Fig. 1. Structural diagram of SSD network

Fig. 2. Carscale sequence with scale transformation

Fig. 3. Tracking sequence and correlation filtering response. (a) Tracking success sequence; (b) tracking failure sequence; (c) correlation filtering response of tracking success sequence; (d) correlation filtering response of tracking failure sequence

Fig. 4. (a) Concealed target; (b) correlation filtering response of concealed target

Fig. 5. (a) Sequence with small updating rate; (b) sequence with large updating rate; (c) response of sequence with small updating rate; (d) response of sequence with large updating rate

Fig. 6. Flow chart of proposed algorithm

Fig. 7. Variation of maximum response value and APCE index in occlusion or deformation scene. (a)(b) woman2 sequence and its response map; (c)(d) tiger2 sequence and its response map; (e)(f) Sylvester sequence and its response map

Fig. 8. Comparison between fixed updating rate and adaptive updating rate for tiger2 sequence. (a) Unoccluded image; (b)-(d) occluded image; (e) misidentified image; (f) lost tracking target characteristics

Fig. 9. (a) OP curves and (b) DP curves by different algorithms

Fig. 10. Comparison of partial tracking results by proposed algorithm and other ten algorithms. (a) singer2 sequence; (b) skating1 sequence; (c) soccer sequence