Browsing by Author "Chen, Jiazhou"

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    Efficient Interpolation of Rough Line Drawings
    (The Eurographics Association and John Wiley & Sons Ltd., 2023) Chen, Jiazhou; Zhu, Xinding; Even, Melvin; Basset, Jean; Bénard, Pierre; Barla, Pascal; Chaine, Raphaëlle; Deng, Zhigang; Kim, Min H.
    In traditional 2D animation, sketches drawn at distant keyframes are used to design motion, yet it would be far too laborintensive to draw all the inbetween frames to fully visualize that motion. We propose a novel efficient interpolation algorithm that generates these intermediate frames in the artist's drawing style. Starting from a set of registered rough vector drawings, we first generate a large number of candidate strokes during a pre-process, and then, at each intermediate frame, we select the subset of those that appropriately conveys the underlying interpolated motion, interpolates the stroke distributions of the key drawings, and introduces a minimum amount of temporal artifacts. In addition, we propose quantitative error metrics to objectively evaluate different stroke selection strategies. We demonstrate the potential of our method on various animations and drawing styles, and show its superiority over competing raster- and vector-based methods.
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    Stroke Synthesis for Inbetweening of Rough Line Animations
    (The Eurographics Association, 2020) Chen, Jiazhou; Zhu, Xinding; Bénard, Pierre; Barla, Pascal; Lee, Sung-hee and Zollmann, Stefanie and Okabe, Makoto and Wuensche, Burkhard
    In this paper, we present a stroke synthesis approach for the inbetweening of rough line animations. In pre-process, keyframe strokes are transformed by local perturbation and sliding to generate a number of candidate strokes, and adjacent keyframes are registered together. During inbetweening, candidate strokes are transferred to the intermediate frames and selected based on the desired spatial distribution and length constraints.