IEEE Trans Image Process - Patchwise joint sparse tracking with occlusion detection.

Tópicos

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Resumo

This paper presents a robust tracking approach to handle challenges such as occlusion and appearance change. Here, the target is partitioned into a number of patches. Then, the appearance of each patch is modeled using a dictionary composed of corresponding target patches in previous frames. In each frame, the target is found among a set of candidates generated by a particle filter, via a likelihood measure that is shown to be proportional to the sum of patch-reconstruction errors of each candidate. Since the target's appearance often changes slowly in a video sequence, it is assumed that the target in the current frame and the best candidates of a small number of previous frames, belong to a common subspace. This is imposed using joint sparse representation to enforce the target and previous best candidates to have a common sparsity pattern. Moreover, an occlusion detection scheme is proposed that uses patch-reconstruction errors and a prior probability of occlusion, extracted from an adaptive Markov chain, to calculate the probability of occlusion per patch. In each frame, occluded patches are excluded when updating the dictionary. Extensive experimental results on several challenging sequences shows that the proposed method outperforms state-of-the-art trackers.

Resumo Limpo

paper present robust track approach handl challeng occlus appear chang target partit number patch appear patch model use dictionari compos correspond target patch previous frame frame target found among set candid generat particl filter via likelihood measur shown proport sum patchreconstruct error candid sinc target appear often chang slowli video sequenc assum target current frame best candid small number previous frame belong common subspac impos use joint spars represent enforc target previous best candid common sparsiti pattern moreov occlus detect scheme propos use patchreconstruct error prior probabl occlus extract adapt markov chain calcul probabl occlus per patch frame occlud patch exclud updat dictionari extens experiment result sever challeng sequenc show propos method outperform stateoftheart tracker

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