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Received：20 September 2018，
Revised：2019-2-27，
Published：16 June 2019
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目的
2
拍摄过程中，如果摄像机进行了错误的聚焦，就会得到模糊的图像，如何将模糊图像变得清晰成为一个亟待解决的问题。目前关于图像的去模糊方法多采用基于模糊核约束的卷积模型。但是由于实际应用中很难准确获取模糊核的信息，同时计算机也存在精度限制，计算结果与实际物理模型有偏差，因而去模糊的主要挑战为：如何精确地估计模糊核，以及如何在复原过程中减弱由于精度限制造成的振铃效应。
方法
2
振铃效应是指图像的灰度剧烈变化处产生的震荡，类似于钟被敲击后产生的波状空气震荡。在图像复原过程中，此效应通常发生在梯度变化较大的边缘区域附近。本文对此进行研究，在去模糊过程中引入边缘信息作为约束条件，以改善模糊核的估计，并通过抑制边缘区域的反卷积，抑制图像复原过程中的振铃效应。算法主要分为如下3个部分：1）设计了适用于模糊图像的边缘提取算法；2）利用边缘信息设计了加强边缘感知的反卷积算法；3）提出并设计了安全检测子，以保证算法在边缘区域复原的完整性。
结果
2
实验结果表明，在没有先验知识的情况下，本文方法可以较好地恢复图像细节，并有效抑制振铃效应。较之传统的去模糊处理算法，本文方法在性能上有较大提高。比如，相比于Chan、Krishnan以及Hu的方法，本文方法在峰值信噪比指标上分别提高了25.73%、3.52%和4.43%，在结构相似性指标上分别提高了7.67%、1.63%和3.59%。同时，与基于深度学习的方法相比，本文方法不依赖于数据集，鲁棒性更强。
结论
2
本文方法可以较好地恢复图像细节，并抑制振铃效应，同时比深度学习方法适用范围更广。
Objective
2
Image deblurring has been an active research area over the last decade. Image blurring may bring serious problems in our daily life. For example
almost all cities have installed electronic monitoring and controlling systems to capture various things on robbery
accident
or other useful information. When people and vehicles are moving fast
the captured images become blurry. Moreover
a camera that is out of focus causes image blurring. With the wide use of electrical camera equipment
blurring caused by movement and out of focus has become widespread. Thus
deblurring in traffic monitoring
astronomical remote sensing
and public security investigation has a great value.
Method
2
Although the topic of image blur analysis has attracted considerable attention in recent years
most previous works focus on solving the deblurring problem. On the contrary
general blur detection is seldom explored and remains far from practical application. In terms of blurring kernel
image deblurring algorithms can be divided into two categories:blind image deconvolution (BID) and non-blind image deconvolution (NBID). BID recovers the focused image with unknown blurring kernel. By contrast
the NBID deblurs image with known blurring kernel. In practice
the blurring kernel is often difficult to determine beforehand. Therefore
BID is more widely used than NBID. However
the blind deconvolution algorithm still has challenges:1) The first is how to estimate the blurring kernel accurately. The reason is that the blurring kernel is susceptible to noise
which might result in kernel misestimation. 2) The ringing artifacts may occur around prominent edges of the image. In this paper
we discuss these two challenges. We focus on a deblurring algorithm based on conspicuous edge detection. We propose a novel fused edge detection method based on the modified edge operators and morphological edge detection to improve the deblurring effect. The proposed algorithm accurately extracts the conspicuous edges. Then
we use conspicuous edges to estimate the blur kernel and deconvolve the image. Moreover
we obtain the gap mask and subtract it to retain the necessary gaps. The pixels are protected from being missing because abundant edge pixels are avoided. Results show that our scheme significantly enhances the deconvolution results especially for reducing the ringing artifacts.
Result
2
We compare our algorithm with Chan's
Krishnan's
and Hu's algorithms to evaluate its performance. First
the algorithms are tested on basic graphic elements
such as straight line
broken line
and curve. For the three elements
Chan's method causes several ringing artifacts. For the straight line
the edges remain blurred when processed using Krishnan's and Hu's methods. The blurred line processed by our method is sharp in the edge without ringing artifacts. For the broken line
Krishnan's method spreads the black points to the white region and crosses colors between each other. Hu's method shows no ringing artifacts and cross-color
but the vertex is round and not sharp enough. The element processed by our method has slight ringing artifacts in the border but remains sharp. For the curve
Krishnan's method also has drawbacks on cross-color between the black and white regions. In addition
the curve has become less smooth. Our method and Hu's method have achieved good results but with slight ringing artifacts under the curve. These comparisons show that our algorithm and Hu's algorithm obtain the best results for maintaining the sharpness and reducing the ringing artifacts. Second
we test these algorithms by using natural images. Results indicate that Chan's method has excellent details
but it has the most evident ringing artifacts. Krishnan's method has good deblurring results but most of them are too sharpened. Hu's method performs well on low-light images
but details are missing in the results. Our method has the least ringing artifacts at the edges and detailed region of the image. Experimental results demonstrate that our edge-aware deblurring algorithm can recover better image details and better suppress the ringing effect than conventional deblurring algorithms. In comparison with Chan's
Krishnan's
and Hu's methods
our proposed algorithm achieves the best accuracy in terms of
$$ {\mathrm{PSNR}}$$
(peak signal to noise ratio) and
$${\mathrm{SSIM}} $$
(structural similarity index). The average values of improved
$$ {\mathrm{PSNR}}$$
are 25.73%
3.52%
and 4.43%
respectively.
