Object tracking…

 

Image Credit : Google 

What is Object Tracking ?

Locating an object in successive frames of a video is called tracking .

ØObject tracking is the task of estimation of the object motion.

ØTrackers typically assume that the object is visible throughout the sequence.

ØHere we focus on the methods that represent the objects by geometric shapes and their motion is estimated between consecutive frames , i.e. these-called frame to-frame tracking.

ØTemplate tracking is the most straightforward approach in that case. The object is described by a target template (an image patch, a color histogram) and the motion is defined as a transformation that minimizes mismatch between the target template and the candidate patch.

Ø Templates have limited modeling capabilities as they represent only a single appearance of the object.

Ø To model more appearance variations, the generative models have been proposed.

ØThe generative models are either build offline or during run-time .

ØThe generative trackers model only the appearance of the object and as such often fail in cluttered background.

Ø In order to alleviate this problem, recent trackers also model the environment where the object moves.