&lt;title&gt;Hit-noise reduction in portal images: a comparison between wavelet- and rank-order-based methods&lt;/title&gt;

Dallas, William J.; Gross, E. J.; Roehrig, Hans; Vogelsong, T. L.

doi:10.1117/12.274109

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“…dose not converted all the x-ray photons to the visible light). Then this penetrated x-ray photos strike the light sensitive array, where this portion of the x-ray photons when strike the light sensing array will create a signal in the array, which will be much larger than that of a visible light photon due to the much higher energy of the x-ray photons [4]. The result is a bright (white) spots in some locations on the resulted image, which look like a salt has been shaken onto a photograph.…”

Section: Introductionmentioning

confidence: 99%

Hit Noise Reduction in Some X-Ray Images

Al-Zuky¹,

Kzar²

2009

JNUS

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The imaging system we have investigating suffer from the appearance of scattered bright points. A usual solution to reduce this noise can be achieved by an increase in exposure but it is very difficult to prevent the hits. In present study, we have investigating algorithms to reduce noise with out an increase in exposure by adopting four digital filters for noise reduction and comparing between efficiency of each filter to determine an efficient method. The resulting images and fidelity criteria showed that the median filter smoothes hit noise while maintaining edge information, but the mean filter image is a blurred version of the noisy image.

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Section: Introductionmentioning

confidence: 99%