Wavelet-based image restoration for compact x-ray microscopy
2003 (English)In: Journal of Microscopy, ISSN 0022-2720, E-ISSN 1365-2818, Vol. 211, no 2, 154-160 p.Article in journal (Refereed) Published
Compact water-window X-ray microscopy with short exposure times will always be limited on photons owing to sources of limited power in combination with low-efficency X-ray optics. Thus, it is important to investigate methods for improving the signal-to-noise ratio in the images. We show that a wavelet-based denoising procedure significantly improves the quality and contrast in compact X-ray microscopy images. A non-decimated, discrete wavelet transform (DWT) is applied to original, noisy images. After applying a thresholding procedure to the finest scales of the DWT, by setting to zero all wavelet coefficients of magnitude below a prescribed value, the inverse DWT to the thresholded DWT produces denoised images. It is concluded that the denoising procedure has potential to reduce the exposure time by a factor of 2 without loss of relevant image information.
Place, publisher, year, edition, pages
2003. Vol. 211, no 2, 154-160 p.
compact X-ray microscopy, image restoration, wavelet denoising
IdentifiersURN: urn:nbn:se:kth:diva-6199ISI: 000184468300006OAI: oai:DiVA.org:kth-6199DiVA: diva2:10843
QC 201006162006-10-032006-10-032010-09-20Bibliographically approved