CompAesth 16: Workshop on Computational Aesthetics

Permanent URI for this collection

https://diglib.eg.org/handle/10.2312/15071

Browse

Browsing CompAesth 16: Workshop on Computational Aesthetics by Subject "I.3.3 [Computer Graphics]"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Painted Stained Glass
    (The Eurographics Association, 2016) Doyle, Lars; Mould, David; Angus Forbes and Lyn Bartram
    We propose a new region-based method for stained glass rendering of an input photograph. We achieve more regular region sizes than previous methods by using simple linear iterative clustering, or SLIC, to obtain tile boundaries. The SLIC regions respect image edges but provide an oversegmentation suitable for stained glass. We distinguish between important boundaries that match image edges, and unimportant boundaries that do not; we then resegment regions with unimportant boundaries to create more regular regions. We assign colors to stained glass tiles; lastly, we apply a painting layer to the simplified image, restoring fine details that cannot be conveyed by the tile shapes alone. This last step is analogous to the overpainting done in real-world stained glass. The outcome is a stylized image that offers a better representation of the original image content than has been available from earlier stained glass filters, while still conveying the sense of a stained glass image.
  • Thumbnail Image
    Item
    Stippling with Aerial Robots
    (The Eurographics Association, 2016) Galea, Brendan; Kia, Ehsan; Aird, Nicholas; Kry, Paul G.; Angus Forbes and Lyn Bartram
    We describe a method for creating stippled prints using a quadrotor flying robot. At a low level, we use motion capture to measure the position of the robot and the canvas, and a robust control algorithm to command the robot to fly to different stipple positions to make contact with the canvas using an ink soaked sponge. We describe a collection of important details and challenges that must be addressed for successful control in our implementation, including robot model estimation, Kalman filtering for state estimation, latency between motion capture and control, radio communication interference, and control parameter tuning. We use a centroidal Voronoi diagram to generate stipple drawings, and compute a greedy approximation of the traveling salesman problem to draw as many stipples per flight as possible, while accounting for desired stipple size and dynamically adjusting future stipples based on past errors. An exponential function models the natural decay of stipple sizes as ink is used in a flight. We evaluate our dynamic adjustment of stipple locations with synthetic experiments. Stipples per second and variance of stipple placement are presented to evaluate our physical prints and robot control performance.