[ptx] vignetting function estimation

[JD Smith]

On Feb 5, 2006, at 3:32 PM, Pablo d'Angelo wrote:
>
> 2. Graphical display of vignetting correction polynomial.
> 3. Feature to optimize this polynomial based on the overlapping  
> images.
>    This function can only estimate the polynomial for the quotient  
> approach
>    right now.
>
>    I will post a tutorial on this later (in a week or two).

Very cool.  I look forward to trying it out.  One possibility for  
corrections which should be stable, especially these vignetting  
correction features, is to average many many results from different  
panos.  A possible means of doing this is to read/write a small file  
which just lists the parameters along with how many different values  
were averaged to arrive at them, and then allow users to "read and  
average" with the current fit.  Eventually the values averaged in  
this way should stabilize (assuming you don't mix focal length etc.).  
The user can obviously do this herself by hand as well, assuming the  
parameters are visible/available.

JD