1. Technical Field
Embodiments of the present invention relate to a projector and a keystone distortion correction method for a projector.
2. Related Art
In a projector, the tilt of the chassis in the installation condition causes a keystone distortion in the projected image. Although such a keystone distortion has been corrected by the user with button operations, automated correction methods have gradually been adopted in recent years.
For example, there has been known a method of installing a range sensor for measuring the distance between the projector and the screen in the projector, detecting the tilt angle of the projector with respect to the screen based on an output of the range sensor, and correcting the keystone distortion in accordance with the tilt angle (see, e.g., JP-A-2000-122617).
Further, there has also been known a method of providing an acceleration sensor inside the projector to detect the tilt of the projector, and thus performing the keystone distortion correction of the projection image (see, e.g., JP-A-2003-283963).
However, according to these methods, an expensive component such as a range sensor or an acceleration sensor needs to be incorporated therein, and a problem of increase in cost arises. Therefore, particularly in projectors, it is difficult for low price popularization models to incorporate it from a viewpoint of cost, and accordingly, a problem arises that the automated keystone distortion correction function (auto keystone function) can hardly be implemented in popularization models.