Browsing by Author "Werman, Michael"

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    Clear Skies Ahead: Towards Real-Time Automatic Sky Replacement in Video
    (The Eurographics Association and John Wiley & Sons Ltd., 2019) Halperin, Tavi; Cain, Harel; Bibi, Ofir; Werman, Michael; Alliez, Pierre and Pellacini, Fabio
    Digital videos such as those captured by a smartphone often exhibit exposure inconsistencies, a poorly exposed sky, or simply suffer from an uninteresting or plain looking sky. Professionals may edit these videos using advanced and time-consuming tools unavailable to most users, to replace the sky with a more expressive or imaginative sky. In this work, we propose an algorithm for automatic replacement of the sky region in a video with a different sky, providing nonprofessional users with a simple yet efficient tool to seamlessly replace the sky. The method is fast, achieving close to real-time performance on mobile devices and the user's involvement can remain as limited as simply selecting the replacement sky.
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    Object Partitioning for Support-Free 3D-Printing
    (The Eurographics Association and John Wiley & Sons Ltd., 2019) Karasik, Eli; Fattal, Raanan; Werman, Michael; Alliez, Pierre and Pellacini, Fabio
    Fused deposition modeling based 3D-printing is becoming increasingly popular due to it's low-cost and simple operation and maintenance. While it produces rugged prints made from a wide range of materials, it suffers from an inherent printing limitation where it cannot produce overhanging surfaces of non-trivial size. This limitation can be handled by constructing temporary support-structures, however this solution involves additional material costs, longer print time, and often a fair amount of labor in removing it. In this paper we present a new method for partitioning general solid objects into a small number of parts that can be printed with no support. The partitioning is computed by applying a sequence of cutting-planes that split the object recursively. Unlike existing algorithms, the planes are not chosen at random, rather they are derived from shape analysis routines that identify and resolve various commonly-found geometric configurations. In addition, we guide this search by a revised set of conditions that both ensure the objects' printability as well as realistically model the printing capabilities of the printer at hand. Evaluation of the new method demonstrates its ability to efficiently obtain support-free partitionings typically containing fewer parts compared to existing methods that rely on support-structures.