Method and apparatus for temporal filtering of noise in an image sequence

摘要

The temporal filtering process removes noise from an X-ray image forming part of a sequence of images. The filtering uses a filtered anti-causal sample to reconstruct a noisy sample corresponding to a specified location in the current image. The reconstruction uses anti-causal linear combination of noisy samples and previous samples in the sequence obtained by preliminary linear causal filtering. The filtering uses weighting coefficients computed as a function of the causal gain determined from the inverse of the sum of coefficients associated with the causal linear filtering, and from an anti-causal continuity coefficient obtained from the probability of continuity of intensity between the anti-causal sample and the filtered previous sample.