1. A method for filtering image data, the method comprising: receiving image data, wherein the image comprises a plurality of pixels; defining, for each image pixel out of multiple image pixels of the plurality of pixels, an image region; dividing a frequency spectrum of each image region into at least three image region frequency range components; calculating an energy level for each of the image region frequency range components; comparing the energy level of each image region frequency range component to at least one frequency region threshold to provide a comparison result for each image region frequency range component, wherein each frequency region threshold is calculated based on an intensity parameter of an image section and based on an energy parameter of at least one reference image section; determining, a processing operation for each image region frequency range component, based on the comparison result associated with the image region frequency range component and based on a configurable decision rule, wherein the processing operation is selected from a filtering operation and a bypass operation; processing each image region frequency range component according to said determining to provide processed image data; and displaying a processed image based on the processed image data.