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- 저자 : Chunming Wen (검색결과 2 건)
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Data density-based RGB color component feature extraction and area measurement method for silkworm
Luo Yunyun,Wen Chunming,Wen Jie,Xu Qing,Liang Xiang,Yang Jie,Lan Zimian 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4
Accurate measurement of silkworm area is an essential part of efficient automated farming. The manual mea surement of silkworm area in large silkworm mounts has problems such as low accuracy and low efficiency. To address the problem that it is difficult to measure the area of silkworms in the silkworm holders accurately, this paper proposed a method to remove the background of color images based on RGB color components. In this method, the color component features of the silkworm rearing bed image were extracted. The K-means method was improved by the offset of component data peak density and the recalculation of the clustering center. Then, using the new clustering center to calculate the segmentation threshold point. After removing the background area, estimated the proportion of silkworm area in the silkworm rearing bed. In this paper, the area measurement experiments were carried out in different luminance environments for sparse and dense silkworm rearing bed images. After processing, the results of the proposed method were compared and analyzed with those of other segmentation methods. The results showed that the proposed intelligent segmentation threshold judgment method based on the RGB components difference feature has the lowest error rate, and the average accuracy of measurement is 87.29%. The method in this paper could effectively reduce the interference of ambient light on silkworm and mulberry leaves segmentation recognition, which might help improve the accuracy of measuring silkworm area.
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Inverse decoupling sliding mode control for multilevel buck converters in low‑power applications
Jiarong Wu,Liping Luo,Chunming Wen,Qingyu Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.8
Multilevel buck converters are gradually gaining attention in low-power applications. To realize the decoupling of the flying capacitor voltage and the output voltage, this paper proposes an inverse decoupling sliding mode control approach. A nonlinear mathematical model of the multilevel buck converters is built. The reversibility of the model is analyzed based on the inverse system theory, and linearization and decoupling are achieved. In addition, multiple pseudo-linear subsystems are obtained. Then sliding mode controllers are designed to control the linear subsystems. Furthermore, the global asymptotic stability of the control system is verified using the Lyapunov theory, and the robustness of the closed-loop system is demonstrated. Simulation and experimental results show that the proposed approach provides a better dynamic response when compared with existing methods.
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