Style-based Inverse Kinematics

Keith Grochow, Steven L. Martin, Aaron Hertzmann, Zoran Popović

We present an inverse kinematics system based on a learned model of human poses. Given a set of constraints, our system can produce the most likely pose satisfying those constraints, in realtime. Training the model on different input data leads to different styles of IK. The model is represented as a probability distribution over the space of all possible poses. This means that our IK system can generate any pose, but prefers poses that are most similar to the space of poses in the training data. We represent the probability with a novel model called a Scaled Gaussian Process Latent Variable Model. The parameters of the model are all learned automatically; no manual tuning is required for the learning component of the system. We additionally describe a novel procedure for interpolating between styles.

Our style-based IK can replace conventional IK, wherever it is used in computer animation and computer vision. We demonstrate our system in the context of a number of applications: interactive character posing, trajectory keyframing, real-time motion capture with missing markers, and posing from a 2D image.

Category:

Science & Technology

Tags:

• game
• development
• artifical
• intelligence
• animation

[TiagoTiagoT]

Is the 2d probability map how things are actually handled internally or just a simplification for the sake of demonstration or easiness of direct manipulation by a human or somthing?

And does it take time in consideration, i mean, does the pose in the previous N frames affect which pose the system thinks is the most probable for the current one?

[nhnifong]

Very clever research! Is the circular arrangement of data points at 2:45 due to the cyclic nature of walking? Are those 2D plots generated by a Kohonen self-organizing map?

[antiHUMANDesigns]

This is beyond me. I recently developed 2D skeletal animation with inverse kinematics, but it's so much easier in 2D. I'm a hobbyist, though.

[dani222606]

wow, thats alot of math! lol

[alexandrepv]

I am very interested in your research, do u have papers published on it?

[Yuyuyami]

Dude, CliffBurton, you're a dumbass.

[Cliffburton8]

awesome tutorial! can you tell me what program you used or send a pm on information about it. I've been looking for inverse kinematics in programs for a long because I don't photoshop has it.