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    Dou Nuo, Zhao Ruizhen, Cen Yigang, Hu Shaohai, Zhang Yongdong. Noisy Image Super-Resolution Reconstruction Based on Sparse Representation[J]. Journal of Computer Research and Development, 2015, 52(4): 943-951. DOI: 10.7544/issn1000-1239.2015.20140047
    Citation: Dou Nuo, Zhao Ruizhen, Cen Yigang, Hu Shaohai, Zhang Yongdong. Noisy Image Super-Resolution Reconstruction Based on Sparse Representation[J]. Journal of Computer Research and Development, 2015, 52(4): 943-951. DOI: 10.7544/issn1000-1239.2015.20140047

    Noisy Image Super-Resolution Reconstruction Based on Sparse Representation

    • Denoising and super-resolution reconstruction are performed separately in traditional methods for noisy image super-resolution reconstruction, while in the noisy image super-resolution reconstruction method based on sparse representation and dictionary learning the two processes are compounded together. Since an image patch can be well represented as a sparse linear combination of elements from an appropriately chosen over-complete dictionary, two dictionaries are trained respectively from noisy low- and clean high- resolution image patches by enforcing the similarity of two sparse representations with respect to their own dictionary. Given a noisy low-resolution image, sparse representations of low-resolution patches via trained low-dictionary are computed, then the high-resolution image can be reconstructed from high-resolution patches with the help of the related low-resolution sparse representations and trained high-dictionary, after global optimization a clean high-resolution is obtained to accomplish the goal of image super-resolution and denosing simultaneously. The experiments show that zooming low-resolution image to a middle-resolution using locally adaptive zooming algorithm for extracting features can get a better reconstructed image than bicubic interpolation algorithm. By setting the parameter λ, we can obtain the best performance both in super-resolution and denoising with absolute advantages in image quality and visual effect, which demonstrates the validity and robustness of our algorithm.
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