I thought I’d write a quick post about my photogrammetry set-up for small objects, because I’ve been doing a lot recently, and as a result I’ve spent some time optimizing my workflow.
The long and the short of it is that it looks like this:
I’ve got a small light box from Amazon, which includes soft background and LED lighting. (Affiliate link: https://amzn.to/2wn4mra).
My Sony Nex-6 with 16-55mm lens, fully zoomed and manually focused, supported by a normal camera tripod.
Then I’ve got my Samsung note 8, upside down balanced using a flip case. Being upside down, I’m able to get the lens really close to the table (wine helps with photogrammetry):
This gives this kind of image:
Which, as you can see is nice and low, while the Nex-6 is taking photos from a higher level.
Now, the beauty of this setup: The Note 8 (and likely some other phone cameras) can be activated by voice! So I can press the shutter button on the Nex-6, and say ‘Cheese’ or ‘Snap’ and both cameras will take a photo. I then reach in, rotate the object by a small amount, and repeat.
I try and take about 40 pictures per revolution of the object, but having both cameras firing simultaneously means I can get 80 photos in two circles at different heights, in just a minute or two.
A successful reconstruction in AliceVision Meshroom looks like this:
You can see the two circles, the smaller lower one from the phone camera, and the larger higher circle from the DSLR, both providing full coverage.
Hopefully that’s of use for people who want to speed up data collection without resorting to expensive camera synchronization (or pushing lots of shutter buttons), relying on just a camera and a phone.