NPAR '02 Proceedings of the 2nd international symposium on Non-photorealistic animation and rendering
Isophotes: The Key to Tractable Local Shading Analysis
CAIP '95 Proceedings of the 6th International Conference on Computer Analysis of Images and Patterns
Human facial illustrations: Creation and psychophysical evaluation
ACM Transactions on Graphics (TOG)
Example-based composite sketching of human portraits
Proceedings of the 3rd international symposium on Non-photorealistic animation and rendering
Non-photorealistic rendering in context: an observational study
Proceedings of the 4th international symposium on Non-photorealistic animation and rendering
Recursive Wang tiles for real-time blue noise
ACM SIGGRAPH 2006 Papers
ACM SIGGRAPH 2006 Papers
NPAR by Example: Line Drawing Facial Animation from Photographs
CGIV '06 Proceedings of the International Conference on Computer Graphics, Imaging and Visualisation
Proceedings of the 5th international symposium on Non-photorealistic animation and rendering
Isophote distance: a shading approach to artistic stroke thickness
Proceedings of the 5th 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
Measuring Stipple Aesthetics in Hand-Drawn and Computer-Generated Images
IEEE Computer Graphics and Applications
How well do line drawings depict shape?
ACM SIGGRAPH 2009 papers
Capacity-constrained point distributions: a variant of Lloyd's method
ACM SIGGRAPH 2009 papers
Proceedings of the 7th International Symposium on Non-Photorealistic Animation and Rendering
ACM SIGGRAPH 2009 Courses
Stipple placement using distance in a weighted graph
Computational Aesthetics'07 Proceedings of the Third Eurographics conference on Computational Aesthetics in Graphics, Visualization and Imaging
Learning hatching for pen-and-ink illustration of surfaces
ACM Transactions on Graphics (TOG)
Real-time rendering of water surfaces with cartography-oriented design
Proceedings of the Symposium on Computational Aesthetics
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In this work, we present an automated system for creating hedcut illustrations, portraits rendered using small image feature aligned dots (stipples). We utilize edge detection and shading cues from the input photograph to direct stipple placement within the image. Both image edges and isophotes are extracted as a means of describing the image feature and shading information. Edge features and isophotes are then assigned different priorities, with isophotes being assigned the highest priority to enhance the depth perception within the hedcut portrait. Priority assignment dictates the stipple alignment and spacing. Finally, stipple size is based on the number of points and intensity and the gradient magnitude of the input image.