Since they are not synchronized, it will probably be equivalent to just connecting 2 standard webcams. (probably won't work) For ~$400 you can get 2 pt-grey firefly MV cameras, and synchronizing them shouldn't be that hard... you can either: 1) Use a PIC or other digital signal source to trigger both cameras using their external trigger capability or 2) connect the GPIO pin on one of the cameras to the external-trigger pin on BOTH. (this only requires a jumper "cable between" the two cameras) -=Abe On Mon, Nov 1, 2010 at 12:46 AM, Kurt Konolige wrote: > 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 < > konolige@willowgarage.com> > > 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 > _______________________________________________ > ros-users mailing list > ros-users@code.ros.org > https://code.ros.org/mailman/listinfo/ros-users >