Focus detection by accumulation of a given number of the largest

Details Focus detection by accumulation of a given number of the largest Focus detection by accumulation of a given number of the largest

1979-10-23

1982-02-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G03B 310

Patent

active

043141510

ABSTRACT:
A focus detection system is provided in which an image of an object is projected onto an array comprising a plurality of light acceptor elements, formed by photoelectric elements, to cause them to produce photoelectric signals in accordance with the distribution of light intensity of the image. The photoelectric signals are converted into digital equivalents, and an absolute magnitude of a difference between digital signals of adjacent elements is calculated. These absolute magnitudes are arranged in the sequence of their magnitude, and a given number of them is accumulated, starting from the largest one. The accumulated value is utilized as the value of an evaluation function which indicates the sharpness of the image.

REFERENCES:
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4133606 (1979-01-01), Hosoe et al.
patent: 4180309 (1979-12-01), Miyata et al.
patent: 4265520 (1981-05-01), Tokutomi et al.

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