Lumo: illumination for cel animation
NPAR '02 Proceedings of the 2nd international symposium on Non-photorealistic animation and rendering
Image-guided maze construction
ACM SIGGRAPH 2007 papers
Semi-automatic stencil creation through error minimization
NPAR '08 Proceedings of the 6th international symposium on Non-photorealistic animation and rendering
NPAR '08 Proceedings of the 6th international symposium on Non-photorealistic animation and rendering
Stylized black and white images from photographs
NPAR '08 Proceedings of the 6th international symposium on Non-photorealistic animation and rendering
Proceedings of the International Symposium on Computational Aesthetics in Graphics, Visualization, and Imaging
Regularity and randomness in Bridget Riley's early Op art
Computational Aesthetics'08 Proceedings of the Fourth Eurographics conference on Computational Aesthetics in Graphics, Visualization and Imaging
Non-photorealistic rendering with spot colour
Proceedings of the Symposium on Computational Aesthetics
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A common technique in Op Art is the use of densely packed line segments to depict simple shapes such as circles and squares. Some artists have attempted to create more complex images using this technique but are faced with the difficulty of avoiding undesirable artifacts such as line breaks and T-junctions within their artworks. We introduce an algorithm that takes an arbitrary image and automatically generates the corresponding Op Art composition in this style. For 2-colour images, the algorithm produces artworks without any unwanted artifacts; for images with more colours, the basic algorithm cannot guarantee the removal of all artifacts, but we use a global optimisation technique to minimise their number. We also examine the use of curves in creating the illusion of 3D forms and present a corresponding algorithm based on a physical simulation of heat flow. The algorithms for generating Op Art with straight lines and with curves can be combined to create an interesting new style of art. The results have applications in graphic design, puzzle creation and non-photorealistic rendering.