US 2005/0030487 A1Published application

Projector and projection image correction method thereof

AssigneeCasio Computer Co., Ltd.

InventorHideaki Inoue

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Abstract

A transformation coefficient storing unit has correction tables which are generated based on classification of zooming magnification in a manner of arithmetic progression. An optical mechanism unit supplies information on a zooming magnification Z to a switch control unit of the transformation coefficient storing unit. The switch control unit controls a table selection unit to select any from the correction tables based on the zooming magnification Z. The transformation coefficient storing unit selects a coefficient set from the selected correction table based on inclination angles θH and θV and supplies the selected coefficient set to a trapezoidal correction unit. The trapezoidal correction unit performs trapezoidal correction based on the supplied coefficient set.

Claims5

Dependent claims

A projector for projecting a projection light to a screen surface to form a projection image thereon, comprising:

a projection unit which has a zooming function, and coverts image information of a supplied projection image into information of a projection light and projects the projection light onto the screen surface;
a correction unit which corrects by inverse transformation using transformation coefficients, a projection image on the screen surface which projection image is distorted due to inclinations of an optical axis of the projection light with respect to the screen surface, and supplies information of the corrected projection image to the projection unit;
and
a transformation coefficient supply unit which obtains information regarding a zooming magnification of the projection unit and inclination angles of the optical axis of the projection light with respect to the screen surface, selects the transformation coefficients from preset transformation coefficients based on the obtained zooming magnification and inclination angles, and supplies the selected transformation coefficients to the correction unit.

1 more element

Dependencies are inferred from the claim text.