A trous filter
Thepurposeofthispluginistoremovethenoisepresentintheoriginalimagebythresholdingthewaveletcoefficients.Thispluginperformsthe'atrous'wavelettransformoneverysizeofimageandonasimulatedimageofthesamesizewithagaussiannoiseofstd_dev=1.Weassumethatthestandarddeviationatea