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Design of real-time measurement for optical fiber positioning based on FPGA

In order to track the stellar objects in fiber spectroscopic telescopes, measuring the fiber positions is necessary, which is currently unsolved due to the large number of data. In this paper, we propose a novel measure method based on the Field Programmable Gate Arrays (FPGA). Firstly, the fiber spots are obtained from the complicated original images by preprocessing including the median filtering technique to remove the image noise and the correlation operation technique to enhance the fiber spot characteristic. Then, a novel fast connected component labeling technique is employed to acquire the accurate fiber positions. The design of the image processing system is realized by a five-stage pipeline technique based on the FPGA, thus the image processing speed is greatly improved and meanwhile the real-time calculation of the fiber positions is fulfilled.