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Iterative spatial domain 2-D signal decomposition for effectual image up-scaling

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Abstract

Image up-scaling employs various polynomial interpolation schemes for their reduced computational complexity and suitability for various real-time applications. However, they give blurring artifacts in up-scaled images due to the loss of high frequency (HF) information. Likewise, most of the other edge directed and transform domain interpolation schemes available in the literature though produce lesser blurring as compared to polynomial interpolation schemes but are computationally more complex. To overcome these problems, an iterative spatial domain 2-D signal decomposition technique is proposed. It is meant for extracting the very high frequency (VHF) information from a low resolution (LR) image. The VHF information is obtained by performing the signal decomposition for an estimated number of iterations. Subsequently, the superimposition of this VHF extract with the low resolution image prior to image up-scaling reduces the blurring in its up-scaled counterpart. Since the degradation of higher order sub-band information such as HF and VHF is more than the low and medium frequency information during an up-scaling process, restoration of the most degraded VHF sub-band information would produce much lesser blurring. Simulation results reveal that the proposed scheme gives better performance than many of the existing schemes in terms of objective and subjective measures.

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Authors and Affiliations

  1. Department of Electronics and Communication Engg, Silicon Institute of Technology Bhubaneswar, Bhubaneswar, 751024, India

    Aditya Acharya

  2. Department of Electronics and Communication Engg, National Institute of Technology Rourkela, Rourkela, 769008, India

    Sukadev Meher

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  1. Aditya Acharya
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  2. Sukadev Meher
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Acharya, A., Meher, S. Iterative spatial domain 2-D signal decomposition for effectual image up-scaling. Multimed Tools Appl 80, 5577–5616 (2021). https://doi.org/10.1007/s11042-020-09947-7

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  • DOI: https://doi.org/10.1007/s11042-020-09947-7

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