NDLI: Data-driven curvature for real-time line drawing of dynamic scenes

Content Provider	ACM Digital Library
Author	Hertzmann, Aaron Mccrae, James Nowrouzezahrai, Derek Simari, Patricio Kalogerakis, Evangelos Singh, Karan
Copyright Year	2009
Abstract	This article presents a method for real-time line drawing of deforming objects. Object-space line drawing algorithms for many types of curves, including suggestive contours, highlights, ridges, and valleys, rely on surface curvature and curvature derivatives. Unfortunately, these curvatures and their derivatives cannot be computed in real-time for animated, deforming objects. In a preprocessing step, our method learns the mapping from a low-dimensional set of animation parameters (e.g., joint angles) to surface curvatures for a deforming 3D mesh. The learned model can then accurately and efficiently predict curvatures and their derivatives, enabling real-time object-space rendering of suggestive contours and other such curves. This represents an order-of-magnitude speedup over the fastest existing algorithm capable of estimating curvatures and their derivatives accurately enough for many different types of line drawings. The learned model can generalize to novel animation sequences and is also very compact, typically requiring a few megabytes of storage at runtime. We demonstrate our method for various types of animated objects, including skeleton-based characters, cloth simulation, and blend-shape facial animation, using a variety of nonphotorealistic rendering styles. An important component of our system is the use of dimensionality reduction for differential mesh data. We show that Independent Component Analysis (ICA) yields localized basis functions, and gives superior generalization performance to that of Principal Component Analysis (PCA).
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	07300301
e-ISSN	15577368
DOI	10.1145/1477926.1477937
Volume Number	28
Issue Number	1
Journal	ACM Transactions on Graphics (TOG)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-02-09
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Independent Component Analysis (ICA) Real-time curvature Data-driven curvature Neural network regression Real-time line drawing Real-time nonphotorealistic rendering for deforming objects
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design

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