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dc.contributor.authorAlasta, Amro F.*
dc.contributor.authorAlgamudi, Abdulrazag*
dc.contributor.authorQahwaji, Rami S.R.*
dc.contributor.authorIpson, Stanley S.*
dc.contributor.authorHauchecorne, A.*
dc.contributor.authorMeftah, M*
dc.date.accessioned2018-10-17T13:53:15Z
dc.date.available2018-10-17T13:53:15Z
dc.date.issued2018
dc.identifier.citationAlasta AF, Algamudi A, Qahwaji R, Ipson S, Hauchecorne A and Meftah M (2018) New method of Enhancement using Wavelet Transforms applied to SODISM Telescope. Advances in Space Research. 63(1): 606-616.en_US
dc.identifier.urihttp://hdl.handle.net/10454/16611
dc.descriptionyesen_US
dc.description.abstractPICARD is a space-based observatory hosting the Solar Diameter Imager and Surface Mapper (SODISM) telescope, which has continuously observed the Sun from July 2010 and up to March 2014. In order to study the fine structure of the solar surface, it is helpful to apply techniques that enhance the images so as to improve the visibility of solar features such as sunspots or faculae. The objective of this work is to develop an innovative technique to enhance the quality of the SODISM images in the five wavelengths monitored by the telescope at 215.0 nm, 393.37 nm, 535.7 nm, 607.1 nm and 782.2 nm. An enhancement technique using interpolation of the high-frequency sub-bands obtained by Discrete Wavelet Transforms (DWT) and the input image is applied to the SODISM images. The input images are decomposed by the DWT as well as Stationary Wavelet Transform (SWT) into four separate sub-bands in horizontal and vertical directions namely, low-low (LL), low-high (LH), high-low (HL) and high–high (HH) frequencies. The DWT high frequency sub-bands are interpolated by a factor 2. The estimated high frequency sub-bands (edges) are enhanced by introducing an intermediate stage using a stationary Wavelet Transform (SWT), and then all these sub-bands and input image are combined and interpolated with half of the interpolation factor α/2, used to interpolate the high-frequency sub-bands, in order to reach the required size for IDWT processing. Quantitative and visual results show the superiority of the proposed technique over a bicubic image resolution enhancement technique. In addition, filling factors for sunspots are calculated from SODISM images and results are presented in this work.en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://doi.org/10.1016/j.asr.2018.08.002en_US
dc.rights© 2018 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.en_US
dc.subjectSolar Diameter Imager and Surface Mapper (SODISM)en_US
dc.subjectLow-resolution imagesen_US
dc.subjectInterpolationen_US
dc.subjectDiscrete Wavelet Transforms (DWT)en_US
dc.subjectIDWTen_US
dc.subjectEnhanced imageen_US
dc.subjectFilling factoren_US
dc.subjectSolar imagesen_US
dc.titleNew method of Enhancement using Wavelet Transforms applied to SODISM Telescopeen_US
dc.status.refereedyesen_US
dc.date.Accepted2018-08-02
dc.date.application2018-08-12
dc.typeArticleen_US
dc.type.versionAccepted Manuscripten_US


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