Auto focus apparatus

Details Auto focus apparatus Auto focus apparatus

1993-05-20

1999-11-09

Garber, Wendy

Television

Camera, system and detail

Optics

348349, 348353, 348354, H04N 5232

Patent

active

059824301

ABSTRACT:
An apparatus for generating an auto-focus measurement value for use in performing an auto-focus operation on the basis of contrast components in a video signal. The apparatus includes a line peak circuit which sequentially receives lines of the video signal and generates therefrom a sequence of maximum values of the contrast components of each of the lines. An averaging circuit calculates a rolling average of the line maximum values to form average values. A peak hold circuit outputs a maximum value of the average values as the auto-focus measurement value. The resulting auto-focus measurement value is not greatly affected either by noise or by moving objects within the image represented by the video signal.

REFERENCES:
patent: 4603355 (1986-07-01), Yamada et al.
patent: 4967279 (1990-10-01), Murashima
patent: 5093716 (1992-03-01), Kondo et al.
patent: 5107337 (1992-04-01), Ueda et al.
patent: 5115262 (1992-05-01), Komiya
patent: 5126849 (1992-06-01), Senuma et al.
patent: 5204749 (1993-04-01), Toyama et al.

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