Video color display system

A video color display system for displaying on a color cathode-ray tube, a first image provided from raw video conjointly with a second image called synthetic image made of symbols representative of specific data, said system comprising

• ancillary radar means for providing said raw video representative of a radar map and processing means for converting the said raw video into X and Y radar video numerical signals with a view to a line-by-line scan and for selecting these signals as a function of predetermined selection parameters;
• display means comprising said color cathode-ray tube which is of the penetration type, and a very high voltage supply of the switchable type for supplying a very high voltage to said tube;
• memory means for storing separately said selected video signals and comprising k layers each having a capacity of n.sub.1 .times. n.sub.2 bits to produce a radar image constituting said first image having n.sub.1 lines with n.sub.2 dots per line in the course of a frame scan and to code the said radar signals on k bits for each dot, the said processing means providing at most 2.sup.k separate allotments as a function of the said selection parameters;
• vector and alphanumeric symbol generating means for providing symbol video signals with a view to a random scan;
• scan generating means for providing the said respective random and line-by-line scans successively;
• and
• shade selection means comprising control means for controlling said very high voltage supply for providing a predetermined color display for the said synthetic image and for displaying the said X and Y video signals in a plurality of separate shades in at least one color, the said shades corresponding respectively to separate store allotments in said memory.