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Abstract

A constraint-based graphics system employs different examples of an image to define the constraints of the system. The examples are grouped into subsets which can be interpolated with one another, according to a user-specified input that determines the relative proportion of each example image. An animation can be created by defining a sequence of such interpolated images. Alternatively, a user can directly manipulate observable components of an image to define a particular state for the image. Automatic transformations are defined to provide registration of an image within an overall scene by shifting the frame of reference for an image so that unnatural movements do not occur as the animation proceeds through a sequence of states. The structure of the system permits an animation to be divided into distinct components that can be combined with complementary components of other animations, to provide new results. These components include a clip motion which defines a sequence of states, a clip character which applies the clip motion to a particular image configuration, and clip art.

Other References

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• Granieri, John P. et al, "Production and Playback of Human Figure Motion for Visural Simulation", ACM Transactions on Modeling and Computer Simulation, vol. 5, No. 3, Jul. 1995, pp. 222-241
• Librande, Steve, "Example-Based Character Drawing", pp. 1-69, 198