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Package Summary

A package for managing and launching stereo cameras attached to the PR2 gripper.

Overview

This package provides various files needed to use a gripper stereo sensor on the PR2. Launch, urdf, mesh, and config files are provided. This package will run correctly in simulation, enabling anyone to experiment with use of this sensor strategy even without the custom hardware.

Video

Hardware

At Willow Garage, a gripper stereo camera exists using WGE100 cameras. This camera operates the same as the narrow_stereo cameras on the PR2.

It is also possible to make a gripper stereo pair out of Logitech C905 webcameras. The CAD and other helpful information will be posted here in the near future so that anyone with access to a machine shop can create this hardware.

Robot Description

The robot description file used to launch the robot must include frames and other information about the gripper stereo cameras. The pr2.urdf.xacro file in pr2_gripper_stereo/urdf shows how to include the necessary modifications.

Calibration

After doing a number of calibration tests it was found that full-robot calibration does not significantly alter the CAD-based frame position of the gripper cameras.

As a result it seems sufficient to copy the gripper stereo urdf information into the bottom of any existing robot's calibrated urdf.

A patch to pr2_calibration_launch is available for those who would like to investigate it further.


2011-11-19 12:30