A Computational Approach to Edge Detection
IEEE Transactions on Pattern Analysis and Machine Intelligence
Real-time nonphotorealistic rendering
Proceedings of the 24th annual conference on Computer graphics and interactive techniques
Interactive technical illustration
I3D '99 Proceedings of the 1999 symposium on Interactive 3D graphics
Evaluation of Methods for Ridge and Valley Detection
IEEE Transactions on Pattern Analysis and Machine Intelligence
Line direction matters: an argument for the use of principal directions in 3D line drawings
NPAR '00 Proceedings of the 1st international symposium on Non-photorealistic animation and rendering
Proceedings of the 27th annual conference on Computer graphics and interactive techniques
WYSIWYG NPR: drawing strokes directly on 3D models
Proceedings of the 29th annual conference on Computer graphics and interactive techniques
FG '98 Proceedings of the 3rd. International Conference on Face & Gesture Recognition
Enhancing Transparent Skin Surfaces with Ridge and Valley Lines
VIS '95 Proceedings of the 6th conference on Visualization '95
Suggestive contours for conveying shape
ACM SIGGRAPH 2003 Papers
Mesh scissoring with minima rule and part salience
Computer Aided Geometric Design - Special issue: Geometry processing
Abstraction of man-made shapes
ACM SIGGRAPH Asia 2009 papers
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This paper presents a new method of line drawing based on the hypothesis that artists draw the lines that decompose the object into parts, and the lines that help convey the shapes of the parts. But they draw these lines differently depending on the viewpoint. Contours are the most obvious part-decomposing lines. Valley lines, which typically delimit convex parts, are also part-decomposing lines. As shape-conveying lines, ridge lines on each part are chosen; they are good at conveying the shape of parts in that they are maxima of the principal curvatures on the part surface. So, valley and ridge lines are good candidates in line-drawing. But they have been dismissed because they are view-independent unlike contours. But because of their shape-conveying capability, they have a strong intuitive appeal as candidates for line-drawing. So we propose a way to ”redeem” them by making them view-dependent: Valley and ridge lines are given strengths depending on how the view direction relates to the surface normals to the lines. On the other hand, when valleys and ridges are extremely strong, for example, when they are sharp edge lines, they are drawn regardless of viewpoint. We have found that the view-dependent valley and ridge lines are quite stable with respect to viewpoint change.