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Volumn 22, Issue 12, 2013, Pages 4598-4612

Learning doubly sparse transforms for images

Author keywords

compressed sensing; dictionary learning; image denoising; image representation; sparse representation; Sparsifying transforms; structured transforms

Indexed keywords

COMPRESSION STANDARDS; DICTIONARY LEARNING; DISCRETE COSINE TRANSFORM(DCT); IMAGE REPRESENTATIONS; K-SVD ALGORITHMS; PROBLEM FORMULATION; RECENT RESEARCHES; SPARSE REPRESENTATION;

EID: 84884838010     PISSN: 10577149     EISSN: None     Source Type: Journal    
DOI: 10.1109/TIP.2013.2274384     Document Type: Article
Times cited : (70)

References (59)
  • 1
    • 34249671661 scopus 로고    scopus 로고
    • Analysis versus synthesis in signal priors
    • DOI 10.1088/0266-5611/23/3/007, PII S0266561107384888, 007
    • M. Elad, P. Milanfar, and R. Rubinstein, "Analysis versus synthesis in signal priors," Inverse Problems, vol. 23, no. 3, pp. 947-968, 2007. (Pubitemid 46838835)
    • (2007) Inverse Problems , vol.23 , Issue.3 , pp. 947-968
    • Elad, M.1    Milanfar, P.2    Rubinstein, R.3
  • 2
    • 59749104367 scopus 로고    scopus 로고
    • From sparse solutions of systems of equations to sparse modeling of signals and images
    • A. M. Bruckstein, D. L. Donoho, and M. Elad, "From sparse solutions of systems of equations to sparse modeling of signals and images," SIAM Rev., vol. 51, no. 1, pp. 34-81, 2009.
    • (2009) SIAM Rev. , vol.51 , Issue.1 , pp. 34-81
    • Bruckstein, A.M.1    Donoho, D.L.2    Elad, M.3
  • 3
    • 33645712892 scopus 로고    scopus 로고
    • Compressed sensing
    • Apr
    • D. Donoho, "Compressed sensing," IEEE Trans. Inf. Theory, vol. 52, no. 4, pp. 1289-1306, Apr. 2006.
    • (2006) IEEE Trans. Inf. Theory , vol.52 , Issue.4 , pp. 1289-1306
    • Donoho, D.1
  • 4
    • 0029291966 scopus 로고
    • Sparse approximate solutions to linear systems
    • Apr
    • B. K. Natarajan, "Sparse approximate solutions to linear systems," SIAM J. Comput., vol. 24, no. 2, pp. 227-234, Apr. 1995.
    • (1995) SIAM J. Comput. , vol.24 , Issue.2 , pp. 227-234
    • Natarajan, B.K.1
  • 6
    • 0027814133 scopus 로고
    • Orthogonal matching pursuit: Recursive function approximation with applications to wavelet decomposition
    • Y. Pati, R. Rezaiifar, and P. Krishnaprasad, "Orthogonal matching pursuit: Recursive function approximation with applications to wavelet decomposition," in Proc. Asilomar Conf. Signals, Syst. Comput., vol. 1. 1993, pp. 40-44.
    • (1993) Proc. Asilomar Conf. Signals, Syst. Comput. , vol.1 , pp. 40-44
    • Pati, Y.1    Rezaiifar, R.2    Krishnaprasad, P.3
  • 7
    • 0027842081 scopus 로고
    • Matching pursuits with timefrequency dictionaries
    • Dec
    • S. G. Mallat and Z. Zhang, "Matching pursuits with timefrequency dictionaries," IEEE Trans. Signal Process., vol. 41, no. 12, pp. 3397-3415, Dec. 1993.
    • (1993) IEEE Trans. Signal Process. , vol.41 , Issue.12 , pp. 3397-3415
    • Mallat, S.G.1    Zhang, Z.2
  • 8
    • 65749110333 scopus 로고    scopus 로고
    • Subspace pursuit for compressive sensing signal reconstruction
    • May
    • W. Dai and O. Milenkovic, "Subspace pursuit for compressive sensing signal reconstruction," IEEE Trans. Inf. Theory, vol. 55, no. 5, pp. 2230-2249, May 2009.
