But then, why follow conventions. The quaternion derivative

In my¬†previous post I described the different qualities in a quaternion depending on choice of definition. The choice of direction: local-to-global or global-to-local, when you read an equation from right-to-left will not change the operations when you operate on a vector, it will just mean different things. But when you multiply two quaternions, like for … Continue reading But then, why follow conventions. The quaternion derivative

Quaternions, quaternions, quaternions… and the different definitions

Why would anybody want so many different definitions of quaternions around? And several of them are used extensively as well. And the normal situation is to not state which one you are using. There’s actually not that much information about the different definitions either. From Joan Sol√†’s article “Quaternion kinematics for the error-state KF” available … Continue reading Quaternions, quaternions, quaternions… and the different definitions

ORB-SLAM vs LSD-SLAM

Some hours ago I uploaded two videos of me running an image sequence through two of the state of the art visual monocular SLAM algorithms. Here are the links and the description: Part 1: LSD-SLAM Part 2: ORB-SLAM Having recorded a sequence at 20 fps in which there is quite much rotation per translation and … Continue reading ORB-SLAM vs LSD-SLAM