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Author Topic: Symmetrical Object Problem  (Read 4225 times)

chadt

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Symmetrical Object Problem
« on: August 05, 2015, 02:50:06 AM »
Hello

I am new to Photoscan and still in the process of learning how to get good scans. Right now I have a test object that is very symmetrical. Even though I have photographed it from many angles (all the way around multiple times) it keeps thinking all the cameras are on the same 2 sides of the object.

I tried to digitally color a few spots on the object to differentiate the sides to see if that would help jog Photoscan, but to no avail. Can someone take a look at these images to tell me how I could get Photoscan to correctly scan this object?

I'm using the standard version of Photoscan, not Pro.

Here are the images I'm using: http://files.chadtravis.com/Photoscn (The file is "Bag.7z.zip", after downloading remove the ".zip" from the name as it's actually a .7z file)

Thank you
« Last Edit: August 05, 2015, 12:24:16 PM by chadt »

Marcel

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Re: Symmetrical Object Problem
« Reply #1 on: August 05, 2015, 11:33:05 AM »
The link to your images is not working:

Quote
404 - File or directory not found.
The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.

chadt

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Re: Symmetrical Object Problem
« Reply #2 on: August 05, 2015, 12:15:41 PM »
Ah, it's a problem with my file server. I'll have to fix that later.
I think it's a problem with the file extension. Try downloading now, just remove the ".zip" from the filename, as it's actually a 7z file.
« Last Edit: August 05, 2015, 12:22:59 PM by chadt »

Alexey Pasumansky

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Re: Symmetrical Object Problem
« Reply #3 on: August 05, 2015, 02:41:55 PM »
Hello chadt,

It seems that the quality of the images doesn't allow to find sufficient number of feature points on the leather surface. Also there are blinks of the surface that are different of every image (depending on it's rotation angle) that also hardens the process of the feature detection and image matching process.
Best regards,
Alexey Pasumansky,
Agisoft LLC

chadt

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Re: Symmetrical Object Problem
« Reply #4 on: August 05, 2015, 02:48:18 PM »
Thanks for the response Alexey.


The problem is that it does a pretty good job at matching, and for one side of the object the poly comes out great, I just need it to realize that half the cameras should be on the other side.



chadt

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Re: Symmetrical Object Problem
« Reply #5 on: August 05, 2015, 02:55:03 PM »
Also, do you know a good way to reduce the amount of blinks (specularity?) on the surface?

(Though, I feel like, even if I had zero specularity I would still have the issue of symmetry.)

Alexey Pasumansky

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Re: Symmetrical Object Problem
« Reply #6 on: August 05, 2015, 03:02:26 PM »
Hello chadt,

If you switch to the Show Points option in 2D photo view mode, you will see that there are not so many matching points on the surface, and areas where the blinks are present do not contain feature points.

To reduce the blinks you can try using softer and diffuse lights.
Best regards,
Alexey Pasumansky,
Agisoft LLC

chadt

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Re: Symmetrical Object Problem
« Reply #7 on: August 05, 2015, 03:55:49 PM »
Thank you Alexey, I'll try again with softer and diffuse lights.