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Archive 2013 · Panorama Stitching Challenge
  
 
Mr Joe
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p.1 #1 · Panorama Stitching Challenge


The 8-shot panorama below features telephone lines that are not stitching correctly in Photoshop CS6 or PTGui 9 with the standard software settings. The images were shot with an 18mm Olympus lens mounted vertically on a 5D Mark II. The camera was on a nodal slide, but the lines moved during the long exposures. Here is a folder with a zip file that has 2000x3000 jpeg versions of all 8 images (33MB): http://dl.dropbox.com/u/106817539/pano_challenge.zip

Do you have a good panorama stitching technique for correcting parallax error in long sections of telephone wires? The warp tool and masking in Photoshop is too tedious. There has to be a better way. Thanks for taking the time to give this stitch a try -- I'll be curious to see if anyone has a good way to fix the wires!







Edited on Feb 24, 2013 at 06:51 PM · View previous versions



Feb 19, 2013 at 01:26 AM
Hammy
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p.1 #2 · Panorama Stitching Challenge


Looks like a prime candidate for either something like the healing brush or content aware (scale is what I'm thinking, but not right) - that will take out the poles and the wire pretty easily... I think.


Feb 19, 2013 at 02:06 AM
Mr Joe
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p.1 #3 · Panorama Stitching Challenge


@Hammy - I don't want to remove the wires -- I want to make them line up without having to spend an afternoon warping them.


Feb 19, 2013 at 02:09 AM
wbrad
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p.1 #4 · Panorama Stitching Challenge


Looks to me like you have four warps to do and you're all set. It doesn't really take that long in my experience, and I really can't see any other way around it. I might have a shot at this later when I've got some time.
Sorry if I'm not very helpful... Interesting shot, btw.

Wayne



Feb 19, 2013 at 02:32 AM
Jeffrey
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p.1 #5 · Panorama Stitching Challenge


Why?


Feb 19, 2013 at 03:32 AM
Mr Joe
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p.1 #6 · Panorama Stitching Challenge


@wbrad - I've tried warping and cloning. In order to get the angles to be convincing, it would take a long time. But maybe someone has a better, faster, stronger warping or cloning technique to solve this issue?

@Jeffrey - I'm guessing you're asking why keep the power lines? Simple -- I like the arc of the lines through the sky, and I don't have any problem with infrastructure being in my photos. That being said, I want to keep this thread focused on solving the problem, and not turn this into a discussion of aesthetics.



Feb 19, 2013 at 03:51 AM
 

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wbrad
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p.1 #7 · Panorama Stitching Challenge


I've made a quick little diagram to show how I usually handle an issue like this. The outlines show the three areas I would select, then I would actually use 'distort', not 'warp', in the directions shown. Then I use the history brush to clean up around each selection, and a little bit of cloning to patch up any imperfections in the joins.
I can usually manage seamless repairs in a few minutes.

Wayne









Feb 19, 2013 at 05:14 AM
Eyeball
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p.1 #8 · Panorama Stitching Challenge


If all you want to do is correct the discontinuities in the power lines, I suggest giving Puppet Warp a shot.

1. Do a copy merge of a section of the power line up to the break. You want to select a long enough piece of the line that the slight change in direction won't be noticed.
2. Paste to a new layer.
3. Do an Edit>Puppet Warp on the layer with the piece of power line. Select a pivot point at each end of the segment as close to the line as possible.
4. Move the end of the line to eliminate the discontinuity.
5. Accept the Puppet Warp change.
6. Use a quick clone edit to remove any fuzziness around where the line connects.

Here is a snapshot of the Puppet Warp edit just prior to moving the endpoint:









Feb 19, 2013 at 12:30 PM
Bernie
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p.1 #9 · Panorama Stitching Challenge


I've had pretty good luck with PS by stitching shots in groups. This pano gave problems connecting the single strand of barbed wire -- shot on a standard tripod. If I recall, I started with the middle 3 shots and then kept adding to each end. I still ended up with some minor misalignment that could be handled with Eyeball's puppet warp.

It also helps to have some vegetation....

No problems getting this set to match up....



Feb 19, 2013 at 04:36 PM
Mr Joe
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p.1 #10 · Panorama Stitching Challenge


@wbrad - thanks. I'll try distort and see if that helps.

@Eyeball - I didn't think of puppet warp. Appreciate the clear instructions -- this looks like a solid technique.

@Bernie - Stitching in sections is an interesting idea. I'll see if the algorithm gets any smarter when there's less work to do.



Feb 19, 2013 at 06:16 PM
papageno
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p.1 #11 · Panorama Stitching Challenge


Make the pano as a layered file. Then, starting with the topmost layer and working down through the pile, try adding selective masking. usually you can find a spot where everything aligns. Sometimes a nudge on the layer with liquify is also useful.

Distorting the layers often creates problems elsewhere in the overlap.



Feb 24, 2013 at 03:14 AM
Mr Joe
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p.1 #12 · Panorama Stitching Challenge


@papageno - due to the wires moving during the long exposures, simple masking won't fix the issue. The puppet warp technique above worked really well though!


Feb 24, 2013 at 06:48 PM





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