    • (2009) IEEE Trans. Inf. Theory , vol.55 , Issue.5 , pp. 2230-2249
    • Dai, W.1    Milenkovic, O.2
  • 10
    • 0028805010 scopus 로고
    • Neuromagnetic source imaging with FOCUSS: A recursive weighted minimum norm algorithm
    • I. F. Gorodnitsky, J. George, and B. D. Rao, "Neuromagnetic source imaging with FOCUSS: A recursive weighted minimum norm algorithm," Electrocephalogr. Clin. Neurophysiol., vol. 95, no. 4, pp. 231-251, 1995.
    • (1995) Electrocephalogr. Clin. Neurophysiol. , vol.95 , Issue.4 , pp. 231-251
    • Gorodnitsky, I.F.1    George, J.2    Rao, B.D.3
  • 12
    • 80051633276 scopus 로고    scopus 로고
    • Cosparse analysis modeling-Uniqueness and algorithms
    • May
    • S. Nam, M. E. Davies, M. Elad, and R. Gribonval, "Cosparse analysis modeling - Uniqueness and algorithms," in Proc. IEEE ICASSP, May 2011, pp. 5804-5807.
    • (2011) Proc. IEEE ICASSP , pp. 5804-5807
    • Nam, S.1    Davies, M.E.2    Elad, M.3    Gribonval, R.4
  • 13
    • 84867617562 scopus 로고    scopus 로고
    • K-SVD dictionary-learning for the analysis sparse model
    • Mar.
    • R. Rubinstein, T. Faktor, and M. Elad, "K-SVD dictionary-learning for the analysis sparse model," in Proc. IEEE ICASSP, Mar. 2012, pp. 5405-5408.
    • (2012) Proc. IEEE ICASSP , pp. 5405-5408
    • Rubinstein, R.1    Faktor, T.2    Elad, M.3
  • 14
    • 84874754123 scopus 로고    scopus 로고
    • K-SVD dictionary-learning for the analysis sparse model
    • Jun.
    • R. Rubinstein and M. Elad, "K-SVD dictionary-learning for the analysis sparse model," in Proc. SPARS, Jun. 2011, p. 73.
    • (2011) Proc. SPARS , pp. 73
    • Rubinstein, R.1    Elad, M.2
  • 15
    • 1242352408 scopus 로고    scopus 로고
    • An algorithm for total variation minimization and applications
    • A. Chambolle, "An algorithm for total variation minimization and applications," J. Math. Imag. Vis., vol. 20, nos. 1-2, pp. 89-97, 2004.
    • (2004) J. Math. Imag. Vis. , vol.20 , Issue.1-2 , pp. 89-97
    • Chambolle, A.1
  • 16
    • 84867590112 scopus 로고    scopus 로고
    • Noise aware analysis operator learning for approximately cosparse signals
    • Mar.
    • M. Yaghoobi, S. Nam, R. Gribonval, and M. E. Davies, "Noise aware analysis operator learning for approximately cosparse signals," in Proc. IEEE ICASSP, Mar. 2012, pp. 5409-5412.
    • (2012) Proc. IEEE ICASSP , pp. 5409-5412
    • Yaghoobi, M.1    Nam, S.2    Gribonval, R.3    Davies, M.E.4
  • 17
    • 84873633867 scopus 로고    scopus 로고
    • Learning sparsifying transforms
    • Mar
    • S. Ravishankar and Y. Bresler, "Learning sparsifying transforms," IEEE Trans. Signal Process., vol. 61, no. 5, pp. 1072-1086, Mar. 2013.
    • (2013) IEEE Trans. Signal Process. , vol.61 , Issue.5 , pp. 1072-1086
    • Ravishankar, S.1    Bresler, Y.2
  • 19
    • 0346727379 scopus 로고    scopus 로고
    • Ridgelets: A key to higher-dimensional intermittency?"
    • E. J. Candès and D. L. Donoho, "Ridgelets: A key to higher-dimensional intermittency?" Phil. Trans. R. Soc. London A, vol. 357, no. 1760, pp. 2495-2509, 1999.
