I am trying to create a production of a small object (close range photogrammetry) using cc. The object is ~ 12 cm x 4 cm , tall and narrow. I have taken images around the object (indoors no geo-referencing) with my camera rotated 90 degrees (portrait format) and pointing horizontally (parallel to the xy plane) to the object The resulting AT is extremely poor as shown
I took oblique images around the object, again in portrait format and the AT was better but still not acceptable as shown:
My camera was set to auto-rotate images and there was a warning that “photos have portrait rotation” I turned the auto-rotate function off and re took the images (as suggested by Bentley support), Images were landscape format with no warning but the AT was worse than before .
I would like to create models of statues/monuments that are tall but not wide so portrait images would be the best format. Has anyone come across this problem; any suggestion/help is much appreciated.
You need to set that image are took in sequence(at aerotriangulation) and that model is thin structure in block settings. Also try point density: high. Object looks good with lot of features so should work. Another trick would be to do camera pre-calibration on some other simple object(box) and re-use it on this object.
From screenshots it seems there are some very close to identical photos which cause this "singularity" issue with points in stray lines. Delete the identical photos to avoid that. Best is to use turn-table with marked degrees so object is well centered and rotation is in fixed steps.
Further to Oto's comments .. shoot the object on a textured surface to give the AT algorithm more data. Shooting on a glass table doesn't give it any tie points.
The acquisition guide suggests newspaper for example .. but something with lots of irregular (but not repeating) patterns.
Hi James/Oto
Thanks for the response and suggestions. I tried removing extra images, sequence/loop mode, thin structure and high density, but results were no better. In fact, with high density no photos were oriented. I’ll try camera calibration and a different surface, but I don’t think this will help. I did a different model using landscape mode on a white background and the results were good. See below.
I think that it has something to do with the fact that the images are rotated, in portrait mode I'll keep you posted
Farouk
Farouk Rohoman