| 摘要 |
A projector assembly and projection method for determining the amount of keystone distortion present in projection system and automatically correcting said distortion. The projection assembly includes an image correction engine, a light engine, projection lens having a projection axis, a processor, a directional sensor and an inclination sensor. The sensors determine the absolute vertical and horizontal direction of the projection axis and the processor calculates the vertical and horizontal difference angle by calculating the difference between the absolute vertical and horizontal directions and the vertical and horizontal zero references. The vertical zero reference is determined by the inclination sensor. The horizontal zero reference can be either input by the user or measured using an external directional device adapted to be positioned against the projection surface, and having a direction sensor for measuring the zero horizontal reference, such that this measurement can be transmitted to the projector assembly. Based on these the vertical and horizontal difference angles, the processor calculates the keystone distortion and instructs the image correction engine to apply geometric and brightness correction to the image data proportional and inverse to said keystone distortion and effects of lens parameters (field of view, distortion, etc) such that the projected image is free from keystone distortion.
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