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Author Topic: Alignment problem with static tripod and turnable model  (Read 4417 times)

CorentArt

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Alignment problem with static tripod and turnable model
« on: October 17, 2016, 12:06:55 AM »
hi!

i take lot photo of my object with my turnable setup .

When I want aligned photos I have this result:

http://prntscr.com/cv54ej


http://prntscr.com/cv54nk

someone can help me?

ekbmuts

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Re: Alignment problem with static tripod and turnable model
« Reply #1 on: October 17, 2016, 01:29:20 AM »
CorentArt, Yes - I can help you.

I believe you need to mask your images.

This is easier and quicker than it sounds.

In each image, use the "Intelligent Scissors" tool and draw a box around the subject.  This can be loose.  It does not have to be precisely lined up with the edge of your subject.  Subject = that thing that you are trying to make a model out of.

Do this with each and every image. That should take about 10 seconds per image.

Then, in the "Photos" pane, switch to "mask" view.  You do this by pressing the blue button at the top of the photos pane that looks like a square donut (for lack of a better comparison).  You photos will switch to black and white images.

Right-click on one of these images and select "Invert Masks".  A dialog box will pop up.  Select "All Cameras" and then hit "Okay."

Now align the images again making sure that you select "Constrain features by mask" in the "Align Photos" dialog box.

If all goes according to plan and this was indeed the reason for your poor alignment, you will now have a sparse point cloud that roughly resembles your model and from which you can proceed to make a model.

The rule is that if your camera is static and there your background is unchanging, you must mask for Photoscan to be able to align.

Good luck with this.

Jon

CorentArt

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Re: Alignment problem with static tripod and turnable model
« Reply #2 on: October 17, 2016, 03:11:09 AM »
hi Jon, thanks for your reply.

I have same result ..

http://prntscr.com/cv6wfn

http://prntscr.com/cv6wxu

I want to die , i don't know why i have this result...

ekbmuts

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Re: Alignment problem with static tripod and turnable model
« Reply #3 on: October 17, 2016, 05:35:43 AM »
CorentArt,  Hmmm...  Don't despair!  I think everyone goes through this.

Are you sure that you told Photoscan to recognize those masks?  That would be in the Align Images dialog, in the Advanced section (you have to click on an arrow to see the advanced settings), under "Constrain Features by Mask".

Check that first and tell me what you find.

Jon

CorentArt

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Re: Alignment problem with static tripod and turnable model
« Reply #4 on: October 17, 2016, 01:10:37 PM »
i love you !!!!!

Thank you! The compartment was not marked!

thank you so much!!!!

http://prntscr.com/cvbmi5

PatrickSirk

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Re: Alignment problem with static tripod and turnable model
« Reply #5 on: October 17, 2016, 09:04:40 PM »
Although I have not tried this yet, I saw it demonstrated successfully.  The method is to shoot an image first without the rock in place.  Just shoot the background under the exact conditions but without the rock.  Then proceed shooting.  When you do your alignment, import that "blank" image as a mask.  You repeat this for ever "row" of shots.

Saves endless time.  I repeat though, I have not tried it myself.

Patrick Sirk

ekbmuts

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Re: Alignment problem with static tripod and turnable model
« Reply #6 on: October 17, 2016, 11:37:56 PM »
CorentArt,  You're very welcome!

What Patrick is saying is also a valid method of masking.  The only drawback I have found is that sometimes the masks are not complete.

This method of hand-drawing in a rough mask I have found to be quicker and more effective.  But it's a point of personal preference.  You may try other masking methods that Photoscan offers and find any one of them to suit your workflow.

But that's great that you're off and running!

Bonne chance!

Jon