    • (1999) Phil. Trans. R. Soc. London A , vol.357 , Issue.1760 , pp. 2495-2509
    • Candès, E.J.1    Donoho, D.L.2
  • 20
    • 28944432472 scopus 로고    scopus 로고
    • The contourlet transform: An efficient directional multiresolution image representation
    • DOI 10.1109/TIP.2005.859376
    • M. N. Do and M. Vetterli, "The contourlet transform: An efficient directional multiresolution image representation," IEEE Trans. Image Process., vol. 14, no. 12, pp. 2091-2106, Dec. 2005. (Pubitemid 41781516)
    • (2005) IEEE Transactions on Image Processing , vol.14 , Issue.12 , pp. 2091-2106
    • Do, M.N.1    Vetterli, M.2
  • 22
    • 80054689517 scopus 로고
    • Hadamard transform image coding
    • Jan
    • W. K. Pratt, J. Kane, and H. C. Andrews, "Hadamard transform image coding," Proc. IEEE, vol. 57, no. 1, pp. 58-68, Jan. 1969.
    • (1969) Proc. IEEE , vol.57 , Issue.1 , pp. 58-68
    • Pratt, W.K.1    Kane, J.2    Andrews, H.C.3
  • 23
    • 0017552006 scopus 로고
    • A unified approach to short-time Fourier analysis and synthesis
    • Nov
    • J. B. Allen and L. R. Rabiner, "A unified approach to short-time Fourier analysis and synthesis," Proc. IEEE, vol. 65, no. 11, pp. 1558-1564, Nov. 1977.
    • (1977) Proc. IEEE , vol.65 , Issue.11 , pp. 1558-1564
    • Allen, J.B.1    Rabiner, L.R.2
  • 24
    • 0040165092 scopus 로고    scopus 로고
    • Practical aspects of the Moreau-Yosida regularization: Theoretical preliminaries
    • C. Lemaréchal and C. Sagastizábal, "Practical aspects of the Moreau- Yosida regularization: Theoretical preliminaries," SIAM J. Optim., vol. 7, no. 2, pp. 367-385, 1997.
    • (1997) SIAM J. Optim. , vol.7 , Issue.2 , pp. 367-385
    • Lemaréchal, C.1    Sagastizábal, C.2
  • 25
    • 0029938380 scopus 로고    scopus 로고
    • Emergence of simple-cell receptive field properties by learning a sparse code for natural images
    • DOI 10.1038/381607a0
    • B. A. Olshausen and D. J. Field, "Emergence of simple-cell receptive field properties by learning a sparse code for natural images," Nature, vol. 381, no. 6583, pp. 607-609, 1996. (Pubitemid 26177476)
    • (1996) Nature , vol.381 , Issue.6583 , pp. 607-609
    • Olshausen, B.A.1    Field, D.J.2
  • 27
    • 33750383209 scopus 로고    scopus 로고
    • K-SVD: An algorithm for designing overcomplete dictionaries for sparse representation
    • DOI 10.1109/TSP.2006.881199
    • M. Aharon, M. Elad, and A. Bruckstein, "K-SVD: An algorithm for designing overcomplete dictionaries for sparse representation," IEEE Trans. Signal Process., vol. 54, no. 11, pp. 4311-4322, Nov. 2006. (Pubitemid 44637761)
    • (2006) IEEE Transactions on Signal Processing , vol.54 , Issue.11 , pp. 4311-4322
    • Aharon, M.1    Elad, M.2    Bruckstein, A.3
  • 28
    • 66849115117 scopus 로고    scopus 로고
    • Dictionary learning for sparse approximations with the majorization method
    • Jun
    • M. Yaghoobi, T. Blumensath, and M. Davies, "Dictionary learning for sparse approximations with the majorization method," IEEE Trans. Signal Process., vol. 57, no. 6, pp. 2178-2191, Jun. 2009.
    • (2009) IEEE Trans. Signal Process. , vol.57 , Issue.6 , pp. 2178-2191
    • Yaghoobi, M.1    Blumensath, T.2    Davies, M.3
  • 29
    • 77953788888 scopus 로고    scopus 로고
    • Dictionary identification - Sparse matrixfactorization via l1-minimization
    • Jul
    • R. Gribonval and K. Schnass, "Dictionary identification - Sparse matrixfactorization via l1-minimization," IEEE Trans. Inf. Theory, vol. 56, no. 7, pp. 3523-3539, Jul. 2010.
