DocumentCode :
590646
Title :
Image restoration with union of directional orthonormal DWTs
Author :
Muramatsu, Shigeki ; Aizawa, Natsuki ; Yukawa, Masahiro
Author_Institution :
Dept. of Electr. & Electron. Eng., Niigata Univ., Niigata, Japan
fYear :
2012
fDate :
3-6 Dec. 2012
Firstpage :
1
Lastpage :
4
Abstract :
This work proposes to apply directional lapped orthogonal transforms to image restoration. A DirLOT is an orthonormal transform of which basis is allowed to be anisotropic with the symmetric, real-valued and compact-support property. In this work, DirLOTs are used to generate symmetric orthonormal discrete wavelet transforms and then a redundant dictionary as a union of unitary transforms. The multiple directional property is suitable for representing natural images which contain diagonal edges and textures. The performances of deblurring, super-resolution and inpainting are evaluated for several images with the iterative-shrinkage/thresholding algorithm. It is verified that the proposed dictionary yields comparable or superior restoration performance to the non-subsampled Haar transform.
Keywords :
Haar transforms; discrete wavelet transforms; image representation; image resolution; image restoration; image texture; iterative methods; natural scenes; DirLOT; diagonal edge; directional lapped orthogonal transform; directional orthonormal DWT; directional property; image deblurring; image inpainting; image restoration; image super-resolution; image texture; iterative-shrinkage/thresholding algorithm; natural image representation; nonsubsampled Haar transform; redundant dictionary; symmetric orthonormal discrete wavelet transform; unitary transforms; Dictionaries; Discrete wavelet transforms; Image resolution; Image restoration; MATLAB; Vectors; DirLOT; deblurring; inpainting; iterative-shrinkage/thresholding algorithm; sparse representation; super-resolution;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal & Information Processing Association Annual Summit and Conference (APSIPA ASC), 2012 Asia-Pacific
Conference_Location :
Hollywood, CA
Print_ISBN :
978-1-4673-4863-8
Type :
conf
Filename :
6411793
Link To Document :
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