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Author Topic: How to align unaligned or incorrectly aligned images?  (Read 2296 times)

BB

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How to align unaligned or incorrectly aligned images?
« on: April 16, 2023, 03:02:56 PM »
I have around 100 small objects that were captured with a turntable and have a low amount of images (60 each) and therefore the image alignment fails for them. I can however find features on the (correctly) aligned images that are also present on the unaligned/incorrectly aligned images, but I struggle to make it work. Even if I manually set markers on an aligned image and place those markers on the unaligned image, it still does not align when I rightclick and select "align image". What is the suggested workflow in such a situation?

I have uploaded an example to OneDrive: https://1drv.ms/f/s!ArVEPsEJZnREsOMcs1gd2ZBG5xlYLQ?e=8JNGuY
Image 3088 does not align even though I have marked four points that are also present on 3089.

tazzo

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Re: How to align unaligned or incorrectly aligned images?
« Reply #1 on: April 17, 2023, 12:16:10 AM »
Hello,
I only checked your images and:
- You have a lot of dust in your images, be sure to check the "Exclude stationary tie points" in the alignment options to get rid of it
- The object support is reflective, not ideal.
- The object support changed at some point. Not ideal too.

You can try to split in some chunks pictures with the same object support and then align them. A bit of masking will help too.

johnnokomis

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Re: How to align unaligned or incorrectly aligned images?
« Reply #2 on: April 17, 2023, 06:37:45 AM »
Ok I could say a lot about your photoset but I'll keep it short. I'm by no means an expert.

1) Try not to sneeze on your camera lens. Seriously wipe that dirty thing off. I can understand a few spots going unnoticed, but this lens is terrible.

2) More photos are needed. Especially on the edges where the two bigger sides aren't in frame.

3) Speaking of frame you should be closer to the subject. 60-75 percent of the photos are being masked out and useless.

4) Use a print out of detectable markers as your turntable pattern. I've attached a photo of mine as an example. It will help in the alignment. Just put the photos in a separate chunk every time you move the object.

I've also attached the camera.xml that you can import into your project. It's not perfect but you'll never achieve that with this current photoset. Good luck!

BB

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Re: How to align unaligned or incorrectly aligned images?
« Reply #3 on: April 23, 2023, 02:18:05 PM »
Yes, the setup is far from optimal and I appreciate your input. The images were created several years ago and I certainly would not do it this way as of today. Unfortunately, I do not have physical access anymore as the objects are located in another country and I won't have the opportunity to go there before the associated research project ends.
I will try the camera.xml you provided. What kind of changes did you do? I will also try to work with chunks. Any more insights in how I might get better results with the images/masks I have would be great as well.