Mr. Gao Yuan Profile

Gao Yuan

at Shanghai Aerospace Control Technology Institute

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Proceedings Article | 17 August 2023 Paper

Adaptive star extraction algorithm in high dynamic

Xuwei Zhang, Xiaomin Zhan, Shuodong Sun, Yuan Gao, Chang Han

Proceedings Volume 12757, 1275734 (2023) https://doi.org/10.1117/12.2690518

KEYWORDS: Stars, Angular velocity, Star sensors, Matrices, Image processing, Image sensors, Background noise, Signal to noise ratio, Stray light

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At high angular velocity, the signal-to-noise ratio(SNR) of star image may become very low due to star point tailing, which leads to the decline of the star extraction rate. To solve this problem, an adaptive star extraction algorithm is proposed in this paper. Firstly, the star image is divided into several blocks, and the adaptive global threshold method is used in each block to get the gray extremum of each block. Then, the weight matrix of the star under the current angular velocity is obtained adaptively by Kalman filter. For the selected extreme pixel, the background threshold of the pixel is obtained by using the maximum background estimation method according to the calculated weight matrix. Finally, region growth is carried out in the eight neighborhood of the current pixel until all the star pixels are extracted. The experimental results show that this algorithm can extract stars in images taken at high angular velocity, and the extraction rate is higher than that of the traditional scanning method, which proves the algorithm is effective and has good robustness.

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