$${\mathrm{SSIM}} $$
values increase to 7.67%
1.63%
and 3.59%
respectively. The method proposed in this study is more general than other deep learning-based methods and has no dependence on datasets.
Conclusion
2
The results of our algorithm are better than those of conventional operator-based deblurring methods in either
$$ {\mathrm{PSNR}}$$
or
$${\mathrm{SSIM}} $$
. Our algorithm is superior to other algorithms in terms of reducing ringing artifacts.
Krishnan D, Tay T, Fergus R. Blind deconvolution using a normalized sparsity measure[C]//Proceedings of 2011 IEEE Conference on Computer Vision and Pattern Recognition. Colorado Springs, CO, USA: IEEE, 2011: 233-240.[ DOI: 10.1109/CVPR.2011.5995521 http://dx.doi.org/10.1109/CVPR.2011.5995521 ]
Xu L, Jia J Y. Two-phase kernel estimation for robust motion deblurring[C]//Proceedings of the 11th European Conference on Computer Vision. Heraklion, Crete, Greece: Springer, 2010: 157-170.[ DOI: 10.1007/978-3-642-15549-9_12 http://dx.doi.org/10.1007/978-3-642-15549-9_12 ]
Fergus R, Singh B, Hertzmann A, et al. Removing camera shake from a single photograph[C]//Proceedings of the ACM SIGGRAPH. Boston, Massachusetts: ACM, 2006: 787-794.[ DOI: 10.1145/1179352.1141956 http://dx.doi.org/10.1145/1179352.1141956 ]
Javaran T A, Hassanpour H, Abolghasemi V. Non-blind image deconvolution using a regularization based on re-blurring process[J]. Computer Vision and Image Understanding, 2017, 154:16-34.[DOI:10.1016/j.cviu.2016.09.013]
Yuan L, Sun J, et al. Progressive inter-scale and intra-scale non-blind image deconvolution[C]//Proceedings of the ACM SIGGRAPH. Los Angeles, California: AC M, 2008: #74.[ DOI: 10.1145/1399504.1360673 http://dx.doi.org/10.1145/1399504.1360673 ]
Richardson W H. Bayesian-based iterative method of image restoration[J]. Journal of the Optical Society of America, 1972, 62(1):55-59.[DOI:10.1364/JOSA.62.000055]
Yang H, Zhang Z B, Wu D Y, et al. Image deblurring using empirical wiener filter in the curvelet domain and joint non-local means filter in the spatial domain[J]. The Imaging Science Journal, 2014, 62(3):178-185.[DOI:10.1179/1743131X12Y.0000000040]
Richardson W H. Bayesian-based iterative method of image restoration[J]. Journal of the Optical Society of America, 1972, 62(1):55-59.[DOI:10.1364/JOSA.62.000055]
Lucy L B. An iterative technique for the rectification of observed distributions[J]. The Astronomical Journal, 1974, 79(6):745-754.[DOI:10.1086/111605]
Tikhonov A N, Arsenin V Y. Solutions of Ill-posed Problems[M]. New York:John Wiley&Sons, 1977:491-491.
Liu P F, Xiao L. A fast algorithm for image restoration based on Hessian nuclear norm regularization[J]. Acta Electronica Sinica, 2015, 43(10):2001-2008.
刘鹏飞, 肖亮.基于Hessian核范数正则化的快速图像复原算法[J].电子学报, 2015, 43(10):2001-2008. [DOI:10.3969/j.issn.0372-2112.2015.10.018]
Xu F, Yan X J, Huang C R, et al. Normalized convolution based super-resolution reconstruction using feature-driven prior[J]. Journal of Image and Graphics, 2014, 19(10):1514-1523.
徐枫, 严锡君, 黄陈蓉, 等.特征驱动先验的归一化卷积超分辨率重建[J].中国图象图形学报, 2014, 19(10):1514-1523. [DOI:10.11834/jig.20141014]
Gupta A, Joshi N, Zitnick C L, et al. Single image deblurring using motion density functions[C]//Proceedings of the 11th European Conference on Computer Vision. Heraklion, Crete, Greece: Springer, 2010: 171-184.[ DOI: 10.1007/978-3-642-15549-9_13 http://dx.doi.org/10.1007/978-3-642-15549-9_13 ]
Levin A, Fergus R, Durand F, et al. Image and depth from a conventional camera with a coded aperture[J]. ACM Transactions on Graphics, 2007, 26(3):#70.[DOI:10.1145/1276377.1276464]
Levin A, Weiss Y. User assisted separation of reflections from a single image using a sparsity prior[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 2007, 29(9):1647-1654.[DOI:10.1109/TPAMI.2007.1106]
Chen L, Yang G, Chen Z Y, et al. Linearized Bregman iteration algorithm for matrix completion with structural noise[J]. Chinese Journal of Computers, 2015, 38(7):1357-1371.
