The Vision System

The colour TV system is based on the principle that with three suitable primary colours of light (red, green and blue) it is possible to reproduce white and a gamut of colours. The precise ‘colour’ one sees depends on the relative amounts of red, green and blue light.

In colour television the display tube on the colour monitor generates three separate red, green and blue (RGB) pictures, which produce an appropriate mixture at any point on the screen, and the viewer sees a particular colour. It is the colour camera’s function to derive the appropriate RGB signals which eventually feed to the display. Colour cameras use a light-splitting system behind the zoom lens; this splits the light into red, green and blue light, which ...

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