2009/9/26 Brent
>
>
> I also experimented with varying d,e (it seems that letting them vary
> per-image doesn't help anything which is consistent with Pablo's
> explanation), and jointly optimizing with some of the lens parameters
> (a,b,c). In the latter case, the optimization usually fell ap
Ahh, I misinterpreted what you meant by multi-step optimization. I
can see how incrementally adding images can help out the minimization.
And I see what you mean about higher-dimensional solution spaces
having more local minima traps. Though minimizing a subset of the
variables with the other
Brent wrote:
> Pablo,
>Now that I think about it, there is something odd in the fact that
> doing a multi-step optimization by changing which variables are
> optimized works any better than a full optimization.
Maybe my explanation in the previous email was a bit misleading. What I
meant is
Pablo,
Now that I think about it, there is something odd in the fact that
doing a multi-step optimization by changing which variables are
optimized works any better than a full optimization. That is, if the
current solution is in a local minima with respect to 10 variables,
for example, then i
Hi Brent,
Brent schrieb:
> From a purely empirical point of view, it appears that there is some
> undesirable linkage between these parameters that makes the
> minimization process get trapped into local minima and have difficulty
> finding a solution in some cases.
I have had the same problem,
>
> The bottom line is that although I could eventually find a solution
> which seems good, I felt that the sensitivity to small changes in the
> optimizer's ability to find a good solution makes it difficult to
> solve the system and also makes it hard to know when the solution is
> good. It ma
>From a purely empirical point of view, it appears that there is some
undesirable linkage between these parameters that makes the
minimization process get trapped into local minima and have difficulty
finding a solution in some cases.
My basis for saying that is that I've been running some test c
Jim Watters schrieb:
> Pablo d'Angelo wrote:
>>
> If I understand correctly both models will align an image so it is on
> the same plane as others.
After some more reading of the code, I'm quite sure that the tilt can
only work well with rectilinear input images. If only that case is
intere
