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What does the trapezoidal correction of projector mean? Does it affect the image quality?

  • 2022-04-21
1、 What is trapezoidal correction

In the daily use of the projector, the position of the projector should be at right angles to the projection screen as far as possible to ensure the squareness of the projection picture. If the perpendicularity of the two cannot be guaranteed, the picture will be trapezoidal. At this time, it is necessary to correct the picture to ensure that the picture becomes a standard rectangle, which is trapezoidal correction.



2、 Trapezoidal correction principle
First of all, we need to know that there are usually two methods of trapezoidal correction: optical trapezoidal correction and digital trapezoidal correction.
Optical trapezoid correction: it refers to the purpose of adjusting the trapezoid by adjusting the physical position of the lens. It is also called axis shifting, which is the same as the axis shifting lens of the camera.
Digital trapezoidal correction: the principle is that for the trapezoidal distortion to be generated by the projector projection light path, the original image is geometrically transformed by the interpolation algorithm to generate a reverse compensation trapezoidal image to compensate for the image trapezoidal distortion generated by the projection light path, so that the projected image presents a regular rectangle.

3、 Does trapezoidal correction affect image quality
The image quality after optical trapezoid correction basically has no change; The digital trapezoidal correction will compress the picture, which may lead to the decline of picture quality. After the image is corrected, some lines and character edges of the picture will appear burr and unsmooth, resulting in the reduction of picture clarity. When the requirements for image accuracy are not high, digital trapezoidal correction can well solve the problem of trapezoidal distortion, which is very practical, but it is not suitable for use when the requirements for image accuracy are high. Therefore, when using the projector, we should try our best to ensure that the projector is facing the projection screen, so as to enjoy the best image quality.

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