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US 5,204,749 AGranted
Automatic follow-up focus detecting device and automatic follow-up device
AssigneeCanon Kabushiki Kaisha
InventorsMasamichi Toyama, Youichi Iwasaki, Akihiro Fujiwara, Takashi Amikura, Naoya Kaneda, Masahiro Takei
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Abstract
An automatic follow-up focus detecting device comprises means for shiftably setting a follow-up field; extracting means for extracting a feature of an object in relation to the follow-up field; storing means for storing the extracted feature; detecting means for detecting a relative shift between the object and the device on the basis of the feature of the object extracted by the extracting means and the feature stored by the storing means; and shifting means for shifting a distance measuring field following the object according to the relative shift.
Claims16
An automatic follow-up focus detecting device comprising:
- means for shiftably setting a follow-up field;
- extracting means for extracting a feature of an object in relation to the follow-up field;
- storing means for storing said extracted feature;
- detecting means for detecting a relative shift between said object and the device on the basis of the feature of said object newly extracted by said extracting means and the feature stored by said storing means;
- and
- shifting means for shifting a distance measuring field following said object according to said relative shift between said object and the device.
3 more elements
A video camera, comprising:
- (A) a photographing optical system for photographing an object and for focusing an image of the object on an image sensing plane;
- (B) image sensing means for converting the image of the object on said image sensing plane into an image sensing signal;
- (C) area setting means for setting a detecting area for extracting a feature of said image of the object on said image sensing plane;
- (D) detecting means for detecting the feature of said image from said image sensing signal corresponding to said detecting area, and for putting out corresponding signals;
- (E) first control means for detecting a variation of said image of the object on the basis of an output of said detecting means and for controlling said area setting means so that said detecting area follows the variation of said image of the object;
- and
- (F) second control means for varying a size of said detecting area in response to a focal length of said photographing optical system.
4 more elements
A video camera, comprising:
- (A) a photographing optical system for photographing an object and for focusing an image of the object on an image sensing plane;
- (B) image sensing means for converting the image of the object on said image sensing plane into an image sensing signal;
- (C) area setting means for setting a detecting area for extracting a feature of said image of the object on said image sensing plane;
- (D) detecting means for detecting the feature of said image from said image sensing signal corresponding to said detecting area, and for producing outputs;
- (E) first control means for detecting a variation of said image of the object on the basis of an output of said detecting means and for controlling said area setting means so that said detecting area follows the variation of said image of the object;
- and
- (F) second control means for varying a size of said detecting area in response to a distance between said object and the video camera body.
4 more elements
A video camera, comprising:
- (A) image sensing means for converting the image of the object on said image sensing plane into an image sensing signal;
- (B) area setting means for setting a detecting area for extracting a feature of said image of the object on said image sensing plane;
- (C) detecting means for detecting the feature of said image from said image sensing signal corresponding to said detecting area, and for producing an output;
- (D) control means for detecting a variation of said image of the object on the basis of an output of said detecting means and for controlling said area setting means so that said detecting area follows the variation of said image of the object;
- and
- (E) adjusting means for manually varying a size of said detecting area.
3 more elements
A video camera, comprising:
- (A) area setting means for setting a detecting area for detecting a feature of an image in a picture plane;
- (B) detecting means for detecting the feature of said image in said detecting area from the image signal;
- (C) control means for detecting a variation of said image on the basis of an output of said detecting means and for controlling said area setting means so that said detecting area follows the variation of said image when the variation of said image comes beyond a predetermined threshold value;
- and
- (D) means for varying said threshold value.
2 more elements
Dependencies are inferred from the claim text.