Anastasios wrote:
Wishgranter wrote:
Over next few days will show 2 dataset on turntable
How to shoot what to watch, and if it cannot be aligned in one piece how to get it together…
I am sorry to resurrect this old thread, but I am very interested on how to shoot and how to align top and bottom of an object on a turntable.
I’ll resurrect again. I’m new to photogrammetry but I’ve been playing around with the turntable aspect and thought I’d share something that’s worked really well for me. This is just experimenting and done very cheaply.
I created a box with an open front from plain white poster board. $.50 per sheet at my local store. Robbed a 10" turntable base from a spice rack in the kitchen. 4 cheap lamps with 60w led bulbs shining into the front of the box. Bulbs are just open as the white poster board seems to do a good job of diffusing light from the source. I place a featureless plain white glass dinner plate over the turntable near the center of the box and put the object in the center of the plate. What I’ve found is that with a camera on a tripod in front of the box, I can shoot a complete revolution of an object on the turntable, then rotate the object on any axis and shoot another revolution. Most of the time I get a 100% alignment and little to no cleanup after reconstruction.
Like I said I’m new at this but I guess the glass plate doesn’t register? Whatever the reason it works very well. Never have to move the camera, just rotate the object to get top and bottom. I usually only have to rotate the object once 90 degrees to get the top and bottom as well. Very few to no stray points and good reconstruction detail of all sides with good lighting and 100-150 photos.