Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-05-20
1983-03-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
G01J 136
Patent
active
043777422
ABSTRACT:
Disclosed is an image sharpness detecting system in which an image formed by an image forming optical system is received by an array of a plurality of optical-electronic transducer elements, and an illumination difference in each individual minute compartment of the above-described image is detected on the basis of the concurrently obtained output signal from a corresponding one of the optical-electronic transducer elements, while all the illumination differences are summed up over the entire area of a sensing region of the above-described image, whereby is obtained a signal representing the degree of sharpness of the image on the above-described array of optical-electronic transducer elements. In this system, the signal representative of the illumination difference in each individual minute compartment of the above-described image is at least non-linearly transformed by utilizing the non-linear characteristics for output versus input of a semiconductor element such as a transistor, and the signal representative of the degree of sharpness of the above-described image is obtained on the basis of the non-linearly transformed signal.
REFERENCES:
patent: 3944816 (1976-03-01), Harada
patent: 4176928 (1979-12-01), Nakamura et al.
patent: 4203031 (1980-05-01), Kamachi et al.
patent: 4223988 (1980-09-01), Jyojiki et al.
Hosoe Kazuya
Kawabata Takashi
Kinoshita Takao
Sakai Shinji
Shinoda Nobuhiko
Canon Kabushiki Kaisha
Nelms David C.
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