Video noise reducer

Abstract From the Canadian patent

In a video noise reducer, the problem of noise at the edges of moving objects is dealt with by the introduction - into those regions - of spatial noise reduction. An adaptive low pass filter works especially well for spatial noise reduction, with adaption by reference to a dynamic noise measurement. Also where pixel information is recursively filtered with recursion being disabled , at a disjuncture (caused by motion panning, shot-change or otherwise), recursively filtered pixel information prior to a disjuncture continues to be output until pixel information following the disjuncture has been recursively filtered to an appropriate degree of noise reduction.