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   -> Volume 7, Issue 4


Preprint: Projections of ICT denoising based on wavelet maxima
 
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applma@cqu.edu.cn
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PostPosted: Fri Mar 27, 1998 9:04 am    
Subject: Preprint: Projections of ICT denoising based on wavelet maxima
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#3 Preprint: Projections of ICT denoising based on wavelet maxima

Abstract
Industrial Computerized Tomography (ICT) is
different from medical computerized tomography. The density of
industrial components are high, and the construction of industrial
components are complex. In ICT, we scan the industrial component with
rays from different directions. From projections, we reconstruct the
image of a cross section of the industrial component. ICT be use for
non-damage detection of industrial components. ICT can be applied on
space and aeronautical engineering, machine building, oil detection
,et..

Because the effect of physics factors, there is
noise in projections .After reconstruction of image, the noise will be
enhanced. And, the white noise in projections can be transformed into
non-white noise in reconstructed image. How to reduce the noise in a
image of ICT and not damage the edge of the image, is a difficult
question of image process. Wavelet transform maxima can describe the
different singularities of the edge signal and the noise . So, wavelet
transform maxima can filter the noise and keep the edge signal
. Firstly, we filter projections by wavelet transform maxima.
Secondly, we reconstruct image of ICT. These method can reduce the
noise in the image of ICT and can filter the non-white noise.
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