Deng Pan, Yanli Li, Dong Gao, Jianhua Zheng. Center Extraction Method of Multiple and Overlapping Faculae Based on Ellipse Fitting[J]. Acta Optica Sinica, 2020, 40(14): 1410001
- Acta Optica Sinica
- Vol. 40, Issue 14, 1410001 (2020)
Fig. 1. Flow chart of multiple facula/overlapping facula center extraction algorithm
Fig. 2. Input image
Fig. 3. Binary graph after preprocessing
Fig. 4. Connected domain diagram
Fig. 5. Image after edge extraction
Fig. 6. Shape factor varying with oblateness and degree of overlap. (a) Shape factor varying with oblateness; (b) shape factor varying with degree of overlap
Fig. 7. Overlapping facula segmentation
Fig. 8. Spot center extraction results
Fig. 9. Real solar faculae. (a) Image of real solar faculae; (b) cross section of gray value distribution of single solar facula
Fig. 10. Local images obtained by some experiments. (a) Circle faculae obtained by experiment on degree of overlap; (b) ellipse faculae obtained by experiment on degree of overlap; (c) ellipse faculae obtained by experiment on overlapping angle
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Table 1. Average position errors
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Table 2. Average standard deviationpixel
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