The speckle image reconstruction of the solar small scale features

Libo Zhong; Yu Tian; Changhui Rao

doi:10.1117/12.2073104

24 November 2014 The speckle image reconstruction of the solar small scale features

Libo Zhong, Yu Tian, Changhui Rao

Proceedings Volume 9301, International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition; 93012X (2014) https://doi.org/10.1117/12.2073104
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

The resolution of the astronomical object observed by the earth-based telescope is limited due to the atmospheric turbulence. Speckle image reconstruction method provides access to detect small-scale solar features near the diffraction limit of the telescope. This paper describes the implementation of the reconstruction of images obtained by the 1-m new vacuum solar telescope at Full-Shine solar observatory. Speckle masking method is used to reconstruct the Fourier phases for its better dynamic range and resolution capabilities. Except of the phase reconstruction process, several problems encounter in the solar image reconstruction are discussed. The details of the implement including the flat-field, image segmentation, Fried parameter estimation and noise filter estimating are described particularly. It is demonstrated that the speckle image reconstruction is effective to restore the wide field of view images. The qualities of the restorations are evaluated by the contrast ratio. When the Fried parameter is 10cm, the contrast ratio of the sunspot and granulation can be improved from 0.3916 to 0.6845 and from 0.0248 to 0.0756 respectively.

Citation Download Citation

Libo Zhong, Yu Tian, and Changhui Rao "The speckle image reconstruction of the solar small scale features", Proc. SPIE 9301, International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition, 93012X (24 November 2014); https://doi.org/10.1117/12.2073104

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