Method for space-time filtering of noise in radiography

Details Method for space-time filtering of noise in radiography Method for space-time filtering of noise in radiography

2008-05-27

2008-05-27

Wu, Jingge (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S132000, C382S261000, C382S262000, C382S279000, C378S004000

Reexamination Certificate

active

07379615

ABSTRACT:
To reduce the fluoroscopic noise in an image I acquired at a date t, the pixels of this image are paired with the pixels of an image I′ acquired at a date t−1. For a pixel with coordinates (x,y) of the image I, a convolution is done with a core U equivalent to a low-pass filter whose coefficients have been modified as a function of the neighborhood of the pixel with coordinates (x,y) in the image I. For the pixel paired in the image I′, a convolution is done with the core U whose coefficients have been modified as a function of the neighborhood of the pixel with coordinates (x,y) in the image I′. The result of the two convolutions is associated linearly in order to obtain a filtered value for the pixel with coordinates (x,y). These operations are repeated for each pixel of the image I.

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