A method for compensating for video image distortion on a cathode ray tube (CRT) is accomplished by determining the distortion occurring along one axis of deflection of the CRT electron beam. The distortion is determined by predicting the position of the electron beam during a particular scan along the...http://www.google.de/patents/US4673986?utm_source=gb-gplus-sharePatent US4673986 - Image distortion correction method and apparatus
