Dot-Projection Photogrammetry and Videogrammetry of Gossamer Space Structures

Global Static Testing and Model Validation of Stiffened Thin-Film Polyimide Panels

“…Although inflatable and/or rigidizable space structures have recently been extensively investigated [4][5][6], formed or stiffened membrane structures have received substantially less attention. Flint et al [7,8] examined doubly curved form-stiffened thin-film shells in which the membrane is manufactured such that, without adding mass, the final surface had permanent depth and curvature.…”

Simplifying photogrammetric analysis for assessment of large mammal mass: automated targeting and 3D model building

“…The fine-tuned accuracy and dramatically reduced processing time demonstrated through the use of coded targets by Hattori et al (2002) is one such example. More than one type of coded target exists, including concentric rings (Schneider and Sinnreich, 1992;van den Heuvel et al, 1992), squares (Shortis and Seager, 2014) and dot distributions (Ganci and Handley, 1998;Pappa et al, 2003). Coded targets of any form have, however, not been used in zoological applications under natural field conditions and their implementation requires initial testing.…”

A low‐cost 3D reconstruction system using a single‐shot projection of a pattern matrix

“…The topic of 3D reconstruction using different methods has made great advances in recent years and, as a consequence, several commercial systems for close range applications are currently available on the market, such as 3D Metrics; Minolta 3D1500 Camera; Capture3D, and many other (Simple3D, 1999). The methodology employed in each particular system depends on the requirements of the application; for example, precision, cost, size of the object, distance between sensor and object, and others (Pappa et al, 2003;Malian et al, 2005;Remondino and El-Hakim, 2006;Grenness et al, 2008). One methodology largely used in 3D reconstruction is triangulation with structured light.…”

“…A unit for acquisition was developed, as well as a methodology for calibration, recognition of the projected patterns and surface reconstruction (Gorpas et al, 2007). Pappa et al (2003) used projected dots of light as targets for photogrammetric reconstruction of gossamer space structures. These structures contain large areas of delicate, thin-film membranes like solar sails, large antennas, solar-power concentrators and transmitters, sun shields and planetary balloons.…”