Television – Camera – system and detail – Camera image stabilization
Reexamination Certificate
1997-10-01
2001-11-20
Garber, Wendy R. (Department: 2612)
Television
Camera, system and detail
Camera image stabilization
C348S347000, C348S351000, C348S357000, C348S360000, C348S363000, C348S374000, C396S054000, C396S055000
Reexamination Certificate
active
06320613
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus used to prevent an image blur in a camera, optical equipment, or the like.
2. Related Background Art
Conventionally, in an image blur prevention system used in a camera, not only a hand vibration but also a vibration (image blur) of a camera body caused by a shock of a mechanical member such as a mirror, a shutter, or the like must be suppressed to some extent. For this purpose, the frequency band of image blur prevention performance itself is extended toward the high-frequency side.
However, in the conventional method, as the frequency band is extended to the high-frequency side, the calculation speed in a CPU, the sampling speed of input data, and the transfer rate or transfer interval of output data must fulfill high-speed requirements. In particular, when the CPU simultaneously executes another sequence control for the camera, the load on the CPU itself undesirably becomes very heavy.
SUMMARY OF THE INVENTION
One aspect of the invention is to provide an apparatus used for image blur prevention, comprising:
a variable portion for changing a sampling period for sampling a signal used for image blur prevention.
With this arrangement, when high image blur prevention precision is required, image blur prevention is attained with high precision.
Another aspect of the invention is to provide an apparatus used for image blur prevention, comprising:
a variable portion for changing a signal input period of a signal which is input to a calculation circuit for performing a calculation for image blur prevention and is used for the calculation.
With this arrangement, the calculation circuit can perform a calculation for image blur prevention which satisfies the required precision of image blur prevention, the load on the calculation circuit, and the like.
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Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Garber Wendy R.
Vu Ngoc-Yen
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