RTI & Photogrammetry dome shaped device

[Mitek]

Hi all, 

Recently we have released to the public our Photogrammetry&RTI project that we have been working for over 2 years. We were inspired by some of your posts here with the dome approach and we decided that we should share with you our results.

Our aim was to create a cheap, affordable photogrammetric modeling as well as RTI imaging device, that anyone can create and does not cost thousands of euros. Because of that, we needed multiple cameras, led lights and a step motor, which allowed us to rotate an object placed on the rotating table and take photos around it. 

As our device heart we used RaspberryPi 4 and 4 ArduCAM cameras. We were aiming at small objects, artifacts which are not bigger than 100-120mm.

In the first iteration of our device we have used a small (32cm in diameter) dome (an aluminum bowl from IKEA….) with 40 led lights and 4 cameras. This version was successfully tested on Cyprus about 2 years ago where we gathered extremely valuable experience. 

In the second iteration we decided to leave the bowl approach and create a spider-like shape, with 10 arms for the led strips (12 leds on each) and 1 seperate arm for the cameras. It is much more mobile than the previous version as we can disassemble it and because of that it is easier to work with. Because in the first iteration we noticed that depth field was an issue, we decided to go with higher resolution cameras that have motorized focus, so we can use focus stacking method to increase our depth field. 

For the led strips we used flexible pcb which we connected together with FPC cables. We are controlling them through our shield that goes on the top of the raspberry pi 4. 

Below I am sending 2 links to my LinkedIn posts as I can not upload images here. 

https://www.linkedin.com/posts/marcin-k%C5%82%C4%99bowski-458bb5146_photogrammetry-rti-textured-activity-6766022368184860672-n2MF
https://www.linkedin.com/posts/marcin-k%C5%82%C4%99bowski-458bb5146_photogrammetry-rti-ptm-activity-6766744323838013440-z9yn

Thanks for inspiration guys and let us know what you think about our device. I am sure we will share some results as we will start testing and creating more RTI images for the objects. 
Marcin