An adaptive chrominance separator is provided which responds to horizontal high frequency luminance detail as well as to vertical chrominance detail. The luminance and chrominance levels are detected and an adaptive decision is made, depending upon the relative levels, of whether to use a bandpass filter,...http://www.google.fr/patents/US4688080?utm_source=gb-gplus-shareBrevet US4688080 - Multi-standard adaptive chrominance separator
