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Dark satellite image enhancement using knee transfer function and gamma correction based on DWT–SVD

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Abstract

In this paper, an improved and simple approach for enhancement of dark and low contrast satellite image based on knee function and gamma correction using discrete wavelet transform with singular value decomposition (DWT–SVD) has been proposed for quality enhancement of feature. In addition, this method can also process the high resolution dark or very low contrast images, and offers best enhanced result using tuning parameter of Gamma. The technique decomposes the input image into four frequency subbands by using DWT and estimates the singular value matrix of the low–low subband image, and then compute the knee transfer function using gamma correction for further improvement of the LL component. Afterward, processed LL band image undergoes IDWT together with the unprocessed LH, HL, and HH subbands to generate an appropriate enhanced image. Although, various histogram equalization approaches has been proposed in the literature, they tend to degrade the overall image quality by exhibiting saturation artifacts in both low- and high-intensity regions. The proposed algorithm overcomes this problem using knee function and gamma correction. The experimental results show that the proposed algorithm enhances the overall contrast and visibility of local details better than the existing techniques.

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Acknowledgments

The author would like to thank to the referees who have contributed to enhancement of the technical contents of this paper. In addition, the authors would like to thank NASA’s earth observatory for providing the satellite images for research purposes.

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Authors and Affiliations

  1. PDPM Indian Institute of Information Technology Design and Manufacturing, Jabalpur, 482005, MP, India

    A. K. Bhandari, Anil Kumar & Vivek Soni

  2. Department of Electrical Engineering, Indian Institute of Technology Roorkee, Uttarakhand, 247667, India

    G. K. Singh

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  1. A. K. Bhandari
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  2. Anil Kumar
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  3. G. K. Singh
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  4. Vivek Soni
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Correspondence to A. K. Bhandari.

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Bhandari, A.K., Kumar, A., Singh, G.K. et al. Dark satellite image enhancement using knee transfer function and gamma correction based on DWT–SVD. Multidim Syst Sign Process 27, 453–476 (2016). https://doi.org/10.1007/s11045-014-0310-7

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  • DOI: https://doi.org/10.1007/s11045-014-0310-7

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