Focus detecting device

Details Focus detecting device Focus detecting device

1985-12-18

1988-01-26

Gellner, Michael L.

G03B 310

Patent

active

047219750

ABSTRACT:
A focus detecting device is provided in which at least a line sensor having a plurality of picture elements is used for receiving light having passed through an objective lens to produce image data. The image data is compared with data shifting the image data by a unit of one or more picture elements to calculate the difference therebetween. It is then determined whether this difference exceeds a predetermined range. Various alternative scheme of calculations on the image data, delayed image data, and differences thereof are disclosed and are responsive to an indication of whether the predetermined condition is exceeded, for identifying defocus of the objective lens. These schemes include one in which, when the difference exceeds the predetermined range, the difference data are reduced by a predetermined rate for calculating defocus of the objective lens.

REFERENCES:
patent: 3875401 (1975-04-01), Stauffer
patent: 4329033 (1982-05-01), Masunaga et al.

Affiliated with

Also associated with

Rating

Focus detecting device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Focus detecting device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detecting device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1470620