Problem. The accuracy of block-matching is significantly impaired by the presence of noise.
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Solution. We do coarse denoising prior to block-matching, which is embedded in our distance measure
![MATH](article_v6__11.png)
where
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![](http://www.cs.tut.fi/~dabov/3D-DFT/swptransparent.gif) is a 2D linear unitary transform operator,
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![](http://www.cs.tut.fi/~dabov/3D-DFT/swptransparent.gif) is a hard-threshold operator,
![MATH](article_v6__14.png)
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