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Image movement correction of camera

  • US 5,794,078 A
  • Filed: 09/06/1996
  • Issued: 08/11/1998
  • Est. Priority Date: 09/11/1995
  • Status: Expired due to Term
First Claim
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1. An image correcting camera comprising:

  • an acceleration detecting unit to detect accelerations in X-, Y- and Z-axis directions orthogonal to each other, which accelerations act upon said camera;

    an angular velocity detecting unit to detect angular velocities about the tri-axes that act upon said camera;

    an attitude calculating unit to calculate a coordinate transform matrix between a camera coordinate system and a static coordinate system from an initial attitude of said camera with respect to the static coordinate system and from the angular velocities about the tri-axes;

    a gravitational acceleration component calculating unit to calculate a gravitational acceleration component in the camera coordinate system by use of the coordinate transform matrix;

    a displacement calculating unit to calculate an initial velocity from the acceleration with an elimination of the gravitational acceleration component, to calculate a velocity from the initial velocity and from the acceleration with an elimination of the gravitational acceleration component, and to calculate a displacement from the velocity;

    an object distance measuring unit to measure a distance between said camera and an object;

    a photographing magnification detecting unit to detect a photographing magnification of said camera;

    an image-shake correcting device;

    a correction quantity calculating unit to calculate an image shake quantity on the basis of the displacements in X- and Y-axis directions or in tri-axis directions, angles of rotations about X- and Y-axes or about tri-axes that are calculated from the angular velocities about the X- and Y-axes or about the tri-axes, a distance between said camera and the object, and the photographing magnification, and to determine a drive quantity of said image-shake correcting device on the basis of the image shake quantity; and

    a driving device to drive said image-shake correcting device on the basis of the drive quantity.

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