System for the processing of a sequence of noisy images and medi

Details System for the processing of a sequence of noisy images and medi System for the processing of a sequence of noisy images and medi

1998-04-03

2000-11-21

Lee, Thomas D.

Image analysis

Image enhancement or restoration

Image filter

382260, G06K 940

Patent

active

061514179

ABSTRACT:
The invention relates to a system for the processing of a noisy image in a sequence of noisy images which includes means for extracting a noisy temporal sample at a given location in the noisy image and for supplying a corresponding temporally filtered sample in order to form a noise-filtered image. The system includes recursive temporal filtering means which include means for forming a sum of a corresponding sample (Y.sub.t-1) of an already filtered preceding image of the sequence and a corresponding sample [.DELTA..sub.t (x,y)] of a difference image (S.sub.t -Y.sub.t-1) formed between the noisy image and the filtered preceding image and weighted by a recursion factor (K.sub.t); they also include two-dimensional spatial filtering means (F.sub.2D) which are applied to said difference image in order to enhance spatially coherent samples and to supply a measure of probability of motion (.beta..sub.t) which is linked to said spatially coherent samples, and means for applying a scalar function (f.sub.1) in order to generate said recursion factor (K.sub.t) in dependence on said measure of probability of motion (.beta..sub.t). The invention also relates to an X-ray examination apparatus including such a system.

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