3D MODELS COMPARISON OF COMPLEX SHELL IN UNDERWATER AND DRY ENVIRONMENTS

摘要: Abstract. In marine biology the shape, morphology, texture and dimensions of shells organisms like sponges gorgonians are very important parameters. For example, a particular type gorgonian grows every year only few millimeters; this estimation was conducted without any measurement instrument but it has been provided after successive observational studies, because organism is fragile: contact could compromise its structure outliving. Non-contact system to be used preserve such organisms: photogrammetry method capable assure high accuracy contact. Nevertheless, achievement 3D photogrammetric model complex object (as or shells) challenge in normal environments, either with metric camera consumer camera. Indeed, successful automatic target-less image orientation matching algorithms strictly correlated properties calibration quality as well. underwater scenario, environment conditions strongly influence results quality; particular, water’s turbidity, presence suspension, flare other optical aberrations decrease reducing increasing noise on model. Furthermore, seawater density variability influences refraction index consequently interior reason, performed same survey conditions. paper, comparison between models Charonia Tritonis shell carried out through surveys both dry environments.