References

Clette, F., D. Berghmans, P. Vanlommel, R.A. Van der Linden, A. Koeckelenbergh and L. Wauters, 2007. From the Wolf number to the international sunspot index: 25 years of SIDC. Adv. Space Res., 40: 919-928.
CrossRef  |  Direct Link  |  

Comaniciu, D. and P. Meer, 2002. Mean shift: A robust approach toward feature space analysis. IEEE Trans. Patt. Anal. Machine Intel., 24: 603-619.
CrossRef  |  Direct Link  |  

Curto, J.J., M. Blanca and E. Martinez, 2008. Automatic sunspots detection on full-disk solar images using mathematical morphology. Solar Phys., 250: 411-429.
CrossRef  |  

Fuller, N. and J. Aboudarham, 2004. Automatic detection of solar filaments versus manual digitization. Proceedings of the 8th International Conference on Knowledge-Based Intelligent Information and Engineering Systems, September 20-25, 2004, Wellington, New Zealand, pp: 467-475.

Gray, L.J., J. Beer, M. Geller, J.D. Haigh and M. Lockwood et al., 2010. Solar influences on climate. Rev. Geophys., Vol. 48. 10.1029/2009RG000282

Hapgood, M., 2011. Lloyd's 360 Risk Insight: Space Weather: Its impacts on Earth and the Implications for Business. Lloyd's, London, UK.

Murugan, D., 2013. Hybrid edge detection using canny and ant colony optimization. Commun. Inform. Sci. Manage. Eng., 3: 402-405.

Pavlidis, T. and Y.T. Liow, 1990. Integrating region growing and edge detection. IEEE Trans. Pattern Anal. Mach. Intell., 12: 225-233.

Unnikrishnan, R., C. Pantofaru and M. Hebert, 2007. Toward objective evaluation of image segmentation algorithms. IEEE Trans. Patt. Anal. Mach. Intell., 29: 929-944.
CrossRef  |  

Walton, S.R., G.A. Chapman, A.M. Cookson, J.J. Dobias and D.G. Preminger, 1998. Processing photometric full-disk solar images. Solar Phys., 179: 31-42.
CrossRef  |  

Zharkov, S., V. Zharkova, S. Ipson and A. Benkhalil, 2005. Technique for automated recognition of sunspots on full-disk solar images. EURASIP J. Applied Signal Process., 2005: 2573-2584.
CrossRef  |  

Zharkov, S., V.V. Zharkova and S.S. Ipson, 2005. Statistical properties of sunspots in 1996-2004: I. Detection, North-South asymmetry and area distribution. Solar Phys., 228: 377-397.
CrossRef  |