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1. WO1990007842 - COMPENSATION OF LOSSES AND DEFECTS IN TELECINE DEVICES

Publication Number WO/1990/007842
Publication Date 12.07.1990
International Application No. PCT/GB1989/001539
International Filing Date 22.12.1989
Chapter 2 Demand Filed 18.06.1990
IPC
H04N 3/20 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
3Scanning details of television systems; Combination thereof with generation of supply voltages
10by means not exclusively optical-mechanical
16by deflecting electron beam in cathode-ray tube
20Prevention of damage to cathode-ray tubes in event of failure of scanning
H04N 5/257 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
222Studio circuitry; Studio devices; Studio equipment
257Picture signal generators using flying-spot scanners
H04N 17/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
17Diagnosis, testing or measuring for television systems or their details
CPC
H04N 17/002
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
17Diagnosis, testing or measuring for television systems or their details
002for television cameras
H04N 3/20
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
3Scanning details of television systems; Combination thereof with generation of supply voltages
10by means not exclusively optical-mechanical
16by deflecting electron beam in cathode-ray tube ; , e.g. scanning corrections
20Prevention of damage to cathode-ray tubes in the event of failure of scanning
H04N 5/257
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
222Studio circuitry; Studio devices; Studio equipment ; ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
257Picture signal generators using flying-spot scanners
Applicants
  • RANK CINTEL LIMITED [GB]/[GB] (AllExceptUS)
  • MEAD, Terence, William [GB]/[GB] (UsOnly)
  • OSBORNE, Trevor, Malcolm [GB]/[GB] (UsOnly)
  • HUNT, Stuart [GB]/[GB] (UsOnly)
Inventors
  • MEAD, Terence, William
  • OSBORNE, Trevor, Malcolm
  • HUNT, Stuart
Agents
  • LLOYD, Patrick, Alexander, Desmond
Priority Data
8830205.423.12.1988GB
8913924.016.06.1989GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) COMPENSATION OF LOSSES AND DEFECTS IN TELECINE DEVICES
(FR) COMPENSATION DES PERTES ET DEFAUTS DANS DES APPAREILS DE TELECINEMA
Abstract
(EN)
A signal produced by a telecine suffers from losses and defects caused by difference in response to incident light of different areas of the screen area scanned. These differences may arise from burning of the screen, blemishes, dirt in the system, differences in grain size of phosphor particles, missing particles and losses in the internal optical system of the machine. The invention divides the scanning area into a correction map and devises for each area a correction factor based on the response of that area to incident illumination, where a defect is detected, video data from an adjacent area is substituted. Correction factors are held in a look-up RAM (50) and output to a multiplier (53) where they are multiplied with video data. The video data input to the multiplier (53) may be suppressed and a test pattern may be loaded into the multiplier. Burn at the ends of video lines may be reduced by reducing the intensity and/or dwell time of the scanning spot on any one area of the screen in the vicinity of the line end.
(FR)
Le signal que produit un appareil de télécinéma souffre de pertes et de défauts dus à des différences, en réponse à la lumière incidente des différentes zones de l'écarn balayé, qui peuvent provenir de rémanence d'images sur l'écran, de défauts et de saletés dans le système, de différences dans la taille des particules de phosphore, de particules manquantes et de pertes dans le système optique interne de l'appareil. On divise la zone de balayage en une carte de correction et on établit pour chaque zone un facteur de correction à partir de la réponse de cette zone à l'illumination incidente. La où un défaut est détecté, on lui substitue des données vidéo en provenance d'une zone adjacente. Les facteurs de correction sont enregistrés dans une mémoire à accès sélectif de consultation (50) et les données de sortie sont fournies à un multiplicateur (53) où elles sont multipliées avec les données vidéo. On peut supprimer l'apport des entrées de données vidéo au multiplicateur (53) pour charger dans ledit multiplicateur un signal d'essai. On peut réduire les rémanences d'images aux extrémités des lignes vidéo en réduisant l'intensité et/ou le temps d'arrêt du point de balayage sur toute zone de l'écran se trouvant à proximité de la fin de la ligne.
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