PanoTools NG:
RE: FW: calibrating a lens/teleconverter combo using PTGui
Joergen Geerds 2007-Dec-31 20:28:45
i'm not sure if i follow completely, but i think you
are mixing regular control points with line control
points.
regular control points are in image pairs, image A is
left, image B is right, and you sent control points on
elements that are the same on each side.
line control points are to be set in the same image,
image A is left and image A is right, and then you
click on the beginning of a line in one side, and on
the end of a line of the other. usually vertical lines
are just fine, horizontals are rarely used.
i hope i understood your problem right, and then this
should solve your issue.
happy new year
joergen
--- Yoram Bernet <#removed#> wrote:
> OK -I think I got it. It seems that the mistake I
> made was by accepting the
> suggestions offered by PTGui for the 2nd CP of each
> pair. This time, I
> placed the second CP of each pair somewhere far away
> on what is supposed to
> be the same line - so - if the line I am trying to
> straighten is vertical -
> I'd place the first CP at say the top of the line
> (in the right pane) and
> the second of the pair at the bottom of the line (in
> the left pane).
>
>
>
> This leads me to the question - are straight line
> CPs processed in pairs
> (per the CP numbers that show up in the images)? Or
> - are they processed in
> sets (with all CPs that have the same line
> number/name in the 'Type' field
> on the table below the images members of a single
> set)? Is there a rule of
> thumb regarding where to designate the 2nd CP of
> each pair (clearly, very
> close causes problems - that's what caused the
> optimizer to say 'too good to
> be true').
>
>
>
> Fascinating.
>
>
>
> -----Original Message-----
> From: #removed#
> [mailto:#removed#] On
> Behalf Of Yoram Bernet
> Sent: Monday, December 31, 2007 10:29 AM
> To: 'Jim Watters'
> Cc: #removed#
> Subject: RE: FW: [PanoToolsNG] calibrating a
> lens/teleconverter combo using
> PTGui
>
>
>
> Thanks all for your help...
>
> So, Jim... I've followed your pointers here. I have
> the two images in the
> control point tab. I entered three series of points:
>
> 5 points on one line (type set to 'line 3')
> 5 on another line (type set to 'line 4')
> and 5 on the last line (type set to 'line 5').
>
> I ran the optimizer and got the report that the
> average control point
> distances are all '0' and that this is "too good to
> be true" :-). Also,
> FoV=39.12, a=3.02, b=7.789 and c=1.411.
>
> When I looked at the preview, my image was tiny,
> inverted and bore a strange
> resemblance to the source, yet had all sorts of
> weird lines swapped. Those
> lines that were identifiable were very straight.
>
> Could it be that I am setting CPs wrong?
>
> I set CPs by clicking in one pane, then accepting
> the PTGui suggestion for
> the other pane. I do this for five points along what
> should be a straight
> line, name them all 'line N', then move on to set
> the CPs for the next line.
>
> I'm baffled...
>
> Y
>
> -----Original Message-----
> From: Jim Watters [mailto:#removed#
> <mailto:jwatters%40photocreations.ca> ions.ca]
> Sent: Friday, December 28, 2007 6:22 PM
> To: Yoram Bernet
> Subject: Re: FW: [PanoToolsNG] calibrating a
> lens/teleconverter combo using
> PTGui
>
> On the Control Point tab you should have the same
> image on both the left
> and right.
> in the CP type drop down list you should have the
> option to choose "New
> Line (t3)"
> It should show up in the list of points on the right
> side as Line 3, if
> not right click on the type and correct using the
> pop-up menu.
> You need to add at least 4 points to make a line.
> To add points to a new line, change CP type to New
> Line (t4)
>
> Shift lenses are a little different to calibrate
> compared to others.
> The way panotools works you will end up will
> different values for
> different shifts if you do not modify the size of
> the image.
> One way to compensate for this is to create a canvas
> that is larger and
> place the image into the correct spot.
> See http://www.epaperpr
> <http://www.epaperpress.com/ptlens/> ess.com/ptlens/
> Shift lens
>
> I am pretty sure there is an article in the wiki
> that I can not find
> that has more up to date images.
>
> Best of luck. Give it a another try. Continue to
> post to the group with
> your questions.
>
> Jim
>
> Yoram Bernet wrote:
> >
> > Thanks Jim.
> >
> > I feel like I'm flying by the seat of my pants
> here. It may be that I
> > just need to spend a weekend reading more of the
> related documents in
> > further depth. In any case, here goes:
> >
> > In PTGui, menu - Tools | Options | Panotools
> > Ensure PTStitcher / Nora / PTMender application is
> correct.
> >
> > */[/**/Yoram Bernet/**/] /*
> >
> > */It was blank. I gave it the path to
> ptstitcher.exe but not sure if
> > this is right./*
> >
> >
> > In PTGui on Optimizer tab, Optimize using :
> "Panorama Tools Optimizer"
> >
> > If this does not work send me the images directly
> so I can see.
> >
> > */[/**/Yoram Bernet/**/] Here are the 2 guis (the
> first is the one I
> > have. The 2^nd is from the tutorial):/*
> >
> > *//*
> >
> > *//*
> >
> > I started out trying to derive the coefficients to
> calibrate a lens
> > combo. As an interim step, I'm just trying to take
> an image and
> > correct it based on a couple of known straight
> lines in the image. I'm
> > trying to do so by following Erik's tutorial
> > (http://erik-
>
<http://erik-krause.de/index.htm?./verzeichnung/distort_en.htm>
> krause.de/index.htm?./verzeichnung/distort_en.htm).
> >
> > If I need to just do a lot more studying before
> bugging you for help -
> > let me know. Regardles, I really appreciate your
> assistance. I'm about
> > to log off for the w/e.
> >
> > Happy New Year!
> >
> > Yoram
> >
> > Jim
> >
> > Yoram Bernet wrote:
> > > Erik and Jim Watters, thanks to you both.
> > >
> > >
> > >
> > > I'm still stuck. I am following the tutorial
> that Erik pointed me
> > towards.
> > > I've downloaded the latest pano12.dll that Jim
> pointed me towards
> > and yet I
> > > seem to have a substantially different version
> of the Gui than the
> > one in
>
=== message truncated ===
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