Projector with a device for measuring angle of inclination
AssigneeNEC Viewtechnology, Ltd.
InventorKazuo Mochizuki
Life of this patent
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Abstract
A projector includes a projection device, a cross line positional information acquiring device for acquiring positional information of a cross line between a projection surface of the projection device and a plane crossing the projection surface, an inclination detecting device for calculating an angle of inclination between a projection optical axis of the projection device and the projection surface based on the positional information acquired by the cross line positional information acquiring device, and an image distortion correcting device for correcting a trapezoidal distortion of an input image supplied to the projection device, based on the angle of inclination calculated by the inclination detecting device.
Claims20
A projector comprising:
- a projection device;
- a cross line positional information acquiring device for acquiring positional information of a cross line between a projection surface and an adjacent surface crossing the projection surface;
- an inclination detecting device for calculating an angle of inclination between a projection optical axis of the projection device and the projection surface, based on the positional information acquired by the cross line positional information acquiring device;
- and
- an image distortion correcting device for correcting a trapezoidal distortion of an input image supplied to the projection device, based on the angle of inclination calculated by the inclination detecting device.
A projector comprising:
- a projection device;
- a cross line positional information acquiring device for acquiring positional information of a cross line between a projection surface and an adjacent surface crossing the projection surface;
- a vertical angle-of-inclination acquiring device for detecting an angle of inclination of a projection optical axis of the projection device in a vertical plane;
- an inclination detecting device for calculating an angle of inclination between the projection optical axis and the projection surface in a horizontal plane, based on the positional information acquired by the cross line positional information acquiring device;
- and
- an image distortion correcting device for correcting a trapezoidal distortion of an input image supplied to the projection device, based on the angle of inclination in the horizontal plane calculated by the inclination detecting device, and based on the angle of inclination in the vertical plane detected by the vertical angle-of-inclination acquiring device.
A method for correcting a trapezoidal distortion of a projector, comprising:
- acquiring positional information of a cross line between a projection surface and a an adjacent surface crossing the projection surface;
- calculating an angle of inclination between a projection optical axis of the projection device and the projection surface, based an the acquired positional information;
- and
- correcting the trapezoidal distortion of an input image supplied to the projection device, based on the calculated angle of inclination.
A method of correcting a trapezoidal distortion of a projector, comprising:
- acquiring positional information of a cross line between a projection surface and a an adjacent surface crossing the projection surface;
- calculating an angle of inclination in a horizontal plane between a projection optical axis of the projection device and the projection surface, based on the acquired positional information;
- calculating an angle of inclination of the projection optical axis in a vertical plane based on gravitational acceleration;
- and
- correcting the trapezoidal distortion of an input image supplied to the projection device, based on the calculated angles of inclination in the horizontal and vertical planes.
Dependencies are inferred from the claim text.