Mr. Weiguo Zhang Profile

Weiguo Zhang

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Proceedings Article | 30 April 2024 Paper

The survey of one-stage anchor-free real-time object detection algorithms

Peng He, Weidong Chen, Lan Pang, Weiguo Zhang, Yitian Wang, Weidong Huang, Qi Han, Xiaofeng Xu, Yuan Qi

Proceedings Volume 13156, 1315602 (2024) https://doi.org/10.1117/12.3012931

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With the improvement of computer computing power, the object detection algorithms based on deep neural network has ushered in vigorous development, and has been widely used in industry, agriculture, medicine, military and other fields. One-stage object detection algorithms shows the superiority in real-time detection compared to other object detection algorithms such as two-stage object detectors or ViT-based detectors. At the same time, more and more anchor-free detectors show the advanced nature of anchor-free algorithms compared to anchor-based detectors. In this paper, we review the one-stage anchor-free real-time object detection algorithms in recent years, and analyze the application scenarios and optimization strategies of future object detection algorithms. Firstly, the principle and advantages of anchor-free object detection algorithms and one-stage object detection algorithm are introduced. Secondly, the network structure and innovation of anchor-free object detection algorithms in recent years are summarized. Finally, the possible development direction and trend of one-stage anchor-free real-time object detection algorithms in the future are proposed.

Proceedings Article | 4 April 2023 Paper

Bonding design and analysis of splitting prism assembly with RTV silicone rubber

Tan Wang, Weiguo Zhang, Yijie Yuan, Libing Hou, Wenbo Duan, Weidong Huang, Maqiang Wang

Proceedings Volume 12617, 126175I (2023) https://doi.org/10.1117/12.2666540

KEYWORDS: Prisms, Deformation, Mirrors, Design and modelling, Silicon, Adhesives

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Under thermal loading, low stress assembly is one of the key factors to ensure the pointing stability of the splitting prism assembly in a multiband optical mechanical system. By analyzing the common bonding methods of prism assembly, the factors affecting the bonding stability include the transverse stress of multi-point bonding, the internal stress of the adhesive and the longitudinal stress perpendicular to the bonding surface. Then, the optimization methods are proposed, e.g., reducing the span of bonding surface, increasing the free end area of bonding and adding longitudinal constraints. The simulation results show that the variety of all surfaces of the prism is restrained under the temperature load of - 45 ℃ to 60 ℃, the change of surface shape is reduced from 0.381µm to 0.148µm at 60 ℃ and from 0.982µm to 0.553µm at - 45 ℃, which improves the pointing stability of the splitting prism. It’s indicated that this bonding technology can effectively improve the pointing stability of splitting prism and can be applied to the engineering design of the precision optical system.

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