On Mon 03-Jan-2011 at 10:49 -0800, Daniel M. German wrote:
...and abandon the a,b,c polynomial while we are at it. There are
definitely better lens models, the question is do we need the pain involved
with changing from the existing model?
We can leave it as is, and provide a better model, but what would the
alternatives be?
It has been pointed out that the polynomial should only consist of
even numbered powers, both for speed and for mathematical soundness.
The distortion could be a function of angle and not proportion of
width of image. This would make discussions about whether to use
diagonal, width or height irrelevant. Also a single lens would have
the same parameters regardless of sensor size.
Tom Sharpless wrote a system that used a spline rather than a
polynomial curve, this is what is implemented in calibrate_lens. In
principle this would be more stable when optimising and faster when
rendering.
--
Bruno
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