Open mebasoglu opened 9 months ago
Just to make sure, are you talking about the point cloud crack at road level here:
Just to make sure, are you talking about the point cloud crack at road level here:
Hello, yes, I am talking about that.
Indeed, current implementation has not been designed to handle speed bumps.
Distortion corrector only takes into account linear speed (twist_it->twist.linear.x
) and yaw rate (imu_it->vector.z
). To handle speed bumps, it would be necessary to check pitch rate as well (imu_it->vector.y
).
I am not sure the math is much harder. However, while absolute linear and yaw acceleration stay usually low (i.e. speed and yaw rate are almost constant at scan level), pitch acceleration goes pretty high when the car hits a speed bump. So for the compensation to work properly, it would be necessary to have well synchronized sensors and high frequency IMU. If there is any delay in the measurement, you would end up with the wrong points being corrected, and the "corrected" result would be worse than the non-corrected one.
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Checklist
Description
While passing over a speed bump, the point cloud has a strange behaviour and distortion corrector cannot fix it. This causes ghost points and ground remover cannot delete them. (https://github.com/autowarefoundation/autoware.universe/issues/3673)
Here is a video of
VLS-128
driving on a speed bump:https://github.com/autowarefoundation/autoware.universe/assets/13589149/6533aa07-b2fc-41b8-badd-8b50eec7fe34
Expected behavior
Distortion corrector should compensate point cloud while driving over speed bump.
Actual behavior
Distortion corrector cannot fix point cloud on speed bump.
Steps to reproduce
Drive your vehicle on speed bump with a lidar such as
VLS-128
and you will see the behaviour.Versions
Possible causes
No response
Additional context
No response