another. If part of the image is more blurred than another, or blurred in a slightly different direction, won't the corrections applied from the blur trace determined by one part of the image actually further blur the parts of the image where that blur trace doesn't apply (and isn't the same true of the second trace then)? Anyone have any idea on how the tool handles multiple traces? Are they applied locally with diminishing effect as the distance from the measurement region increases? Are they applied in some other smart fashion? Any ideas? I'm very curious about this, as I see a lot of potential in the tool to save my bacon in the future.
Thanks,
Dave

Mylenium,
Thanks for the response. I think I'm reasonably comfortable with what's going on under the hood, but I'm still a little confused as to how the tool will work with multiple blur traces. I guess as a thought experiment I imagine the situation where the image has experienced rotational or arcing motion. If the calculations exist in the spatial frequency domain (Fourier space), then a circular deconvolution won't really be possible. In fact any blur with rotational symetry should be problemmatic to reverse (another example would be a radial blur) unless the image gets resampled in a non-rectangular fashion. So let's say there is an image that was slightly rotated so that the left hand side of the image experiences an arc shaped blur that looks like the left half of a circle, and the right side an arc that looks like the right side of a circle. The size of these arcs will increase with distance from the center of rotation. Is this simply a hopeless case where the blur trace that fixes the right side of the image negatively impacts the left side an visa versa, or is there some additional set of smarts at play when multiple blur traces are utilized? Is there a correlation function employed to optimize where a particular blur trace is used to deconvolve the blur function? Academically I'm interested in the algorithmic answer to that question, but from a more practical standpoint, I'm simply looking at how I use these multiple blur traces. Do I duplicate the layer apply one blur trace to one layer and another to another layer and then layer mask them together? If that's really the way to go, then what is the purpose of multiple blur traces? I guess I'm just really curious in the end. Thanks again for the response.
Dave

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