Browsing by Author "Chaudhuri, Parag"

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    Local Scale Adaptation to Hand Shape Model for Accurate and Robust Hand Tracking
    (The Eurographics Association and John Wiley & Sons Ltd., 2022) Kalshetti, Pratik; Chaudhuri, Parag; Dominik L. Michels; Soeren Pirk
    The accuracy of hand tracking algorithms depends on how closely the geometry of the mesh model resembles the user's hand shape. Most existing methods rely on a learned shape space model; however, this fails to generalize to unseen hand shapes with significant deviations from the training set. We introduce local scale adaptation to augment this data-driven shape model and thus enable modeling hands of substantially different sizes. We also present a framework to calibrate our proposed hand shape model by registering it to depth data and achieve accurate and robust tracking. We demonstrate the capability of our proposed adaptive shape model over the most widely used existing hand model by registering it to subjects from different demographics. We also validate the accuracy and robustness of our tracking framework on challenging public hand datasets where we improve over state-of-the-art methods. Our adaptive hand shape model and tracking framework offer a significant boost towards generalizing the accuracy of hand tracking.
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    A Survey on Sketch Based Content Creation: from the Desktop to Virtual and Augmented Reality
    (The Eurographics Association and John Wiley & Sons Ltd., 2020) Bhattacharjee, Sukanya; Chaudhuri, Parag; Mantiuk, Rafal and Sundstedt, Veronica
    Sketching is one of the most natural ways for representing any object pictorially. It is however, challenging to convert sketches to 3D content that is suitable for various applications like movies, games and computer aided design. With the advent of more accessible Virtual Reality (VR) and Augmented Reality (AR) technologies, sketching can potentially become a more powerful yet easy-to-use modality for content creation. In this state-of-the-art report, we aim to present a comprehensive overview of techniques related to sketch based content creation, both on the desktop and in VR/AR. We discuss various basic concepts related to static and dynamic content creation using sketches. We provide a structured review of various aspects of content creation including model generation, coloring and texturing, and finally animation. We try to motivate the advantages that VR/AR based sketching techniques and systems can offer into making sketch based content creation a more accessible and powerful mode of expression. We also discuss and highlight various unsolved challenges that current sketch based techniques face with the goal of encouraging future research in the domain.