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Particle Filters A Collaborative Explanation By: Neeti Wagle & Mikael Pryor
Dynamic  system ,[object Object],[object Object],[object Object],x 1 x 2 x 3 y 1 y 2 y 3
Filtering ,[object Object]
Dynamic  system ,[object Object],[object Object],[object Object],x 1 x 2 x 3 y 1 y 2 y 3
Kalman Filtering Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Monte Carlo Approach ,[object Object],[object Object],[object Object],Miodrag Bolic, Lecture for the School of Information Technology and Engineering at the University of Ottawa, mbolic@site.uottawa.ca
Particle Filter Miodrag Bolic, Lecture for the School of Information Technology and Engineering at the University of Ottawa, mbolic@site.uottawa.ca ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Examples Sample space Posterior density Miodrag Bolic, Lecture for the School of Information Technology and Engineering at the University of Ottawa, mbolic@site.uottawa.ca Haris Baltzakis, November 2004, Kalman/Particle Filters Tutorial
Examples Source : Robotics and State Estimation Lab, University of Washington
Two Robots Play “Catch” By: Mikael Pryor [email_address]
Pong
Tracking The Ball ,[object Object],[object Object],[object Object],[object Object],[object Object]
Predicting Where The Ball Will Be ,[object Object],[object Object]
Predicting Where The Ball Will Be (Cont’d) ,[object Object]
Random Error ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Particle Filter ,[object Object]
The Final Product
Adding Excess Noise in X-Direction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The X-Noise Final Product
OBJECT LOCALIZATION USING A PHYSICS SIMULATOR Neeti Wagle University of Colorado at Boulder
INTRODUCTION ,[object Object],Consider object localization using particle filters
INTRODUCTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
INTRODUCTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
HYPOTHESIS ,[object Object],[object Object],[object Object],[object Object]
OPEN DYNAMICS ENGINE (ODE) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PHYSICS SIMULATOR PHYSICS  SIMULATOR OBJECT GEOMETRIES PARTICLE FILTERS
MOTIVATION - 1 ,[object Object],[object Object],This configuration is not valid in the real world!
MOTIVATION – 2 ,[object Object],[object Object],This configuration is not valid in the real world!
KEY IDEA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ALGORITHM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EXAMPLE 1
EXAMPLE 1
EXAMPLE 1
EXAMPLE 2
EXAMPLE 2
EXAMPLE 2
EXAMPLE 3
EXAMPLE 3
EXAMPLE 3
ADVANTAGES ,[object Object],[object Object],[object Object],[object Object]
SHORTCOMING ,[object Object],[object Object],[object Object]
IN THE PIPELINE ,[object Object],[object Object],[object Object]
FUTURE WORK ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SUMMARY ,[object Object],[object Object],[object Object]
QUESTIONS?

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Hinweis der Redaktion

  1. Goal : is to reason the way humans do But this is what the robot really sees This plot is showing the particle filters for a scene that the robot is sensing
  2. And by that I mean what if the objects could interact with the robot and be agents in their own right? Consider : This comm can either be passive or active. In passive…, In active the objects can actively make service request to the robot. A longterm motivating example is the dishwasher asking the robot to unload it. So these 2 factors really change the way we look at this problem. ….
  3. And by that I mean what if the objects could interact with the robot and be agents in their own right? Consider : This comm can either be passive or active. In passive…, In active the objects can actively make service request to the robot. A longterm motivating example is the dishwasher asking the robot to unload it. So these 2 factors really change the way we look at this problem. ….
  4. So the robot has the physics simulator which can serve as its conceptual knowledge of the world. It also has information about the geometries of the obj it senses. Finally, it continues to estimate the object locations using PFs. If you look at this model, we see that it is very similar to the way humans reason about their env and come to conclusions. But we are not quite sure how they use the conceptual knowledge to do that. So even with this powerful tool, the question still remains “what do we query the physics simulator about?”