Fan Xiangsuo, Xu Zhiyong, Zhang Jianlin. Dim small target tracking based on improved particle filter[J]. Opto-Electronic Engineering, 2018, 45(8): 170569. doi: 10.12086/oee.2018.170569
Citation: Fan Xiangsuo, Xu Zhiyong, Zhang Jianlin. Dim small target tracking based on improved particle filter[J]. Opto-Electronic Engineering, 2018, 45(8): 170569. doi: 10.12086/oee.2018.170569

Dim small target tracking based on improved particle filter

    Fund Project: Supported by National Natural Science Foundation of China (61571096)
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  • As to solve the problem of dim small target tracking in low signal-to-noise ratio (SNR < 3 dB) scenes, an improved particle filter tracking method is proposed. This paper firstly obtains the gray feature by spatial position weighting method, and combines the neighborhood motion model and the gray probability graph to get the motion features of dim small target. Then construct the joint observation model of gray and motion features to calculate the particle weights. At the same time, in the process of tracking, the gray distribution of the target is not stable, and the strategy of adaptively updating the gray template of reference target is added. Finally, the sequence image is used to prove the tracking effect of dim small target. Experiments show that compared with the traditional particle filter algorithm, the proposed method greatly enhanced the tracking ability of dim small target in low SNR (SNR < 3 dB) scenes.
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  • Overview: At present, tracking algorithms of infrared weak and small targets mainly include single-frame detection algorithm, Meanshift algorithm, Kalman filtering, extended Kalman filter, and unscented Kalman filter. Single-frame detection algorithms achieve certain detection results in a specified scenario. However, the algorithms do not make the most of the motion information of the target in different frames, with certain limitations. Meanshift algorithm is easy to lead to tracking failure under the condition of the dynamic changing background or the occluded target. The Kalman filtering algorithm is only applicable to the linear Gaussian units. Extended Kalman filter can effectively solve the target tracking problem of nonlinear systems, but it is hard to solve the filter divergence problem. Untracked Kalman filter algorithm in order to solve the filter divergence problem, but the calculation error is relatively large with the method. Because the particle filter can greatly solve the problems in the nonlinear and non-Gaussian scenes, it has been developed as a significant research direction of weak and small target tracking algorithms. However, for similar background or strong noise interference, the traditional particle filter is prone to produce tracking loss in the following two conditions: 1) The target size is small. Relying only on the gray or shape characteristics is easy to lead to unstable. 2) In low SNR < 3 dB scenarios, it is prone to produce tracking loss due to high noise interference. In order to solve the problem of tracking loss that only relying on the single feature in low signal-to-noise ratio scene, some researchers have proposed a particle tracking filtering based on multi-feature fusion.

    As to solve the problem of dim small target tracking in low SNR scenes, an improved particle filter tracking method is proposed. This paper firstly obtains the gray feature by spatial position weighting method, and combines the neighborhood motion model and the gray probability graph to get the motion features of dim small target. Then construct the joint observation model of gray and motion features to calculate the particle weights. In the process of tracking, the gray distribution of the target is not stable, and the strategy of adaptively updating the gray template of reference target is added. Finally, the sequence image is used to prove the tracking effect of dim small target. Experiments show that compared with the traditional particle filter algorithm, the proposed method greatly enhanced the tracking ability of dim small target in low SNR scenes.

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