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Super-resolution with selective filter based on adaptive window and variable macro-block size

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Abstract

Super-resolution (SR) covers a set of techniques whose objective is to improve the spatial resolution of a video sequence or a single frame. In this scope, fusion SR techniques obtain high-resolution (HR) frames taking as a reference several low-resolution (LR) frames contained in a video sequence. This paper is based on a selective filter to decide the best LR frames to be used in the super-resolution process. Additionally, each frame division into macro-blocks (MBs) is analyzed both in a fixed block size approach, which decides which MBs should be used in the process, and in a variable block size approach with an adaptive MB size, which has been developed to set an appropriate frame division into MBs with variable size. These contributions not only improve the quality of video sequences, but also reduce the computational cost of a baseline SR algorithm, avoiding the incorporation of non-correlated data. Furthermore, this paper explains the way in which the enhanced algorithm proposed in it outperforms the quality of typical SR applications, such as underwater imagery, surveillance video, or remote sensing. The results are provided in a test environment to objectively compare the image quality enhancement obtained by bilinear interpolation, by the baseline SR algorithm, and by the proposed methods, thus presenting a quantitative comparison based on peak signal-to-noise ratio (PSNR) and Structural SIMilarity (SSIM) index parameters. The comparison has also been extended to other relevant proposals of the state of the art. The proposed algorithm significantly speeds up the previous ones, allowing real-time execution under certain conditions.

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Authors and Affiliations

  1. Oceanic Platform of the Canary Islands (PLOCAN), Telde, 35200, Las Palmas, Spain

    E. Quevedo

  2. Institute of Applied Microelectronics (IUMA), Universidad de Las Palmas de Gran Canaria, 35017, Las Palmas, Spain

    E. Quevedo, L. Sánchez, G. M. Callicó, F. Tobajas, J. de la Cruz, V. de Armas & R. Sarmiento

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  1. E. Quevedo
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  2. L. Sánchez
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  3. G. M. Callicó
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  4. F. Tobajas
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  5. J. de la Cruz
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  6. V. de Armas
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  7. R. Sarmiento
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Correspondence to E. Quevedo.

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Quevedo, E., Sánchez, L., M. Callicó, G. et al. Super-resolution with selective filter based on adaptive window and variable macro-block size. J Real-Time Image Proc 15, 389–406 (2018). https://doi.org/10.1007/s11554-015-0489-3

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  • DOI: https://doi.org/10.1007/s11554-015-0489-3

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