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US 6,333,761 B2Granted
Image pickup apparatus having focus detection area size dependent on aspect ratio
AssigneeCanon Kabushiki Kaisha
InventorHitoshi Yasuda
Life of this patent
Estimating the term…
Abstract
An image pickup apparatus is arranged to vary the size of a focus detecting area and/or a light measuring area when the aspect ratio of an image plane is changed, so as to optimize the focus detecting area and/or the light measuring area with respect to the image plane.
Claims16
An image pickup apparatus comprising:
- focus adjustment means;
- driving means for driving said focus adjustment means;
- image pickup means for converting an object image formed through said focus adjustment means into a video signal;
- extraction means for extracting from a predetermined area of the video signal a sharpness signal corresponding to a degree of focusing of said focus adjustment means;
- control means for performing focus adjustment by controlling said driving means on the basis of the sharpness signal extracted by said extraction means;
- aspect ratio varying means for varying an aspect ratio of a picked-up image;
- area varying means for varying the predetermined area when the aspect ratio of the picked-up image is varied by said aspect ratio varying means, said area varying means varying a dimension of said predetermined area reverse to the varying of a magnification of said picked-up image as a result of varying the aspect ratio of said picked-up image by said aspect ratio varying means.
4 more elements
An image pickup apparatus comprising:
- image pickup means for converting an object image into a video signal;
- extraction means for extracting from a predetermined area of the video signal a signal corresponding to a degree of focusing of said object image;
- control means for performing focus adjustment on the basis of the signal extracted by said extraction means;
- aspect ratio varying means for varying an aspect ratio of a picked-up image;
- and
- area varying means for varying the predetermined area when the aspect ratio of the picked-up image is varied by said aspect ratio varying means, said area varying means varying a dimension of said predetermined area reverse to the varying of a magnification of said picked-up image as a result of varying the aspect ratio of said picked-up image by said aspect ratio varying means.
3 more elements
An image pickup apparatus comprising:
- (A) an aspect ratio varying device which varies an aspect ratio of a picked-up image,
- (B) a focus adjustment device which performs focus adjustment for an object within a predetermined area of focus adjustment,
- wherein said focus adjustment device varies the predetermined area of focus adjustment according to the variation of the aspect ratio by said aspect ratio varying device, said focus adjustment device varying a dimension of said predetermined area reverse to the varying of a magnification of said picked-up image as a result of varying the aspect ratio of said picked-up image by said aspect ratio varying device.
Dependencies are inferred from the claim text.