Patent ID: 7150536

Claim:
A projector comprising: a projection unit which has a zooming function and converts image information of a supplied projection image into information of a projection light and projects the projection light onto a screen surface; a correction unit which corrects a projection image on the screen surface by inverse transformation using transformation coefficients , said projection image being 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; wherein the transformation coefficient supply unit comprises: a plurality of transformation coefficient tables, each of which stores transformation coefficients preset based on the inclination angles, in association with one of a plurality of zooming magnifications; a table selection unit which is supplied with a selection signal and selects a transformation coefficient table from the plurality of transformation coefficient tables in accordance with the supplied selection signal; and a control unit which generates the selection signal based on the obtained information regarding the zooming magnification of the projection unit, and controls the table selection unit by supplying the generated selection signal thereto such that the table selection unit selects the transformation coefficient table associated with the obtained zooming magnification, and the transformation coefficient supply unit selects the transformation coefficients from transformation coefficients stored in the transformation coefficient table selected by the table selection unit based on the obtained inclination angles, and supplies the selected transformation coefficients to the correction unit.