Browsing by Author "Singh, Karan"

Now showing 1 - 3 of 3
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    Levitating Rigid Objects with Hidden Rods and Wires
    (The Eurographics Association and John Wiley & Sons Ltd., 2021) Kushner, Sarah; Ulinski, Risa; Singh, Karan; Levin, David I. W.; Jacobson, Alec; Mitra, Niloy and Viola, Ivan
    We propose a novel algorithm to efficiently generate hidden structures to support arrangements of floating rigid objects. Our optimization finds a small set of rods and wires between objects and each other or a supporting surface (e.g., wall or ceiling) that hold all objects in force and torque equilibrium. Our objective function includes a sparsity inducing total volume term and a linear visibility term based on efficiently pre-computed Monte-Carlo integration, to encourage solutions that are as-hiddenas- possible. The resulting optimization is convex and the global optimum can be efficiently recovered via a linear program. Our representation allows for a user-controllable mixture of tension-, compression-, and shear-resistant rods or tension-only wires. We explore applications to theatre set design, museum exhibit curation, and other artistic endeavours.
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    Pacific Graphics 2021 - CGF 40-7: Frontmatter
    (The Eurographics Association and John Wiley & Sons Ltd., 2021) Zhang, Fang-Lue; Eisemann, Elmar; Singh, Karan; Zhang, Fang-Lue and Eisemann, Elmar and Singh, Karan
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    PosterChild: Blend-Aware Artistic Posterization
    (The Eurographics Association and John Wiley & Sons Ltd., 2021) Chao, Cheng-Kang; Singh, Karan; Gingold, Yotam; Bousseau, Adrien and McGuire, Morgan
    Posterization is an artistic effect which converts continuous images into regions of constant color with smooth boundaries, often with an artistically recolored palette. Artistic posterization is extremely time-consuming and tedious. We introduce a blend-aware algorithm for generating posterized images with palette-based control for artistic recoloring. Our algorithm automatically extracts a palette and then uses multi-label optimization to find blended-color regions in terms of that palette. We smooth boundaries away from image details with frequency-guided median filtering. We evaluate our algorithm with a comparative user study and showcase its ability to produce compelling posterizations of a variety of inputs. Our parameters provide artistic control and enable cohesive, real-time recoloring after posterization pre-processing.