Edge enhancement for television images

Details Edge enhancement for television images Edge enhancement for television images

H - Electricity

04

N

350/103

H04N 3/32 (2006.01) H04N 5/14 (2006.01)

Patent

CA 1053793

ABSTRACT OF THE DISCLOSURE Method and apparatus for enhancing the edges of video images displayed on a cathode ray tube. The scanning velocity of the cathode ray tube electron beam is modulated so as to counteract the blurring effect which occurs when a video amplitude transition causes an increase in beam current and a corresponding increase in the size of the electron beam spot at the screen of the cathode ray tube. When such a transition occurs, the beam is deflected in the direction of normal scan at a rate which corresponds to the rate of change in the size of the diameter of the spot so as to substantially arrest the spot edge, thereby causing a displayed video transition to have a better defined vertical edge. Horizontal edges of images are sharpened by auxiliary vertical deflection of the electron beam. Image edges are further improved by a video peaking scheme which eliminates the large spot size growth usually associated with large amplitude video transitions which have been peaked. -1-

235801

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