New learning based super-resolution: use of DWT and IGMRF prior

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
Prakash P Gajjar, Manjunath V Joshi

Abstract

In this paper, we propose a new learning-based approach for super-resolving an image captured at low spatial resolution. Given the low spatial resolution test image and a database consisting of low and high spatial resolution images, we obtain super-resolution for the test image. We first obtain an initial high-resolution (HR) estimate by learning the high-frequency details from the available database. A new discrete wavelet transform (DWT) based approach is proposed for learning that uses a set of low-resolution (LR) images and their corresponding HR versions. Since the super-resolution is an ill-posed problem, we obtain the final solution using a regularization framework. The LR image is modeled as the aliased and noisy version of the corresponding HR image, and the aliasing matrix entries are estimated using the test image and the initial HR estimate. The prior model for the super-resolved image is chosen as an Inhomogeneous Gaussian Markov random field (IGMRF) and the model parameters are estimated using the same initial HR estimate. A maximum a posteriori (MAP) estimation is used to arrive at the cost function which is minimized using a simple gradient descent approach. We demonstrate the effectiveness of the proposed appr...Continue Reading

References

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Citations

Sep 24, 2014·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Yuan-Kai Wang, Ching-Tang Fan
Dec 19, 2013·IEEE Transactions on Cybernetics·Xiaoqiang Lu, Xuelong Li
Aug 19, 2014·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Junjun JiangZhen Han
Jun 16, 2011·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Lina J KaramZoran A Ivanovski
Jun 3, 2011·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Aranzazu JurioHumberto Bustince
Jun 24, 2017·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Reuben A Farrugia, Christine Guillemot
May 6, 2017·IEEE Transactions on Cybernetics·Licheng LiuLong Chen

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