16. The computer program product of claim 12 , wherein operating the discriminative tracker comprises: using an object model trained by an online support vector machine algorithm with local feature descriptors to focus on appearance variations of the object that occur within the sliding window.
16. The computer program product of claim 12 , wherein operating the discriminative tracker comprises: using an object model trained by an online support vector machine algorithm with local feature descriptors to focus on appearance variations of the object that occur within the sliding window. 17. The computer program product of claim 16 , wherein operating the discriminative tracker comprises: updating the online support vector machine algorithm based on samples of the video feed; and removing samples that fall outside of the sliding window from consideration by the online support vector machine algorithm.