Automatic focus-adjusting apparatus using two-dimensional freque

Details Automatic focus-adjusting apparatus using two-dimensional freque Automatic focus-adjusting apparatus using two-dimensional freque

1991-01-14

1992-04-14

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358228, 354402, H04N 5232

Patent

active

051052784

ABSTRACT:
An automatic focus-adjusting apparatus has an image pickup device for converting optical information of the image of a photographed object formed on an image pickup face of an image pickup element through a lens to an electric signal; an A/D converter for converting the converted electric signal to a digital signal; a memory for temporarily storing the digital signal every frame; an encoder for performing a two-dimensional orthogonal transformation in a frequency region with respect to an image formed by using the digital signals and detecting a magnitude of each of frequency components provided from this image; a focus detector for detecting the amplitude of a high frequency component specified from the respective frequency components; and a lens moving device for adjusting a position of the lens by a control signal transmitted from the focus detector. A focusing position of the lens is provided by adjusting the position thereof such that the amplitude of the specified high frequency component is maximum.

REFERENCES:
patent: 4541012 (1985-09-01), Tescher
patent: 4975726 (1990-12-01), Kuga et al.
Article by: Chen et al.; "Scene Adaptive Coder", IEEE, Transactions on Communications, vol. COM-32, No. 3, Mar. 1984.

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