Method and device for realizing trapezoidal distortion correction of projection surface and projector

Abstract

The invention discloses a method and a device for realizing trapezoidal distortion correction of a projection surface and a projector. The method comprises the following steps: measuring the variation trend of the distance to the projection surface by a rotatable distance measuring instrument; determining a correction intersection angle according to the variation trend; and correcting the trapezoidal distortion according to the determined correction intersection angle. Through the method disclosed by the invention, trapezoidal distortion correction is automatically and accurately realized.

Description

Technical field [0001] The invention relates to projector technology, in particular to a projector-based method and device for realizing keystone distortion correction of a projection surface, and a projector. Background technique [0002] When the projector is installed, it is difficult to be perpendicular to the projection screen and directly facing the center point of the projection screen. At this time, the spread of light from the side of the projector that is closer to the projection screen will be less than the spread of the far side. Therefore, the projected image will have different widths on both sides, so that the rectangular (square) image becomes The trapezoid. In order to solve the keystone image distortion, usually keystone correction is used. Keystone correction is the shape adjustment and compensation of the image before projection by the electronic device through the difference algorithm, but the actual image quality is inevitably reduced. [0003] Digital keys...

AI Technical Summary

Problems solved by technology

Because, in the current automatic vertical keystone correction technology, when the angle between the projector and the horizontal plane exceeds 45°, it is impossible to identify whether the projection surface is a wall or a ceiling. If the angle between the projector and the horizontal plane exceeds 45°, the projection surface It is a wall, but at this time, if the projector already thinks that the projection surface is the ceiling, it will cause the projector to correct the keystone distortion when it is less than 45° when projecting to the ceiling, but the angle projected to the wall is greater than 45° at this time. °, therefore, the existing automatic vertical keystone correction cannot perform accurate keystone correction

[0005] Horizontal Keystone Correction Only some manufacturers have introduced the manual horizontal keystone correction function. The principle is the same as the vertical keystone correction, but the automatic horizontal keystone correction function has not been implemented, that is, the angle between the projector and the wall on the horizontal plane cannot be known.

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