Restoration of a high ISO-sensitivity color image with the shift-invariant Haar wavelet transform

Takahiro Saito; Daisuke Yamada; Takashi Komatsu

doi:10.1117/12.838562

18 January 2010 Restoration of a high ISO-sensitivity color image with the shift-invariant Haar wavelet transform

Takahiro Saito, Daisuke Yamada, Takashi Komatsu

Proceedings Volume 7537, Digital Photography VI; 75370A (2010) https://doi.org/10.1117/12.838562
Event: IS&T/SPIE Electronic Imaging, 2010, San Jose, California, United States

Abstract

Recently, R. H. Chan, T. F. Chan, L. Shen, and Z. Shen proposed an image-restoration method, referred to as the C²-S² method, in the shift-invariant Haar wavelet transform domain. The C²-S² method is suitable for image-restoration in a digital color camera and restores a sharp color image in a lightly noisy case; but in a heavily noisy case it produces colored artifacts originating from noise. In such a case, the image-restoration process should be split into a colorinterpolation stage, a denoising stage, and a deblurring stage; and along this line we present an approach to restore a high ISO-sensitivity color image. Our approach firstly de-mosaics observed color data with the bi-linear interpolation method, which is robust against observation noise but causes image blurs. Next, our approach applies our previouslyproposed spatially-adaptive soft color-shrinkage to each shift-invariant Haar wavelet coefficient of the demosaicked color-image, to produce a denoised color-image. Finally, our approach applies to the denoised color-image a colorimage restoration method that corresponds to an extension of the C²-S² method and employs our previously proposed soft color-shrinkage. The experimental simulations conducted on raw color data observed with a SLR digital color camera with 6400 ISO-sensitivity demonstrate that our approach restores a high-quality color image even in a high ISOsensitivity case, without producing noticeable artifacts.

Citation Download Citation

Takahiro Saito, Daisuke Yamada, and Takashi Komatsu "Restoration of a high ISO-sensitivity color image with the shift-invariant Haar wavelet transform", Proc. SPIE 7537, Digital Photography VI, 75370A (18 January 2010); https://doi.org/10.1117/12.838562

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KEYWORDS

Wavelet transforms

Wavelets

Image processing

Denoising

Cameras

Digital cameras

Linear filtering

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