陈蕾, 杨庚, 陈正宇, 等.基于线性Bregman迭代的结构化噪声矩阵补全算法[J].计算机学报, 2015, 38(7):1357-1371. [DOI:10.11897/SP.J.1016.2015.01357]
Berger T, Stromberg J O, Eltoft T. Adaptive regularized constrained least squares image restoration[J]. IEEE Transactions on Image Processing, 1999, 8(8):1191-1203.
Welk M, Theis D, Weickert J. Variational deblurring of images with uncertain and spatially variant blurs[C]//Joint Pattern Recognition Symposium. Vienna, Austria: Springer, 2005: 485-492.[ DOI: 10.1007/11550518_60 http://dx.doi.org/10.1007/11550518_60 ]
Jia J Y. Single image motion deblurring using transparency[C]//Proceedings of 2007 IEEE Conference on Computer Vision and Pattern Recognition. Minneapolis, MN, USA: IEEE, 2007: 1-8.[ DOI: 10.1109/CVPR.2007.383029 http://dx.doi.org/10.1109/CVPR.2007.383029 ]
Joshi N, Szeliski R, Kriegman D J. PSF estimation using sharp edge prediction[C]//Proceedings of 2008 IEEE Computer Society Conference on Computer Vision and Pattern Recognition(CVPR 2008), 24-26 June 2008, Anchorage, Alaska, USA. IEEE, 2008.
Pan J S, Liu R S, Su Z X, et al. Kernel estimation from salient structure for robust motion deblurring[J]. Signal Processing:Image Communication, 2013, 28(9):1156-1170.[DOI:10.1016/j.image.2013.05.001]
Shan Q, Jia J Y, Agarwala A. High-quality motion deblurring from a single image[C]//Proceedings of the ACM SIGGRAPH. Los Angeles, California: ACM, 2008: #73.[ DOI: 10.1145/1399504.1360672 http://dx.doi.org/10.1145/1399504.1360672 ]
Cho T S, Joshi N, Zitnick C L, et al. A content-aware image prior[C]//Proceedings of 2010 IEEE Computer Society Conference on Computer Vision and Pattern Recognition. San Francisco, CA, USA: IEEE, 2010: 169-176.[ DOI: 10.1109/CVPR.2010.5540214 http://dx.doi.org/10.1109/CVPR.2010.5540214 ]
Haralick R M, Shapiro L G. Computer and Robot Vision[M]. Massachusetts, USA:Addison-Wesley, 1992:121-122.
Huang T S, Yang G J, Tang G Y. A fast two-dimensional median filtering algorithm[J]. IEEE Transactions on Acoustics, Speech, and Signal Processing, 1979, 27(1):13-18.[DOI:10.1109/TASSP.1979.1163188]
Almeida G L, Silvani M I, Souza E S, et al. A stopping criterion to halt iterations at the Richardson-Lucy deconvolution of radiographic images[C]//Proceedings of the 37th Brazilian Meeting on Nuclear Physics. Sao Paulo: IOP, 2015.[ DOI: 10.1109/CVPR.2014.432 http://dx.doi.org/10.1109/CVPR.2014.432 ]
Shi J P, Xu L, Jia J Y. Discriminative blur detection features[C]//Proceedings of 2014 IEEE Conference on Computer Vision and Pattern Recognition. Columbus, OH, USA: IEEE, 2014: 2965-2972.[ DOI: 10.1109/CVPR.2014.379 http://dx.doi.org/10.1109/CVPR.2014.379 ]
Chan S H, Khoshabeh R, Gibson K B, et al. An augmented Lagrangian method for total variation video restoration[J]. IEEE Transactions on Image Processing, 2011, 20(11):3097-3111.[DOI:10.1109/TIP.2011.2158229]
Hu Z, Cho S, Wang J, et al. Deblurring low-light images with light streaks[C]//Proceedings of 2014 IEEE Conference on Computer Vision and Pattern Recognition. Columbus, OH, USA: IEEE, 2014: 3382-3389.[ DOI: 10.1109/CVPR.2014.432 http://dx.doi.org/10.1109/CVPR.2014.432 ]
Xu L, Ren J S J, Liu C, et al. Deep convolutional neural network for image deconvolution[C]//Proceedings of the 27th International Conference on Neural Information Processing Systems. Montreal, Canada: ACM, 2014: 1790-1798.
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