Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1988-02-16
1989-12-12
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Focus or magnification control
354402, 355 45, G03B 2752, G03B 300, G03B 1318
Patent
active
048871257
ABSTRACT:
A system for detecting focusing conditions of an image incident upon an image sensor. According to a first aspect of this invention, the system is characterized by the signal processing sequence of (a) reading out projected image information incident on the image sensor within the accumulation time period to put out time series output signals for a reading-out period, (b) filtering the time series output signals to obtain high frequency wave component, (c) subjecting the high frequency wave components to half-wave rectification, (d) integrating the half-wave rectified signals after a predetermined delay from the time when the effective signals begin to be put out and (e) utilizing the thus obtained integrated value as a contrast signal. According to a second aspect, the system is characterized by the (c') subjecting the high frequency wave components to rectification and (d') integrating the rectified signals for a pre-set time duration within the reading-out period. A further modified system is characterized by the processing sequence of (a") projected image information incident on the image sensor within the accumulation time period to put out time series output signals for a reading-out period, (b") filtering the time series output signals to obtain high frequency wave components, (c") subjecting the high frequency wave components to rectification and (d") integrating the rectified signals for a pre-set time duration so that the initial and final portions of the effective output signals corresponding to the effective picture element are cut away.
REFERENCES:
patent: 3896304 (1975-07-01), Aoki et al.
patent: 4411505 (1983-10-01), Sakai et al.
patent: 4470676 (1984-09-01), Kinoshita et al.
patent: 4560864 (1985-12-01), Kinoshita et al.
Fuji Photo Film Co. , Ltd.
Wintercorn Richard A.
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