Anh, I'm not sure if it will work, since I haven't tried it. Cheers --Kurt On Thu, Oct 28, 2010 at 1:03 PM, Anh Nguyen wrote: > Thanks again Kurt, > Do you know if this Minoru setup will work with vslam? I remember reading > somewhere on ROS wiki that the timestamp from the two camera should be > exactly the same, and it is said on the Minoru project website that those > two webcams are not synchronized. > Best, > -M.A > > > On Thu, Oct 28, 2010 at 2:07 PM, Kurt Konolige > wrote: >> >> M.A., I remember this link for a stereo webcam: >> >> http://code.google.com/p/sentience/wiki/MinoruWebcam >> >> Reasonable baselines for indoors are 6 - 10 cm; wide-angle lenses also >> help. >> >> Cheers --Kurt >> >> On 10/28/2010 11:21 AM, Anh Nguyen wrote: >>> >>> Hi Kurt, >>> >>> Thanks for the helpful answers. Look like cheap stereo vision is not an >>> easy option, especially with my limited hardware skill. >>> >>> Can you extrapolate a bit more on augmenting VSLAM with odometry or >>> IMUs. I have the odometry reading for my robot. How do I configure VSLAM >>> to work with one camera and combine odometry / IMU with VSLAM (what >>> would be a simple algorithm for that)? >>> >>>  From what I read, I also assume that IMU would work indoor, is that >>> correct? >>> >>> Also, if I go with stereo camera,is there any requirement regarding the >>> baseline, resolution, frame rate... for making it work with existing >>> VSLAM stack? >>> >>> Best, >>> >>> -M.A >>> >>> >>> On Thu, Oct 28, 2010 at 1:08 AM, Kurt Konolige >>> > wrote: >>> >>>    M.A. - >>> >>>    VSLAM currently works only with stereo cameras.  VSLAM with monocular >>>    cameras is much less robust, unless it is augmented with other sensors >>>    such as odometry or IMUs. >>> >>>    Using two webcams to make a stereo pair is difficult.  You have to: >>> >>>    1. Make sure they're rigidly mounted >>>    2. Synchronize them >>> >>>    Synchronization is difficult for standard webcams.  At the moment I >>>    don't think there are any cheap off-the-shelf stereo cams.  Here's one >>>    reference for a do-it-yourself: >>> >>>    http://sszymczy.rootnode.net/index.php?menu=projects >>> >>>    It would be nice to do some kind of VSLAM on the Create using odometry >>>    to help, but that would take some work. >>> >>>    Cheers --Kurt >>> >>>    On 10/27/2010 9:46 PM, Anh Nguyen wrote: >>>     > Hi everyone, >>>     > >>>     > I have a few questions about VSLAM. I am new to robotics and most >>>    of its >>>     > terminologies so I would appreciate any references that may >>>    explain the >>>     > background needed to understand your answer :) >>>     > >>>     > - Can I use ROS VLSAM stack using only one camera (a webcam on my >>>     > netbook to be more specific). >>>     > - If so how do I configure VSLAM to get this to work? >>>     > - If not, can I add another external webcam and use them as a >>> stereo >>>     > video system or do I have to purchase some commercial stereo >>>    camera? If >>>     > I have to purchase a commercial system, is there any  good one for >>> < >>>     > $400 range? >>>     > >>>     > Has anyone tried to get VSLAM to work with iRobot Create? I spent >>> the >>>     > last few weeks creating a reduced version of the PrairieDog stack >>>    that >>>     > work without the laser range finder and the stargazer, and mapped >>> my >>>     > office using the robot's bumper sensor, only to realize that I >>> cannot >>>     > rely solely on the robot's encoders for accurate localization. >>>     > >>>     > Thanks a lot, >>>     > >>>     > -M.A >>>     > >>>     > >>>     > >>>     > _______________________________________________ >>>     > ros-users mailing list >>>     > ros-users@code.ros.org >>>     > https://code.ros.org/mailman/listinfo/ros-users >>>    _______________________________________________ >>>    ros-users mailing list >>>    ros-users@code.ros.org >>>    https://code.ros.org/mailman/listinfo/ros-users >>> >>> >>> >>> >>> _______________________________________________ >>> ros-users mailing list >>> ros-users@code.ros.org >>> https://code.ros.org/mailman/listinfo/ros-users > > ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ ros-users mailing list ros-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ros-users