Abstract: A method and system for determining surface topology of a three-dimensional (3D) structure, based on a structured pattern that is projected onto the surface structure, and images of the pattern superposed on the structured surface are analysed to provide surface coordinates of the structure. The pattern comprises a plurality of unique color edges defined between pairs of differently-colored stripes, which substantially overcomes ambiguity problems. In one embodiment, a calibration method is provided enabling the surface coordinates to be obtained from a single image of the structure.

Abstract: A picture display device of the index type comprises a cathode ray tube (1) and a display window with a display screen (10) having phosphor patterns comprising parallel aligned phosphor lines (R,G,B), and with an index system (20) having a plurality of index elements (21) extending substantially parallel to the phosphor lines. The electron beam(s) (6,7,8) are deflected across the display screen (10) parallel to the phosphor lines and along and across the phospor lines. The display device has no color selection electrode in front of the display screen. The phosphor lines are arranged in the color sequence A-B-C-B-A-B-C, etc., where A, B and C stand for red, green and blue phosphors or any mutation of said colors, and, in operation, the video lines overlap such that each B phosphor line is written in a single video line and each A and C phosphor line is written by two video lines.

Abstract: A system for displaying a color broadcast television signal is provided. The system employs a cathode ray tube (CRT) which has only one electron gun and does not have a mask. The faceplate of the CRT has red, green, and blue phosphor stripes which form triads. A beam positioning gap, which may be patterned, is associated with each triad. By scanning the tube's electron beam along the beam positioning gap, vertical position information is obtained which is then used to accurately position the beam on the phosphor stripes as the stripes are scanned. Flyback of the electron beam can be avoided by scanning the phosphor stripes and the beam positioning gap in a serpentine pattern.