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performance of VSLAM

Hello all,

Does anybody know why the VSLAM node in ROS doesn't perform too well when the robot is not moving exceptionally slow or while it takes a sharp turn?

I know there are some limitations to using images to determine position and generating a map.. but if someone could pinpoint the exact shortcomings to the algorithm used in the VLSAM package (or at least tell me what algorithm has been followed in this case), it would be reallly helpful!

I am new to SLAM and ROS.. this may be a very silly question, but it'd really help me learn!

Thanks! Divya