PanoTools NG:
Re: best practise for straight line control points?
paul womack 2008-Nov-25 16:22:35
Jim Watters wrote:
> paul womack wrote:
>> I want the pano to be exactly square, so I need to set horizontal and vertical control points - of course, being a map, there are grid lines, ideally suited to placing such points.
>>
>> But what's best?
>>
> Horizontal and vertical control points are evaluated in single pairs.
> Their order does not matter. I would place them as far apart as possible.
You mean (in my example) a 1-5 pair would be good?
At one stage in my pano I had a square(ish) pano
with (what I can only describe) as severe barrel
distortion.
I assume I'd need at least horiz line controls
on 1-3 and 3-5 to control that, in addition to a 1-5
> For straight lines the first pair of points are compared to the other
> pairs of points. It is best to place the first pair of points as far
> apart as possible. Then add additional pair of points for that line.
>
> Straight line points are mostly a substitute when there is not enough
> detail to add normal points.
Sorry to confuse - I'm not using "ordinary" straight lines at all.
> To keep the result square it probably is only necessary to add 2 of both
> hor and vert lines. Three of each will not hurt. And only add the
> straight lines if there is not enough detail to add other points.
BugBear
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