光电子快报(英文版), 2019, 15 (2): 156, Published Online: Apr. 16, 2019
Single image super-resolution reconstruction usingmultiple dictionaries and improved iterative back-projection
Abstract
In order to improve the super-resolution reconstruction effect of the single image, a novel multiple dictionaries learn-ing via support vector regression (SVR) and improved iterative back-projection (IBP) are proposed. To characterize the image structure, the low-frequency dictionary is constructed from the normalized brightness of low-frequency im-age patches in a discrete-cosine-transform (DCT) domain. Pixels determined by Gaussian weighting are added to the input vector to restore more high-frequency information when training the high-frequency image patch dictionary in the space domain. During post-processing, the improved IBP is employed to reduce regression errors each time. Ex-periment results show that the peak signal-to-noise ratio (PSNR)and structural similarity (SSIM) of the proposed method are enhanced by 1.6%—5.5% and 1.5%—13.1% compared with those of bicubic interpolation, and the pro-posed method visually outperforms several algorithms.
ZHAO Jian-wen, YUAN Qi-ping, QIN Juan, YANG Xiao-ping, CHEN Zhi-hong. Single image super-resolution reconstruction usingmultiple dictionaries and improved iterative back-projection[J]. 光电子快报(英文版), 2019, 15(2): 156.