    • (2010) IEEE Trans. Inf. Theory , vol.56 , Issue.7 , pp. 3523-3539
    • Gribonval, R.1    Schnass, K.2
  • 30
    • 76749107542 scopus 로고    scopus 로고
    • Online learning for matrix factorization and sparse coding
    • Mar.
    • J. Mairal, F. Bach, J. Ponce, and G. Sapiro, "Online learning for matrix factorization and sparse coding," J. Mach. Learn. Res., vol. 11, pp. 19-60, Mar. 2010.
    • (2010) J. Mach. Learn. Res. , vol.11 , pp. 19-60
    • Mairal, J.1    Bach, F.2    Ponce, J.3    Sapiro, G.4
  • 31
    • 77949403269 scopus 로고    scopus 로고
    • Recursive least squares dictionary learning algorithm
    • Apr
    • K. Skretting and K. Engan, "Recursive least squares dictionary learning algorithm," IEEE Trans. Signal Process., vol. 58, no. 4, pp. 2121-2130, Apr. 2010.
    • (2010) IEEE Trans. Signal Process. , vol.58 , Issue.4 , pp. 2121-2130
    • Skretting, K.1    Engan, K.2
  • 32
    • 77952714665 scopus 로고    scopus 로고
    • Dictionaries for sparse representation modeling
    • Jun
    • R. Rubinstein, A. M. Bruckstein, and M. Elad, "Dictionaries for sparse representation modeling," Proc. IEEE, vol. 98, no. 6, pp. 1045-1057, Jun. 2010.
    • (2010) Proc. IEEE , vol.98 , Issue.6 , pp. 1045-1057
    • Rubinstein, R.1    Bruckstein, A.M.2    Elad, M.3
  • 35
    • 33751379736 scopus 로고    scopus 로고
    • Image denoising via sparse and redundant representations over learned dictionaries
    • DOI 10.1109/TIP.2006.881969
    • M. Elad and M. Aharon, "Image denoising via sparse and redundant representations over learned dictionaries," IEEE Trans. Image Process., vol. 15, no. 12, pp. 3736-3745, Dec. 2006. (Pubitemid 44811686)
    • (2006) IEEE Transactions on Image Processing , vol.15 , Issue.12 , pp. 3736-3745
    • Elad, M.1    Aharon, M.2
  • 36
    • 39149089704 scopus 로고    scopus 로고
    • Sparse representation for color image restoration
    • Jan
    • J. Mairal, M. Elad, and G. Sapiro, "Sparse representation for color image restoration," IEEE Trans. Image Process., vol. 17, no. 1, pp. 53-69, Jan. 2008.
    • (2008) IEEE Trans. Image Process. , vol.17 , Issue.1 , pp. 53-69
    • Mairal, J.1    Elad, M.2    Sapiro, G.3
  • 37
    • 67349251766 scopus 로고    scopus 로고
    • Sparse and redundant modeling of image content using an image-signature-dictionary
    • M. Aharon and M. Elad, "Sparse and redundant modeling of image content using an image-signature-dictionary," SIAM J. Imag. Sci., vol. 1, no. 3, pp. 228-247, 2008.
    • (2008) SIAM J. Imag. Sci. , vol.1 , Issue.3 , pp. 228-247
    • Aharon, M.1    Elad, M.2
  • 38
    • 55149117992 scopus 로고    scopus 로고
    • Learning multiscale sparse representations for image and video restoration
    • J. Mairal, G. Sapiro, and M. Elad, "Learning multiscale sparse representations for image and video restoration," SIAM Multiscale Model. Simul., vol. 7, no. 1, pp. 214-241, 2008.
    • (2008) SIAM Multiscale Model. Simul. , vol.7 , Issue.1 , pp. 214-241
    • Mairal, J.1    Sapiro, G.2    Elad, M.3
  • 39
    • 78651068609 scopus 로고    scopus 로고
    • Image modeling and enhancement via structured sparse model selection
    • Sep.
    • G. Yu, G. Sapiro, and S. Mallat, "Image modeling and enhancement via structured sparse model selection," in Proc. 17th IEEE ICIP, Sep. 2010, pp. 1641-1644.
    • (2010) Proc. 17th IEEE ICIP , pp. 1641-1644
    • Yu, G.1    Sapiro, G.2    Mallat, S.3
  • 40
    • 51049085785 scopus 로고    scopus 로고
    • Sparse representations for limited data tomography
    • May
    • H. Y. Liao and G. Sapiro, "Sparse representations for limited data tomography," in Proc. IEEE ISBI, May 2008, pp. 1375-1378.
