  Event-based cameras are new type vision sensors whose pixels work
independently and respond asynchronously to brightness change with microsecond
resolution, instead of providing standard intensity frames. Compared with
traditional cameras, event-based cameras have low latency, no motion blur, and
high dynamic range (HDR), which provide possibilities for robots to deal with
some challenging scenes. We propose a visual-inertial odometry for stereo
event-based cameras based on Error-State Kalman Filter (ESKF). The visual
module updates the pose relies on the edge alignment of a semi-dense 3D map to
a 2D image, and the IMU module updates pose by median integral. We evaluate our
method on public datasets with general 6-DoF motion and compare the results
against ground truth. We show that our proposed pipeline provides improved
accuracy over the result of the state-of-the-art visual odometry for stereo
event-based cameras, while running in real-time on a standard CPU
(low-resolution cameras). To the best of our knowledge, this is the first
published visual-inertial odometry for stereo event-based cameras.
