Temporal noise analysis of a video signal

摘要

A method of determining noise characteristics of a video signal includes forming an array 33 of luminance and/or chrominance differences between picture elements of successive frames and determining an absolute difference value 34 between a luminance and/or chrominance difference of a picture element and an average of the luminance and/or chrominance differences of a plurality of neighbouring picture elements. Occurrences of predetermined ranges of the difference value are counted and a histogram may be formed of a number of occurrences in each range.