Dynamic Noise Reduction for High Quality Colour Video
R.J. Green · The Journal of Photographic Science · 1987
The passage of noise through a composite colour video system is considered. Even when a channel is considered “clean”, the noise from head amplifiers moves from one colour channel to the others via “cross-matricing”. Dynamic noise reduction is possible using selective filtering of low information content signals. Filters which incorporate bandwidth switching are considered, using a one or two step approach. The latter is shown to be a more versatile technique.