Abstract
Single image super resolution (SR) aims to reconstruct a high resolution (HR) image from a low resolution (LR) image. However, many SR methods are only designed for the grayscale images. As a result, when dealing with the color images, the cross-channel information is often ignored by those approaches. In this paper, we propose a color image SR method by taking the cross-channel correlation of color images into consideration. In our method, the gradients of the differences between color channels are required to be sparse. In addition, to make our SR framework more robust, the average signal of the three color channels is also enforced to be sparse in the gradient domain. Finally, to solve the optimization problem which includes the cross-channel-correlation-based regularization terms, an efficient algorithm is presented. Experimental results demonstrate the effectiveness of the proposed method quantitatively and visually.
This work was supported in part by Natural Science Foundation (NSF) of China under Grants 61761005 and 61761007, and in part by the NSF of Guangxi under Grants 2016GXNSFAA380154 and 2016GXNSFAA380216.
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Notes
- 1.
As bridge and man in Set14 are gray images, they are excluded from our experiments.
- 2.
The PSNR is measured on all the color channels; the SSIM is calculated on each channel, and the average value of three channels is reported.
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Chang, K., Mo, C., Li, M., Li, T., Qin, T. (2018). Color Image Super Resolution by Using Cross-Channel Correlation. In: Hong, R., Cheng, WH., Yamasaki, T., Wang, M., Ngo, CW. (eds) Advances in Multimedia Information Processing – PCM 2018. PCM 2018. Lecture Notes in Computer Science(), vol 11166. Springer, Cham. https://doi.org/10.1007/978-3-030-00764-5_43
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