Virtual video synthesis for personalized trainingVirtual video synthesis for personalized training Πλήρης Δημοσίευση σε Συνέδριο Conference Full Paper 2019-05-212018enOnline personal training allows users to work out from the comfort of their own homes using workout videos designed by fitness instructors. Users of such applications can use their device (PC, laptop, smart TV, etc.) camera and work out with others in a group setting, enabling plethora of intertwined benefits. In order to enhance training efficiency, it could be helpful for the trainee to superimpose his/her human silhouette, giving the opportunity to easily detect the differences of his/her exercise over the trainer's movements. One way to proceed towards this direction is to have a camera recording the video of the trainee during the exercise, which should be presented in contrast to the instructor's video on the device screen. In this work, we explore this direction and present traditional background estimation approaches in combination with foreground extraction techniques using videos recorded with static cameras. It is shown that none of the presented methods is able to efficiently face all possible challenges, like slow moving object (foreground) or presence of the moving object at the phase of background initialization, problems that mainly appear in in yoga exercise. As an alternative, we propose a series of techniques including an initial background reconstruction method followed by a selective updating scheme. In this way, the background image adaptively converges to the ground truth data enabled by the merging of information from detected moving regions (temporal processing) and color-based regions (spatial processing) of the video segment. Finally, we also apply the proposed method in space surveillance applications, using surveillance cameras, in order to evaluate the generality and efficiency of the proposed approach. http://creativecommons.org/licenses/by/4.0/IEEE International Conference on Imaging Systems and Techniques Markolefas Filippos Μαρκολεφας Φιλιππος Moirogiorgou Konstantia Μοιρογιωργου Κωνσταντια Giakos George C. Zervakis Michail Ζερβακης Μιχαηλ Institute of Electrical and Electronics Engineers Fusion of temporal and spatial information Image background reconstruction Motion tracking Silhouette extraction Video processing Image segmentation Object recognition