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Pomiary przestrzenne w polu obserwacyjnym stereoendoskopu

Goral A.

Przegląd Elektrotechniczny

2015

R. 91, nr 5

13-16

W pracy przedstawiono procedurę trójwymiarowej metrycznej rekonstrukcji powierzchni na podstawie zapisu wideo ze stereoendoskopu stosowanego w chirurgii minimalnie inwazyjnej. Metoda bazuje na dopasowaniu obszarami fragmentów obrazów. Wyniki rekonstrukcji porównano z danymi uzyskanymi dla tego samego obiektu metodą referencyjną. Średni błąd rekonstrukcji uzyskany dla poszczególnych klatek sekwencji wynosi od 2,1 do 4,2 mm.

In this work, we present a procedure for 3-dimensional metric surface reconstruction based on video data from a stereoendoscope used in minimally invasive surgery. The reconstruction is based on stereo block matching algorithm. The results of the reconstruction were compared to a reference data set obtained simultaneously for the same object. The mean reconstruction error obtained for individual frames falls within the range of 2.1 to 4.2 mm.

Essential boundary conditions in meshfree methods via a modified variational principle: Applications to shell computations

Skatulla S., Sansour C.

Computer Assisted Mechanics and Engineering Sciences

2008

Vol. 15, No. 2

123-142

It has been recognized by many authors that the enforcement of the essential boundary conditions is not an easy task, when it comes to moving least square (MLS)-based meshfree methods. In particular, the modelling of non-linear problems requires high approximation accuracy in order to obtain a solution. This paper addresses the boundary approximation accuracy of MLS-based meshfree methods and shows more specifically its significance with respect to the imposition of essential boundary conditions by the penalty, the Lagrange multiplier method and their combination which results in a modified variational principle. The later is augmented by a stabilization term which uses individual stabilization parameters determined for each numerical integration point by an iteration procedure. This methodology is demonstrated on shell deformations in non-linear structural mechanics involving the Green strain tensor and two different hyper-elastic material laws.