A Feature Detector tries to find a Point that is at best unique and can be found every time again. Also it can detect if the object/camera was rotated. (depending on the algorithm). They are nicely explained on Wikipedia. https://en.wikipedia.org/wiki/Feature_detection_(computer_vision)My Problem with Natural feature tracking is I don't find any definition.In this article they talk about Natural feature Tracking it seems really awesome. (http://handheldar.icg.tugraz.at/highspeed_nft.php).In google I mainly find things like landmarks but nothing computer Vision related. Can anyone Help me to understand what they mean with Natural Feature Tracking?Especially what is a Natural Feature in this case?Thanks :) 
What means Natural Feature Tracking?
computer vision