Visual-inertial odometry (VIO)
Formal
If an inertial measurement unit (IMU) is used within the VO system, it is commonly referred to as Visual Inertial Odometry (VIO). VIO pairs a camera and inertia sensors in a device to estimate its position and orientation.
Practical
Visual Odometry means estimating the 3D pose (translation + orientation) of a moving camera relative to its starting position, using visual features. It typically involves tracking a bunch of interest points across images in a video and then using 3D projective geometry to estimate the relative poses.
