The squash-and-stretch stylization for character motions

Area of Science:

• Computer Graphics
• Animation
• Character Motion Synthesis

Background:

• The squash-and-stretch effect is a fundamental principle in traditional 2D cartoon animation.
• This technique enhances the perception of character rigidity and motion dynamics.

Purpose of the Study:

• To develop a computational method for applying the squash-and-stretch effect to character motion.
• To exaggerate character motion through spatial and temporal manipulation.

Main Methods:

• A novel method is proposed, combining spatial and temporal exaggeration techniques.
• Spatial exaggeration globally deforms poses using a covariance matrix of joint positions.
• Temporal exaggeration employs time-warping functions for individual joints to stretch limbs.

Main Results:

• The method generates motion sequences characterized by squashed and stretched poses with exaggerated limb stretching.
• User surveys indicate the stylized motion closely resembles traditional 2D cartoon animation.
• The generated motion is perceived as funnier by observers familiar with 2D animation.

Conclusions:

• The proposed method effectively synthesizes exaggerated character motion with a squash-and-stretch aesthetic.
• This technique offers a valuable tool for creating more dynamic and engaging character animations.
• The results validate the method's ability to mimic and enhance cartoon animation principles.