Browne, I. D. PRECISION, ACCURACY, AND REPRODUCIBILITY OF RESEARCH-QUALITY PHOTOGRAMMETRIC MODELS OF VERTEBRATE MICROFOSSILS IN THE 0.5–2 MM SIZE RANGE Santella, M., Milner, A. R. PHOTOGRAMMETRY OF MICROFOSSIL VERTEBRATE TEETH FROM THE LOWER JURASSIC KAYENTA FORMATION OF SOUTHWESTERN UTAH
These were talks at the 2016 Society of Vertebrate Paleontology, but they should provide a good place to start. On Wednesday, December 14, 2016 at 10:29:02 AM UTC-7, Giada Giacomini wrote: > > Hi all, > > I am quite new to photogrammetry and geometric morphometric worlds and I > got a bit stocked. > I am trying to build 3D models of insectivorous bat skulls employing > photogrammetry (more details at the end) and Agisoft Photoscan software. > The methodology works quite well with bigger specimens (19 mm x 12 mm x 7 > mm). > But with a smaller ones (e.g. 13 x 8 x 5 mm) the software has different > problems in the 3D reconstruction: usually it is not able to reconstruct > the dense cloud (doing “inside out” or providing a long scratch of points) > or, if the first step had worked successfully, it isn’t able to align the 3 > chunks together. > > The pictures are in focus and the specimens in the picture results big > enough I would say. > We are trying with other software different from Agisoft but the > reconstruction is still difficult. > > Anyone of you have already tried to perform photogrammetry on such small > objects? > Do you have any suggestions or comments? > > Many thanks > > Giada > > Photogrammetry equipment and camera settings: > Camera: NIKON D5300 (24 megapixel) > Lens: NIKON macro 60 mm, f2.8 > Settings: > 4-5 cm from the specimen > 100 ISO > f/32 > 0.5 sec exposure time > No flash. 3 white lights > Focus: automatic focus on a manual selected square > -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org --- You received this message because you are subscribed to the Google Groups "MORPHMET" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
