pb.add(new Integer(Math.max(2 * (int) (denoiseLevel * scale) + 1, 3)));
denoiser = JAI.create("MedianFilter", pb, mfHints);
RenderingHints layoutHints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, Functions.getImageLayout(ystImage));
pb = new ParameterBlock();
pb.addSource(y);
pb.addSource(denoiser);
layoutHints.add(JAIContext.noCacheHint);
RenderedOp denoisedyst = JAI.create("BandMerge", pb, layoutHints);
pb = new ParameterBlock();