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. Author manuscript; available in PMC: 2018 Apr 10.
Published in final edited form as: Int J Comput Assist Radiol Surg. 2017 Mar 25;12(6):901–910. doi: 10.1007/s11548-017-1564-y

Fig. 4.

Fig. 4

d–f Three sample images for evaluating the text readability. g–i Three sample images for evaluating the contrast perception. a Participant stands beside the simulated surgery site, testing the performance of OST-HMDs sequentially. An image is used as a tracking target. b Mixed reality capture of HoloLens: A 2D-display is anchored to the tracking target. The 2D-display visualizes sample images of contrast perception and text readability. c Experimental setup for offline evaluation of system lag. The slow-motion camera captures the motion of image target and the display on OST-HMDs