Tutorial : Masking for Photogrammetry | CLICK 3D EP 12 | 3D Forensics CSI
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- เผยแพร่เมื่อ 13 มิ.ย. 2024
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Sometimes, when photographing for photogrammetry, your photos are not perfect; objects are present that you do not want to have in the final model, or there is a lot of empty foreground in some of the images. In these cases masking unwanted areas of the photos is an important part of the project.
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In this video, Eugene Liscio from ai2- 3D gives a tutorial on how to use masking to transform your photos into a realistic 3D models using the photogrammetry method.
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great example for those that don't have a lot of choice in their setup, but I find if you're lighting is setup right and you have a white or black backdrop, there's never a need to mask. I've never had to in my setup.
It's a Portuguese Trolley. It's Written GRAÇA, a lovely place in Lisbon!
That's where we got it!
great info! thank you for sharing!
Thank you, you are the best :)
I find that leaving a little background helps with Zephyr's Depth Mapping. Not with Turntables of course.
Спасибо, очень полезное видео!
That is from here, Portugal :)
Someone asked the question and now I can't find the comment so just in case....it is possible to use Masks in other formats like png with transparency or black and white masks. Masquerade can also export images that can be used in other programs. It's not as efficient as using the native .bin files but it will work.
Another fab video! Just noticed your in Canada! I’m Canadian (now living in Japan) what part of Canada are you in? Very good buddy used to teach forensic photography for rcmp back in Ottawa
Eugene, great video. I'd suggest that you go manual for your exposure meter the incident light falling on your subject not the reflected light your camera is meeting for your exposure values. That way you should find the exposure is the same for both backgrounds provided you haven't changed your lighting setup.
Edit to add: I like the white background the painted turntable provides. You'll find that it gives a bit of reflective boost to the darkened areas of the car interior through your windows.
Thanks Art, Do you mean to go with an external light meter? I have a good light meter that I bought some time ago and have been wanting to play with it, but sadly, it seems to keep falling to the bottom of the list.
@@3Dforensics Yes. The kind of external light meter with the white translucent sphere. You put the meter right next to your subject and measure the light falling onto the subject. Your camera is measuring the light reflected off the subject. You can also get a better measurement on this case if you use a spot meter mode on the camera to measure small individual areas of the train car, I.e., a white area, a silver area, a yellow area and anything darker, and not measure any of the background. Then average your readings and use that in manual mode for all your exposures. Provided none of the readings are like 20 stops different you will get acceptable images no matter the background color.
Hi Eugene. Great video, love the step-by-step as always. Would you have the link for that turntable that you use?
-Tony Gonzalez
You bet!
www.amazon.com/Aeroway-12-Inch-Rotating-Bearings-Turntable/dp/B0773LZ879/ref=sr_1_1?dchild=1&keywords=black+turntable+lazy+susan&qid=1613050525&sr=8-1
Thanks for the comments!
www.amazon.com/Organizer-Turntable-Cabinet-Computer-Plastic/dp/B0195KSR6Y/ref=sr_1_2_sspa?crid=1YUJQV8EFEHO9&keywords=turntable+lazy+susan&qid=1652471644&sprefix=turntable+lazy+susa%2Caps%2C200&sr=8-2-spons&psc=1&smid=A1IAGFXK3ICQ72&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFCTTROSFZaRzZFRlEmZW5jcnlwdGVkSWQ9QTAwNzg4MjkxSDlSTEFEWkZFUTg1JmVuY3J5cHRlZEFkSWQ9QTA4OTI4NjkxSTk0N1lKWktIOTdYJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
Is there any low-cost lighting solution from say IKEA? :) What about the missing background-features? I thought most photogrammetry applications need the moving background? What about Meshroom?
love these videos this program is like magic, now compared to like reality capture would you use this for certain things and reality capture for others, or basically both do the same thing?
Both do the same thing. Often times I will try the same project and run the photos through different programs. You can find that in some cases one program performs better than another while with a different set of images, the opposite is true. So experimentation is important.
What about inverting pics and deleting backgrounds? Can photogrametry still work ? since the other side of object is the same? You would still have the other side without going around it.
Some image editing is allowed but masking effectively removes the background for you. Why bother inverting the pictures. Build half the model and mirror it, much simpler.
I took a 1000 pictures today. I made 4 different messages and I have yet to get a wire frame out of it.
I looked at it in blender and it's not complete even though I took 4 levels of 360 degree pictures at f11 1/15 on a turntable
Hi, I just bought 3DF Zephyr.
How do you present your model on a webpage?
A simple way would be to use Sketchfab. Upload to their services and embed into your web page.
@@3Dforensics Thank you for the advice 📷
Congratulations, great professional videos, but I have a problem.
I looked carefully at the process, I used the same rotary table, but when I process the cloud with 3df Zephyr, the cameras don't rotate around the cloud and you only see one side or 180 degrees at most.
Why, what am I wrong?
Thank you so much
Roberto
I would need to see the photos!
@@3Dforensics Thanks for the reply. So the problem is not a Zephyr setting, but the quality of the photos.
I have followed your video "5 Common Mistakes when Photographing for Photogrammetry" carefully and will try to apply your advice on my camera, Sony alpha 6000. I hope to be successful.
I'll let you know
Thank you
When I try this I find that Zephyr thinks that the model is noise and the background is stationary. I try to crop as close to the model as possible and have been taking care to make the background as black as possible including moving it very far away from the model so it's an out-of-focus black blob.
I would have to see your photos in order to comment but often there is a good reason why this is happening.
@@3Dforensics until I saw your video I thought it was normal. Every other tutorial focused on completely eliminating the background so the software thinks you are actually circling the object.
Can we use green screen as background so it gets removed easily
Yes, for sure!
@@3Dforensics thanks
I really want to see the texture without STL. stock.
What software is this?
3DF Zephyr
Any tips for photogrammetry on fabrics? I am able use the techniques you teach for fabrics but a velvet is super hard to get the sheen.
I think I would need to see the setup as anything with small fibres can be tricky depending on the level of accuracy you are looking for. Are you looking to make models of the overall garments?
cant turne the object why???????????????????????????????????????????
Semangat mantap mampir 👍
Would have been nice if you have written your photogrammetry software in the title or at least say it in the intro. was watching for 20 minutes or so before I realized you use 3dzephyr, which is really not relevant to me and many others. Great video nonetheless but yeah.
or you know, skip the whole masking process by just doing a proper scan which doest not take any more time or effort compared to this shoddy turntable scan...