Abstract: To address the issue that the complementary learner tracking algorithm (Staple) cannot perform well when the target suffers from severe occlusions,a high-confidence update complementary learner tracker (HCLT) was proposed.Firstly,at the input frame,a standard correlation filter is employed to calculate the correlation filter (CF) response.Secondly,the confidence value based on the CF response is calculated and the update of the correlation filter is stopped when the current confidence value exceeds the mean confidence value.Then,if the number of the continuous no-updated frames comes up to ten,the tracker will be forced to update the filter.Finally,the final response is obtained by combining the CF response with the color response,and the location of maximum response is the tracking result.Expe-riment results show that compared with several state-of-the-art trackers including complementary learner(Staple),end-to-end representation correlation filter net tracker(CFNet),attentional correlation filter network tracker(ACFN) and hedged deep tracking(HDT),the proposed algorithm is the best in terms of success rate,outperforming the baseline tracker Staple by 1.0 percentage points and 0.4 percentage points interms of success rate and expected average overlap(EAO)on OTB100 dataset and VOT2016 dataset,respectively.Besides,the performance on heavy occlusion and severe illumination variation sequences demonstrates the effectiveness of proposed tracker when handling drastic appearance variations.

Key words: Color histogram, Complementary learner tracking, Correlation filter, Occlusion detection, Visual tracking