N-dimensional filter and method for n-dimensionally filtering an original image pixel

摘要

The invention relates to known N-dimensional filters (100) and methods for N-dimensionally filtering for applying noise reduction to an original image pixel. However, carrying out only noise reduction to a pixel of an image is often not enough when a good picture quality is required. Thus, additionally sharpness enhancement (peaking) is carried out. However, noise reduction and peaking have contrasting spectral behaviors which leads to non-optimal results when both operations noise reduction and peaking are implemented in series. Starting from that prior art it is the object of the invention to provide noise reduction and sharpness enhancement to the original pixel in an easier and cheaper manner. This object is solved according to the present invention by defining coefficients alpha(p, n) or beta(p, n) of said transmission function such that the transmission function is capable of applying noise reduction as well as sharpness enhancement to the input signal of said N-dimensional filter (100).