Auto-focus regulating method for video cameras and device thereo

Details Auto-focus regulating method for video cameras and device thereo Auto-focus regulating method for video cameras and device thereo

1993-09-30

1995-12-19

Razavi, Michael T.

Television

Camera, system and detail

Optics

348349, H04N 5232

Patent

active

054772710

ABSTRACT:
An auto-focus regulating method for a video camera includes the steps of: obtaining slopes between adjacent pixels contained in a sampling area constituting at least part of a frame screen; integrating all slopes of the sampling area: calculating the difference of the integrated values between the previous and following frame screens; and performing a focus control so that the integrated values in the following frame screens are increased by the difference of the integrated values. The auto-focus regulating method for video cameras has an advantage that various focus modes can be provided compared with the conventional method by which the focus is regulated by the sum of envelopes.

REFERENCES:
patent: 4638364 (1987-01-01), Hiramatsu
patent: 4853788 (1989-08-01), Murashima et al.
patent: 5003339 (1991-03-01), Kikuchi et al.

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