Abstract: A method and apparatus are disclosed for enhancing the contrast of a digital image bya) 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) modifying each pixel of each-detail image or each detail coefficient according to at least one non-linear monotonically increasing odd conversion function,c) constructing said processed image by accumulating detail obtained from said modified detail images or from said detail coefficients, and further adding said residual image.

Abstract: In the digital processing of radiographic images, interpretation of the image is aided by converting the pixels of an original radiographic image into electrical signals generally corresponding to the densities of the individual pixels and adjusting the electrical signals for the pixels constituting a diagnostically non-relevant image zone, selectively of the pixels constituting a diagnostically relevant image zone, as determined by observation of a visualization of the original radiographic images, e.g. by a radiologist viewing such image on the screen of a viewing monitor, to a density level such that when the electrical signals including the adjusted signals are visualized into an image for interpretation, the pixels of the diagnostically non-relevant zone are effectively masked out and light from the non-relevant zone is prevented from interfering with viewing of the relevant zone. Various predetermined configurations, e.g.