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Real-time tracking of deformable objects based on MOK algorithm
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作者 Junhua Yan Zhigang Wang Shunfei Wang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2016年第2期477-483,共7页
The traditional oriented FAST and rotated BRIEF(ORB) algorithm has problems of instability and repetition of keypoints and it does not possess scale invariance. In order to deal with these drawbacks, a modified ORB... The traditional oriented FAST and rotated BRIEF(ORB) algorithm has problems of instability and repetition of keypoints and it does not possess scale invariance. In order to deal with these drawbacks, a modified ORB(MORB) algorithm is proposed. In order to improve the precision of matching and tracking, this paper puts forward an MOK algorithm that fuses MORB and Kanade-Lucas-Tomasi(KLT). By using Kalman, the object's state in the next frame is predicted in order to reduce the size of search window and improve the real-time performance of object tracking. The experimental results show that the MOK algorithm can accurately track objects with deformation or with background clutters, exhibiting higher robustness and accuracy on diverse datasets. Also, the MOK algorithm has a good real-time performance with the average frame rate reaching 90.8 fps. 展开更多
关键词 Kalman prediction oriented FAST and rotated BRIEF(ORB) match deformation real-time tracking
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A novel videogrammetry-based full-field dynamic deformation monitoring method for variable-sweep wings
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作者 Liqiang Gao Yan Liu +5 位作者 Bin Jiang Zhendong Ge Haoyang Li Xiang Guo Tao Suo Qifeng Yu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2024年第8期120-132,共13页
The measurement of wing dynamic deformation in morphing aircraft is crucial for achieving closed-loop control and evaluating structural safety.For variable-sweep wings with active large deformation,this paper proposes... The measurement of wing dynamic deformation in morphing aircraft is crucial for achieving closed-loop control and evaluating structural safety.For variable-sweep wings with active large deformation,this paper proposes a novel videogrammetric method for full-field dynamic deformation measurement.A stereo matching method based on epipolar geometry constraint and topological constraint is presented to find the corresponding targets between stereo images.In addition,a new method based on affine transformation combined with adjacent closest point matching is developed,aiming to achieve fast and automatic tracking of targets in time-series images with large deformation.A calculation model for dynamic deformation parameters is established to obtain the displacement,sweep variable angle,and span variation.To verify the proposed method,a dynamic deformation measurement experiment is conducted on a variable-sweep wing model.The results indicate that the actual accuracy of the proposed method is approximately 0.02%of the measured area(e.g.,0.32 mm in a 1.6 m scale).During one morphing course,the sweep variable angle,the span variation and the displacement increase gradually,and then decrease.The maximum sweep variable angle is 36.6°,and the span variation is up to 101.13 mm.The overall configuration of the wing surface is effectively reconstructed under different morphing states. 展开更多
关键词 Morphing aircraft Variable-sweep wing Videogrammetry Large dynamic deformation Target matching and tracking
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Track matching study from TPC to PHOS in ALICE
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作者 万仁卓 徐春成 +1 位作者 周代翠 殷中宝 《Chinese Physics C》 SCIE CAS CSCD 北大核心 2008年第8期620-623,共4页
We present a study for matching charged tracks reconstructed from the ALICE tracking detectors with the clusters measured in the photon spectrometer. Matching efficiency and contaminations due to wrong matches have be... We present a study for matching charged tracks reconstructed from the ALICE tracking detectors with the clusters measured in the photon spectrometer. Matching efficiency and contaminations due to wrong matches have been deduced for charged pions and muons. For electrons, the effect of the material in front of PHOS is discussed. 展开更多
关键词 ALICE experimental simulation photon detection track reconstruction track matching efficiency
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Track segment finding with CGEM-IT and matching to outer drift chamber tracks in the BESIII detector
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作者 孙新华 王亮亮 +10 位作者 伍灵慧 鞠旭东 修青磊 董燎原 董明义 李卫东 李卫国 刘怀民 欧阳群 袁野 张瑶 《Chinese Physics C》 SCIE CAS CSCD 2016年第9期125-132,共8页
The relative differences in coordinates of Cylindrical Gas Electron Multiplier Detector-based Inner Tracker(CGEM-IT) clusters are studied to search for track segments in CGEM-IT for the BESIII experiment.With the fu... The relative differences in coordinates of Cylindrical Gas Electron Multiplier Detector-based Inner Tracker(CGEM-IT) clusters are studied to search for track segments in CGEM-IT for the BESIII experiment.With the full simulation of single muon track samples, clear patterns are found and parameterized for the correct cluster combinations. The cluster combinations satisfying the patterns are selected as track segment candidates in CGEM-IT with an efficiency higher than 99%. The parameters of the track segments are obtained by a helix fitting.Some χ^2 quantities, evaluating the differences in track parameters between the track segments in CGEM-IT and the tracks found in the outer drift chamber, are calculated and used to match them. Proper χ^2 requirements are determined as a function of transverse momentum and the matching efficiency is found to be reasonable. 展开更多
关键词 CGEM-IT track segment finding track matching
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