| Optimum threshold selection method of centroid computation for Gaussian spot | |
| Li, Xuxu1,2; Li, Xinyang1; Wang, Caixia1; Li, Xuxu (lixuxu188@163.com) | |
| Volume | 9675 |
| Pages | 967517 |
| 2015 | |
| Language | 英语 |
| ISSN | 0277-786X |
| DOI | 10.1117/12.2199247 |
| Indexed By | SCI ; Ei |
| Subtype | 会议论文 |
| Abstract | Centroid computation of Gaussian spot is often conducted to get the exact position of a target or to measure wave-front slopes in the fields of target tracking and wave-front sensing. Center of Gravity (CoG) is the most traditional method of centroid computation, known as its low algorithmic complexity. However both electronic noise from the detector and photonic noise from the environment reduces its accuracy. In order to improve the accuracy, thresholding is unavoidable before centroid computation, and optimum threshold need to be selected. In this paper, the model of Gaussian spot is established to analyze the performance of optimum threshold under different Signal-to-Noise Ratio (SNR) conditions. Besides, two optimum threshold selection methods are introduced: TmCoG (using m % of the maximum intensity of spot as threshold), and TkCoG (usingμn+κσ n as the threshold), μnand σnare the mean value and deviation of back noise. Firstly, their impact on the detection error under various SNR conditions is simulated respectively to find the way to decide the value of k or m. Then, a comparison between them is made. According to the simulation result, TmCoG is superior over TkCoG for the accuracy of selected threshold, and detection error is also lower. © Copyright 2015 SPIE.; Centroid computation of Gaussian spot is often conducted to get the exact position of a target or to measure wave-front slopes in the fields of target tracking and wave-front sensing. Center of Gravity (CoG) is the most traditional method of centroid computation, known as its low algorithmic complexity. However both electronic noise from the detector and photonic noise from the environment reduces its accuracy. In order to improve the accuracy, thresholding is unavoidable before centroid computation, and optimum threshold need to be selected. In this paper, the model of Gaussian spot is established to analyze the performance of optimum threshold under different Signal-to-Noise Ratio (SNR) conditions. Besides, two optimum threshold selection methods are introduced: TmCoG (using m % of the maximum intensity of spot as threshold), and TkCoG (usingμn+κσ n as the threshold), μnand σnare the mean value and deviation of back noise. Firstly, their impact on the detection error under various SNR conditions is simulated respectively to find the way to decide the value of k or m. Then, a comparison between them is made. According to the simulation result, TmCoG is superior over TkCoG for the accuracy of selected threshold, and detection error is also lower. © Copyright 2015 SPIE. |
| Conference Name | Proceedings of SPIE - The International Society for Optical Engineering |
| Conference Date | 2015 |
| Citation statistics | |
| Document Type | 会议论文 |
| Identifier | http://ir.ioe.ac.cn/handle/181551/7834 |
| Collection | 自适应光学技术研究室（八室） |
| Corresponding Author | Li, Xuxu (lixuxu188@163.com) |
| Affiliation | 1. Key Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, China 2. University of Chinese Academy of Sciences, Beijing, China |
| Recommended Citation GB/T 7714 | Li, Xuxu,Li, Xinyang,Wang, Caixia,et al. Optimum threshold selection method of centroid computation for Gaussian spot[C],2015:967517. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| 2015-2162.pdf（433KB） | 会议论文 | 开放获取 | CC BY-NC-SA | Application Full Text | ||
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