    • (2008) Proc. IEEE ISBI , pp. 1375-1378
    • Liao, H.Y.1    Sapiro, G.2
  • 41
    • 79955633431 scopus 로고    scopus 로고
    • MR image reconstruction from highly undersampled k-space data by dictionary learning
    • May
    • S. Ravishankar and Y. Bresler, "MR image reconstruction from highly undersampled k-space data by dictionary learning," IEEE Trans. Med. Imag., vol. 30, no. 5, pp. 1028-1041, May 2011.
    • (2011) IEEE Trans. Med. Imag. , vol.30 , Issue.5 , pp. 1028-1041
    • Ravishankar, S.1    Bresler, Y.2
  • 42
    • 84873664211 scopus 로고    scopus 로고
    • Multiscale dictionary learning for MRI
    • S. Ravishankar and Y. Bresler, "Multiscale dictionary learning for MRI," in Proc. ISMRM, 2011, p. 2830.
    • (2011) Proc. ISMRM , pp. 2830
    • Ravishankar, S.1    Bresler, Y.2
  • 44
    • 84863744151 scopus 로고    scopus 로고
    • Analysis operator learning for overcomplete cosparse representations
    • M. Yaghoobi, S. Nam, R. Gribonval, and M. Davies, "Analysis operator learning for overcomplete cosparse representations," in Proc. EUSIPCO, 2011, pp. 1470-1474.
    • (2011) Proc. EUSIPCO , pp. 1470-1474
    • Yaghoobi, M.1    Nam, S.2    Gribonval, R.3    Davies, M.4
  • 45
    • 84863759443 scopus 로고    scopus 로고
    • Sequential minimal eigenvalues-An approach to analysis dictionary learning
    • B. Ophir, M. Elad, N. Bertin, and M. Plumbley, "Sequential minimal eigenvalues - An approach to analysis dictionary learning," in Proc. EUSIPCO, 2011, pp. 1465-1469.
    • (2011) Proc. EUSIPCO , pp. 1465-1469
    • Ophir, B.1    Elad, M.2    Bertin, N.3    Plumbley, M.4
  • 46
    • 84876249547 scopus 로고    scopus 로고
    • Constrained overcomplete analysis operator learning for cosparse signal modelling
    • May
    • M. Yaghoobi, S. Nam, R. Gribonval, and M. E. Davies, "Constrained overcomplete analysis operator learning for cosparse signal modelling," IEEE Trans. Signal Process., vol. 61, no. 9, pp. 2341-2355, May 2013.
    • (2013) IEEE Trans. Signal Process. , vol.61 , Issue.9 , pp. 2341-2355
    • Yaghoobi, M.1    Nam, S.2    Gribonval, R.3    Davies, M.E.4
  • 48
    • 36849088522 scopus 로고    scopus 로고
    • Sparse MRI: The application of compressed sensing for rapid MR imaging
    • DOI 10.1002/mrm.21391
    • M. Lustig, D. Donoho, and J. Pauly, "Sparse MRI: The application of compressed sensing for rapid MR imaging," Magn. Resonance Med., vol. 58, no. 6, pp. 1182-1195, 2007. (Pubitemid 350234205)
    • (2007) Magnetic Resonance in Medicine , vol.58 , Issue.6 , pp. 1182-1195
    • Lustig, M.1    Donoho, D.2    Pauly, J.M.3
  • 49
    • 34249017511 scopus 로고    scopus 로고
    • K-t SPARSE: High frame rate dynamic MRI exploiting spatio-temporal sparsity
    • M. Lustig, J. M. Santos, D. L. Donoho, and J. M. Pauly, "k-t SPARSE: High frame rate dynamic MRI exploiting spatio-temporal sparsity," in Proc. ISMRM, 2006, p. 2420.
    • (2006) Proc. ISMRM , pp. 2420
    • Lustig, M.1    Santos, J.M.2    Donoho, D.L.3    Pauly, J.M.4
  • 50
    • 78349258863 scopus 로고    scopus 로고
    • Double sparsity: Learning sparse dictionaries for sparse signal approximation
    • Mar
    • R. Rubinstein, M. Zibulevsky, and M. Elad, "Double sparsity: Learning sparse dictionaries for sparse signal approximation," IEEE Trans. Signal Process., vol. 58, no. 3, pp. 1553-1564, Mar. 2010.
