[2] [2] COMANICIU D，RAMESH V，MEER P.Kernel-based object tracking[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence，2003，25(5):564-577.

[3] [3] Bradski G R.Computer Video Face Tracking for use in a Perceptual User Interface[EB/OL].

[4] [4] Fukanaga K，Hostetler L D.The estimation of the gradient of a density function，with applications in pattern recognition [J].IEEE Trans Information Theory，1975，21(1):32-40.

[5] [5] A Kokaram，R Morris，W Fitzgerald，et al. Interpolation of missing date in image sequences[J]. IEEE Trans.Image Processing，1995，4(11):1509-1519.