A method and device for realizing keystone distortion correction of projection surface and projector

Abstract

The invention discloses a method and device for realizing the correction of trapezoidal distortion of a projection surface, and a projector, including measuring the variation trend of the distance from the projection surface by using a rotatable rangefinder, and determining the correction angle according to the variation trend; according to the determined correction The included angle corrects for keystone distortion. Through the method of the invention, the trapezoidal distortion correction is realized automatically and accurately.

Description

technical field [0001] The invention relates to projector technology, in particular to a projector-based method and device for realizing trapezoidal distortion correction of a projection surface and a projector. Background technique [0002] When the projector is placed and installed, it is difficult to be perpendicular to the projection screen and face the center point of the projection screen. At this time, the diffusion of light projected from the side of the projector that is closer to the projection screen will be smaller than that of the far side, so the projected image will have different widths on both sides, so that the rectangular (square) image becomes trapezoidal. In order to solve keystone image distortion, keystone correction is usually 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 will inevitably decline. [0003] For t...

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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