1. A method of noise reduction of a video image being composed of succeeding pictures, the method comprising: consecutively calculating a respective delta value (Δ) for each pixel in a present picture of the succeeding pictures from a function of weighted pixels in said present picture and in a reference picture relative to said present picture; adjusting said respective delta value to a corresponding respective adjusted delta value (Δ′) according to an amount of high frequency content in said present picture and in said reference picture; and adding said respective adjusted delta value for each respective pixel in said present picture, the consecutively calculating said delta value comprising: providing a first version of said function of weighted pixels, weighted towards temporal filtering, providing a second version of said function of weighted pixels, weighted towards spatial filtering, and selecting the version to use in dependency on the difference between each version of the delta value and the pixel value in the same pixel position in the former picture.