Is Photogrammetry Accurate? Using Agisoft Metashape to reverse engineer a scanned panel
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- เผยแพร่เมื่อ 13 ต.ค. 2019
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How accurate is Photogrammetry? Agisoft Metashape software
I scan a stamped aluminum paint panel and compare it to it's edge profile to see how accurate photogrammetry actually is. Photogrammetric processing of digital images and 3D spatial data generation.
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Next time, take a sharpie and put some random, easily visible black dots on the panel. That makes it a lot easier for the software to line things up correctly.
A tip for scaling the canvas. If you insert it and check the "make selectable" box, once its inserted, you can simply right click on the canvas, select calibrate, and choose 2 points on the canvas and set their distance in mm. Its basically exactly what youre doing, just a little faster I think, and a built in function.
Excellent breakdown Eric
Thanks 😊
Thanks for answering the question
I found your channel with your first Photogrammetry video, and my results have been accurate in a controlled environment. And this was with a 1080p security camera. I definitely required a lot more images with tighter angles to achieve a good scan, but the results were all the same.
Fantastic, glad to hear that. 😀 Thanks for your comment and support
Great video!
Great video! I noticed that the lense of your camera can create different results sometimes. Some lenses break the light in different ways, depending on how many physical much lenses it has, and can create a bent surface in the most unfortunate case later. (I myself am using a 55mm Zeiss lense which has very low error) In a good setup it should be fairly accurate though.
Nice video. Very informative. Mahalo for sharing! : )
Your welcome 😊
Tip for scaling the scan image in Fusion360. Attach canvas, rotate, scale only roughly, hit ok, on the left right click the canvas, select calibrate, select two points with a known distance an type in that distance, done ;) great video with some great information 👍
Great tip, thanks for that!
Thank you
Would have been nice if you had 3d printed part of the panel so you can compare if you have hit the dimensions right. I have wanted to do this with car panels, so that I can design car accessories.
ït s a great video thanks for the effort
I'm pleasantly surprised by the accuracy, especially when you consider possible distortions introduced by the camera lens. Photogrammetry software has come such a long way since I first looked into it 15ish years ago.
even 10 years ago, you scanned for aberrations in the lens. the better you get in it (even in 2010) the more accurate the output.
Eric, thanks for the great videos and ideas for rigs. I'm new to Agisoft Metashape. I've got a light box with an opening for the camera and I'm rotating the object but every time I try to align photos they are all from one position. The manual says to rename them camera station, which I've tried, shooting a low angle and a higher angle the same as you would with a drone around a building but using the turntable to rotate the object. I'm sure the solution is simple but would appreciate if you can help me. Thanks,
Don't know, since I use a different process, the soft ware is not meant to be used with a rotating object, I would reach out to agisoft and ask them. Best if luck. Thanks for your comment and support, much appreciated
Excellent !! Thanks a lot. I would like to know what kind of lens you use? I have a 30mm and an 18-05mm. How do I focus the object as well as possible? thanks again. you helped me a lot..!! greetings from Argentina.
Use autofocus, and set to the largest f stop
@@EricStrebel how we can set large fstop in autofocus mode
It would be interesting to laser cut a profile from the scan data and test it in the real world against the physical sample...
Does the error margin / tolerance increase with size of the object. Say a bicycle frame for example? I was trying to understand if this is a viable option to check the alignment of frames.
Dunno, good question
I have a 1:43 die cast model car that I plan to photogrammetry, radically modify and then 3D print. What I’ve learned is that there’s no software that allows one click to convert many photos to a solid to modify. The few I’ve seen require the results to be imported into the 3D app and traced. I’m looking for a workflow from photogrammetry to modify to print. Any app recommendations? Id want to use Shapr3d for edits.
Essentially you're correct the model you scan is basically something you can just use you will have to recreate it from that mesh, it will be merely a guide. Unfortunately I wish it was different. Perhaps there is someone who reads this that can shed some light on making this easier.
@@EricStrebel scanning and scaling just fine here. 600 to 900 photos. for diecasts... and a lot of patience with metashape. Glue the model on a pillar on 360 platform rotate and iphone away LOL move it to 3d program and create a new surface or solid. Everything fits 1st go.
Hey man, you can improve your results by putting some gluing stickers with "texture" on this plate. It does not have any detais on the surface, this difficults the life of some algorithms on photogrammetry pipeline
These stickers can also contain scalebars aswell
Thanks
i am asking a question , "can we print a calibration object to improves the accuracy of photogrametry nearly to microns?
Try it and find out, sounds like a good idea, but micron accuracy is a bit beyond what most industrial designers need
Have you tried Structured-Light photogrammetry? There’s an open project. Really all ya need to do is add a projector and some different software.
I will Google it and investigate, very curious. Thanks
You'll have an easier time scanning if you don't move the camera and just key out the background image in Lightroom or aftereffects. That way you just spin the object on the turntable
Unfortunately that's not how this software works best
The extruded geometry would be even more accurately
follow the scan if you used the sketch section functionality Fusion 360 offers.
Seriously the most under rated channel that I know of
Thanks man, I appreciate the comment feel free to share on social media
that's def not photogrammetry causing the error, it's 100% the scan process, reflections and lens aberrations not pre-calculated (and variance you have seen yourself in the video).
What's with the Amsterdam flag in the background? :-)
I like Amsterdam
@@EricStrebel It's a great city! We live there :-)
Rock on!
PANEL
It isn't if you don't know how to use both software packages correctly...
Amsterdam flag
Yup! 😄😄😄😄