A compact system to extract topography information from scenes viewed by a miniaturized submersible explorer
2012 (English)In: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 188, no SI, 401-410 p.Article in journal, Meeting abstract (Refereed) Published
In images taken underwater, it is generally difficult to correctly extract distances and geometric informationof objects. Different techniques, collectively referred to as photogrammetry, exist to measurefeatures in images. One of these is to project a reference pattern onto an object in a scene viewed by acamera, and register the distortion of this pattern, to calculate the shape of, and distance to, that object.This method is implemented here on a miniaturized submersible explorer equipped with, among manyother instruments, a camera. Diffractive optical elements (DOEs) have been designed and manufacturedusing microsystems technology, to, together with a laser diode, camera, and in-house developed software,provide a compact system for projecting reference patterns and analyzing their deformations. Thesystem has been characterized by measuring the distances and angles of objects in a water tank, andattempting to reproduce their shapes. The range of operation of the system, verified to be at least onemeter, is limited by the compact mounting in the small submersible and the cameras’ performance.The system was found to work well under turbid conditions as well as in water containing larger particles.Together with a vehicle-mounted camera, the compact and low-power DOE laser projection systemenables topographical measurement.
Place, publisher, year, edition, pages
2012. Vol. 188, no SI, 401-410 p.
Photogrammetry, Diffractive, Laser, Underwater, Images, Miniaturized
Engineering and Technology
Research subject Engineering Science with specialization in Microsystems Technology
IdentifiersURN: urn:nbn:se:uu:diva-171732DOI: 10.1016/j.sna.2012.02.034ISI: 000312692500054OAI: oai:DiVA.org:uu-171732DiVA: diva2:512217
The 16th International Conference on Solid-State Sensors, Actuators and Microsystems, 5-9 June, 2011, Beijing, CHINA
ProjectsDeeper Access, Deeper Understanding (DADU)