"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> "Bill Pragnell" <bil### [at] hotmailcom> wrote:
> > "Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> > > > > Maybe post some details of your difficulties, or if you'd like you can email
> > > > > me directly.
> >
> > Here's a pair of angular maps that demonstrate my issue (scaled down to 512x512,
> > but it's still evident). I've marked corresponding pixel locations with red
> > crosses.
> >
> > http://www.infradead.org/~wmp/angular_eg.png
> >
> > It's interesting, now I come to actually look at this in detail, it seems to be
> > most pronounced on the horizontal. This suggests to me that keeping the ball
> > more central will definitely help...
> >
> > Bill
>
> Actually, by the looks of it, I think that the technique I described may help
> for this as there does appear to be lopsided distortion in the rotated image,
> as I would expect from perspective distortion.  Give it a try, let me know if
> you need any help getting it to work.
> What is your ball size to distance ratio?
>
> -tgq

Have a look.  I attempted to deconstruct, unwrap, unrotate your images and apply
the technique I mentioned.  Its not perfect (and I didn't have the original
unrotated image to work with) but the distortion is far less noticeable.  I
added about ~4% to the angular map (+20 pixels to each side of a 1024X1024
image)

-tgq

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