| 摘要 |
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 (Yt-1) of an already filtered preceding image of the sequence and a corresponding sample [ DELTA t(x,y)] of a difference image (St-Yt-1) formed between the noisy image and the filtered preceding image and weighted by a recursion factor (Kt); they also include two-dimensional spatial filtering means (F2D) which are applied to said difference image in order to enhance spatially coherent samples and to supply a measure of probability of motion ( beta t) which is linked to said spatially coherent samples, and means for applying a scalar function (f1) in order to generate said recursion factor (Kt) in dependence on said measure of probability of motion ( beta t). The invention also relates to an X-ray examination apparatus including such a system. |
