Artifacts suppression in images and video. Volodymyr Fedak. Introduction. What is the problem? Why is it important? What did I do? What are the results? So what next?. What is the problem?. blocking ringing blurring flickering. What is the problem?. F - 2. F - 1. F. F + 1. F + 2.
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postprocessingWhy is it important ?
NLM is an improvement of Bilateral filtering
C(y, x) - geometric relationship
S(I(y), I(x)) - luminance ratio
I(y) – pixel luminance
NLM could be presented: by Alan and Liew
in general way:
in terms of implementation:
v(i) – noisy image
W(i, j) - weighted average of pixels in the image
v(j) – pixel luminanceNon-Local Means
N(x) - window surrounding pixel x;
Q(x) is a search window around pixel x;