    • (2010) IEEE Trans. Signal Process. , vol.58 , Issue.3 , pp. 1553-1564
    • Rubinstein, R.1    Zibulevsky, M.2    Elad, M.3
  • 51
    • 80051739900 scopus 로고    scopus 로고
    • Multi-scale dictionary learning using wavelets
    • Sep
    • B. Ophir, M. Lustig, and M. Elad, "Multi-scale dictionary learning using wavelets," IEEE J. Sel. Topics Signal Process., vol. 5, no. 5, pp. 1014-1024, Sep. 2011.
    • (2011) IEEE J. Sel. Topics Signal Process. , vol.5 , Issue.5 , pp. 1014-1024
    • Ophir, B.1    Lustig, M.2    Elad, M.3
  • 52
    • 0000660321 scopus 로고    scopus 로고
    • Blind source separation by sparse decomposition in a signal dictionary
    • DOI 10.1162/089976601300014385
    • M. Zibulevsky and B. A. Pearlmutter, "Blind source separation by sparse decomposition in a signal dictionary," Neural Comput., vol. 13, no. 4, pp. 863-882, 2001. (Pubitemid 33594308)
    • (2001) Neural Computation , vol.13 , Issue.4 , pp. 863-882
    • Zibulevsky, M.1    Pearlmutter, B.A.2
  • 54
    • 0036660145 scopus 로고    scopus 로고
    • Quicksort asymptotics
    • DOI 10.1016/S0196-6774(02)00216-X, PII S019667740200216X
    • J. A. Fill and S. Janson, "Quicksort asymptotics," J. Algorithms, vol. 44, no. 1, pp. 4-28, 2002. (Pubitemid 35167314)
    • (2002) Journal of Algorithms , vol.44 , Issue.1 , pp. 4-28
    • Fill, J.A.1    Janson, S.2
  • 55
    • 77951942183 scopus 로고    scopus 로고
    • Image restoration through L0 analysis-based sparse optimization in tight frames
    • Nov.
    • J. Portilla, "Image restoration through L0 analysis-based sparse optimization in tight frames," in IEEE ICIP, Nov. 2009, pp. 3909-3912.
    • (2009) IEEE ICIP , pp. 3909-3912
    • Portilla, J.1
  • 56
    • 84875861443 scopus 로고    scopus 로고
    • Learning doubly sparse transforms for image representation
    • Sep./Oct.
    • S. Ravishankar and Y. Bresler, "Learning doubly sparse transforms for image representation," in Proc. IEEE Int. Conf. Image Process., Sep./Oct. 2012, pp. 685-688.
    • (2012) Proc. IEEE Int. Conf. Image Process. , pp. 685-688
    • Ravishankar, S.1    Bresler, Y.2
  • 57
    • 84885837208 scopus 로고    scopus 로고
    • M. Elad. (2009). Michael Elad Personal Page [Online]. Available: http://www.cs.technion.ac.il/~elad/Various/KSVD-Matlab-ToolBox.zip
    • (2009) Michael Elad Personal Page
    • Elad, M.1
  • 58
    • 84884890128 scopus 로고    scopus 로고
    • (accessed 2012 Oct. 9)
    • R. Rubinstein. (accessed 2012, Oct. 9) [Online]. Available: http://www.cs.technion.ac.il/~ronrubin/Software/ksvdsbox11.zip
    • Rubinstein, R.1
  • 59
    • 34547760736 scopus 로고    scopus 로고
    • Image denoising by sparse 3-D transform-domain collaborative filtering
    • DOI 10.1109/TIP.2007.901238
    • K. Dabov, A. Foi, V. Katkovnik, and K. Egiazarian, "Image denoising by sparse 3-D transform-domain collaborative filtering," IEEE Trans. Image Process., vol. 16, no. 8, pp. 2080-2095, Aug. 2007. (Pubitemid 47225460)
    • (2007) IEEE Transactions on Image Processing , vol.16 , Issue.8 , pp. 2080-2095
    • Dabov, K.1    Foi, A.2    Katkovnik, V.3    Egiazarian, K.4


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