Pregled bibliografske jedinice broj: 721751
Restoration of images corrupted by mixed Gaussian-impulse noise by iterative soft-hard thresholding
Restoration of images corrupted by mixed Gaussian-impulse noise by iterative soft-hard thresholding // Proceedings of the 22nd European Signal Processing Conference (EUSIPCO), 2014
Lisabon, Portugal, 2014. str. 1637-1641 (poster, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
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Naslov
Restoration of images corrupted by mixed Gaussian-impulse noise by iterative soft-hard thresholding
Autori
Filipović, Marko ; Jukić, Ante
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Proceedings of the 22nd European Signal Processing Conference (EUSIPCO), 2014
/ - , 2014, 1637-1641
Skup
22nd European Signal Processing Conference (EUSIPCO 2014)
Mjesto i datum
Lisabon, Portugal, 01.09.2014. - 05.09.2014
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
Denoising ; Impulse Noise ; Sparse Representation ; Dictionary ; Thresholding
Sažetak
We address the problem of restoration of images which have been affected by impulse or a combination of impulse and Gaussian noise. We propose a patch-based approach that exploits approximate sparse representations of image patches in learned dictionaries. For every patch, sparse representation in a dictionary is enforced by l1 -norm penalty, and sparsity of the residual is enforced by l0 -quasi-norm penalty. The obtained non-convex problem is solved iteratively by a combination of soft and hard thresholding, and a proof of convergence to a local minimum is given. Experimental evaluation suggests that the proposed approach can produce state-of-the-art results for some types of images, especially in terms of the structural similarity (SSIM) measure. In addition, the proposed iterative thresholding algorithm could possibly be applied to general inverse problems.
Izvorni jezik
Engleski
Znanstvena područja
Matematika
POVEZANOST RADA
Ustanove:
Institut "Ruđer Bošković", Zagreb