Studying the influence of markers arrangement on accuracy of the membrane shape mapping in the new DFD method
Wojciech Sulej · 2018
The Depth from Defocus (DFD) type method was developed for visual distance measurement. It was used to determine the shape of the flaccid membrane of the extracorporeal pneumatic heart assist pump. In the previous conference paper the technique of accuracy measurement of membrane shape mapping of an artificial ventricle was presented. The study was conducted on three membrane shapes which are well mathematically described: convex, concave and flat. For all cases the rigid membrane models were designed and 3D printed. The next study focused on extending the invented technique to other models of membrane with the well-known math formulas. Two new irregularly shaped models were produced and tested. Analysis of the obtained results during the rigid membrane models tests revealed the significant effect of the markers arrangement on the membrane shape mapping accuracy. Therefore, another arrangement of markers was tested. In the paper the comparison of the results obtained for the different arrangements of markers was presented.