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There are usually two methods for trapezoidal correction: optical trapezoidal correction and digital trapezoidal correction. Optical trapezoidal correction refers to the purpose of adjusting the trapezoid by adjusting the physical position of the lens. Another type of trapezoidal correction is to implement trapezoidal correction by software.

At present, almost all projector manufacturers have adopted digital trapezoidal correction technology, and most projectors that use digital trapezoidal correction support the vertical trapezoidal correction function, that is, the projector can adjust its height in the vertical direction, resulting in trapezoidal The vertical trapezoidal correction by the projector makes the picture rectangular, which facilitates the user's use.

However, in practical applications, in addition to the need for vertical trapezoidal correction, trapezoids often occur due to the offset of the horizontal position of the projector. Many projector manufacturers have developed a "horizontal trapezoidal correction function." Both the horizontal trapezoidal correction and the vertical trapezoidal correction are digital trapezoidal corrections, and the shapes are adjusted and compensated by the software interpolation algorithm. Horizontal trapezoidal correction solves horizontal trapezoidal distortion caused by the fact that the projector mirror cannot be perpendicular to the screen, so that the projector can also implement a standard rectangular projection image on the side of the screen.

Digital trapezoidal correction can solve the trapezoidal distortion problem when the image accuracy is not high, and it is very practical, but it is not suitable for those applications that require high image accuracy. Because, after the image is corrected, burrs and unsmoothness may appear on some lines and character edges of the picture, resulting in poor resolution.