A method and apparatus for noise reduction

摘要

A noise reducing method and associated apparatus for use in a medical radiographic imaging system wherein an image represented by an array of pixels is processed and the processed image is recorded on a recording medium or visualised on a display monitor. The processing comprises the steps of a) decomposing said original image into a sequence of detail images or into an array of coefficients representing detail strength at multiple resolution levels and a residual image, b) pixelwise attenuating said detail images or said coefficient arrays according to the locally estimated amount of relevant signal present and in accordance with an estimated noise level, c) reconstructing said processed image by accumulating detail obtained from said attenuated detail images or from said attenuated detail coefficients, and further adding said residual image.