On Sun, Jan 02, 2011 at 09:37:00AM -0500, Yuval Levy wrote:
> > More room for scripting experiments. Let me just finish with a remark
> > I've made over and over: if your lens is well calibrated, you really
> > don't need that many CPs. Either you use a set with a great number of
> > CPs to calibrate your lens, or you have a well-calibrated lens and
> > only need the CPs to nudge your images in place. It shouldn't be
> > necessary at all to optimize lens parameters with every pano to 'bend'
> > the images to fit, and if you don't, what do you need so many CPs for?
>
> EXACTLY! Every time I see users coming back with thousands of CPs I wonder
> if
> this is another meaningless attempt to assemble the largest quantity of
> boring
> pixels or if it is an exercise in global warming by CPU strain.
>
> Theory is that three strategically placed CPs per image pair are enough when
> the lens is already calibrated. I work with five CPs per image pair, and for
> small projects (e.g. full sphericals with six fisheye shots) repeating the
> left-click-right-click dance on the CP tab is equally fast and yield better
> results than any CP generator I've tried before. A CP generator becomes
> useful only when dealing with a large number of input images.
But do you find this fulfilling work? Setting aside the fact that
you've become convinced that the algorithms of today generate worse
results than you, Wouldn't you prefer to have the computer do this
boring work for you?
You apparently do the "pano-with-six-fisheye-images" dance regularly.
Calibrating the lens and then just using that is much easier.
I have a zoomlens.
Focal lenght: 18-135mm
F-stop: f/2.0- f/32
focus: 1.5m - inf
So worst case I have to have a 3D matrix of lens calibration settings
for two analog and one digital parameter. (one of which doesn't go
into the exif data). I think that calibrating the lens on the current
project is a reasonable compromise.
Roger.
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