锚点领域回归与稀疏表示的图像超分辨率方法
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摘要
结合锚点领域回归与稀疏表示方法,提出一种改进的图像超分辨率方法。通过对高分辨率图像采用模糊和下采样操作生成低分辨率图像,基于锚点邻域回归的线性映射函数训练投影矩阵,利用稀疏表示的方法训练和学习稀疏字典对。在图像放大阶段,根据训练好的投影矩阵重建主要高频特征,利用稀疏字典对补充残差高频特征。实验结果表明,该方法能较好地保持图像的局部细节信息,减少块效应和伪影效应。
Combining anchored neighborhood regression and sparse representation methods,this paper proposes an image super-resolution method.By blurring and subsampling high-resolution image to generate low-resolution image,the linear mapping function based on anchored neighborhood regression is used to train the projection matrix,and sparse representation is used to train and learn sparse dictionary pairs.In the online image magnification stage,the main high frequency features are generated by using the trained projection matrix.Then,the sparse dictionary pairs are employed to reconstruct the residual high frequency features.Experimental results show that the proposed method can maintain the local detail information of the image,reduce the blocks and aliasing artifacts.
Combining anchored neighborhood regression and sparse representation methods,this paper proposes an image super-resolution method.By blurring and subsampling high-resolution image to generate low-resolution image,the linear mapping function based on anchored neighborhood regression is used to train the projection matrix,and sparse representation is used to train and learn sparse dictionary pairs.In the online image magnification stage,the main high frequency features are generated by using the trained projection matrix.Then,the sparse dictionary pairs are employed to reconstruct the residual high frequency features.Experimental results show that the proposed method can maintain the local detail information of the image,reduce the blocks and aliasing artifacts.
引文
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[13] YANG J,WRIGHT J,HUANG T S,et al.Image super-resolution via sparse representation[J].IEEE Transactions on Image Processing,2010,19(1):2861-2873.
[14] ZEYDE R,ELAD M,PROTTER M.On single image scale-up using sparse-representations[J].Lecture Notes in Computer Science,2010,6920:711-730.
[15] ZHANG Jian,ZHAO Chen,XIONG Ruiqin,et al.Image super-resolution via dual-dictionary learning and sparse representation[C]//Proceedings of IEEE International Symposium on Circuits and Systems.Washington D.C.,USA:IEEE Press,2012:1688-1691.
[16] TIAN Yapeng,ZHOU Fei,YANG Wenming.Anchored neighborhood regression based Single image super-resolution from self-examples[C]//Proceedings of IEEE International Conference on Image Processing.Washington D.C.,USA :IEEE Press,2016:2827-2831.
[17] WANG Zhou,BOVIK A,SHEIKH H.Image quality assessment:from error visibility to structural similarity[J].IEEE Transactions on Image Processing,2004,13(4):600-612.
[2] HUANG Jiabin.Exploiting self-similarities for single frame super-resolution[C]//Proceedings of Asian Conference on Computer Vision.Berlin,Germany:Springer,2011:497-510.
[3] FREEDMAN G,FATTAL R.Image and video upscaling from local self-examples[J].ACM Transactions on Graphics,2011,30(2):474-484.
[4] ZHANG Kaibing,GAO Xinbo,TAO Dacheng,et al.Single image super-resolution with multiscale similarity learning[J].IEEE Transactions on Neural Networks and Learning Systems,2013,24(10):1648-1659.
[5] CHANG Hong,XIONG Yimin.Super-resolution through neighbor embedding[C]//Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition.Washington D.C.,USA:IEEE Press,2004:275-282.
[6] BUADES A,COLL B,MOREL J M.A non-local algorithm for image denoising[C]//Proceedings of IEEE Computer Society Conference on Computer Vision and Pattern Recognition.Washington D.C.,USA:IEEE Press,2005:60-65.
[7] BEVILACQUA M,ROUMY A,GUILLEMOT C,et al.Single-image super-resolution via linear mapping of interpolated self-examples[J].IEEE Transactions on Image Processing,2014,23(12):5334-5347.
[8] TIMOFTE R,DE SMET V,VAN GOOL L.Anchored neighborhood regression for fast example-based super-resolution[C]//Proceedings of IEEE International Conference on Computer Vision.Washington D.C.,USA:IEEE Press,2013:1920-1927.
[9] TIMOFTE R,DE SMET V,VAN GOOL L.A+:adjusted anchored neighborhood regression for fast super-resolution[C]//Proceedings of Asian Conference on Computer Vision.Berlin,Germany:Springer,2014:111-126.
[10] TIMOFTE R,ROTHE R,VAN GOOL L.Seven ways to improve example-based single image super resolution[C]//Proceedings of IEEE Computer Society Conference on Computer Vision and Pattern Recognition.Washington D.C.,USA:IEEE Press,2016:1865-1873.
[11] DONG Chao,CHEN Chang,HE Kaiming,et al.Learning a deep convolutional network for image super-resolution[C]//Proceedings of European Conference on Computer Vision.Berlin,Germany:Springer,2014:184-199.
[12] 王晓晖,盛斌,申瑞民.基于深度学习的深度图超分辨率采样[J].计算机工程,2017,43(11):252-260.
[13] YANG J,WRIGHT J,HUANG T S,et al.Image super-resolution via sparse representation[J].IEEE Transactions on Image Processing,2010,19(1):2861-2873.
[14] ZEYDE R,ELAD M,PROTTER M.On single image scale-up using sparse-representations[J].Lecture Notes in Computer Science,2010,6920:711-730.
[15] ZHANG Jian,ZHAO Chen,XIONG Ruiqin,et al.Image super-resolution via dual-dictionary learning and sparse representation[C]//Proceedings of IEEE International Symposium on Circuits and Systems.Washington D.C.,USA:IEEE Press,2012:1688-1691.
[16] TIAN Yapeng,ZHOU Fei,YANG Wenming.Anchored neighborhood regression based Single image super-resolution from self-examples[C]//Proceedings of IEEE International Conference on Image Processing.Washington D.C.,USA :IEEE Press,2016:2827-2831.
[17] WANG Zhou,BOVIK A,SHEIKH H.Image quality assessment:from error visibility to structural similarity[J].IEEE Transactions on Image Processing,2004,13(4):600-612.