Zhaoyang Yin, Dezhi Zhang, Linjie Zhao, Mingjun Chen, Jian Cheng, Xiaodong Jiang, Xinxiang Miao, Longfei Niu. A Dark-Field Detection Algorithm to Detect Surface Contamination in Large-Aperture Reflectors[J]. Acta Optica Sinica, 2020, 40(7): 0711003
- Acta Optica Sinica
- Vol. 40, Issue 7, 0711003 (2020)
Fig. 1. Dark field detection schematic diagram
Fig. 2. Auto-focus process
Fig. 3. Sharpness evaluation function curve
Fig. 4. Calibration board
Fig. 5. Linear distorted projection model
Fig. 6. Linear distortion correction model
Fig. 7. Comparison before and after top hat transformation. (a) Grayscale map of original image; (b) grayscale map of transformation results
Fig. 8. Autofocus curve. (a) Tenengrad function curve of coarse adjustment; (b) focusing motor position curve of accurate adjustment; (c) sub-window Tenengrad function curve of accurate adjustment
Fig. 9. Image contrast before and after autofocusing. (a) Image before autofocusing; (b) image after autofocusing
Fig. 10. Binarization algorithm comparison. (a) Original image; (b) Otsu algorithm; (c) maximum entropy model; (d) mean weighted adaptive binarization algorithm; (e) Laplacian weighted adaptive binarization algorithm
Fig. 11. Results of ultra-depth microscope. (a) Microscopic image of area 1; (b) microscopic image of area 2
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Table 1. Sharpness evaluation function performance indicators
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Table 2. Performance comparison of pollutant extraction algorithms
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