Method and apparatus for improving the sharpness of a video pict

Details Method and apparatus for improving the sharpness of a video pict Method and apparatus for improving the sharpness of a video pict

1977-11-28

1982-03-30

Psitos, Aristotelis M.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358242, H04N 920, H04N 568

Patent

active

043227422

ABSTRACT:
A method and apparatus for improving the sharpness of a video picture displayed on the screen of a cathode ray tube. At least one electron beam scans the screen in line-scanning and vertical directions, respectively, the electron beam having its intensity modulated in accordance with a video signal. The scanning velocity of the electron beam is modulated in the line-scanning direction in accordance with transitions of the video signal which correspond to transitions between high and low brightness levels of the displayed video picture. Each electron beam is shaped to have a substantially oval shape whose longer axis is disposed in the line-scanning direction and whose shorter axis is disposed in the vertical direction, whereby the oval-shaped beam impinges upon the display screen and the sharpness of the displayed video picture in the vertical direction is improved.

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patent: 3980819 (1976-09-01), Schwartz
patent: 4057747 (1977-11-01), Hamano
patent: 4080628 (1978-03-01), Jirka

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