Vertical keystone correction.

垂直梯形校正。

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A new method which using two order keystone transform to correct quadratic migration and frequency domain correction to correct once migration was proposed.

提出了一种新的解决方法，即利用二阶keystone变换补偿时间二次项，然后用频域校正算法补偿时间一次项。

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Furthermore, the projector offers an auto V-Keystone Correction button to automatically activate in response to the installation angle of the projector.

ENGADGET: Sharp shows off the XV-Z15000 1080p projector

To maintain an accurate image, the XV-Z15000 includes Keystone Correction, which corrects spherical, cylindrical and trapezoidal distortion of an image on a flat screen.

ENGADGET: Sharp shows off the XV-Z15000 1080p projector

It is also equipped with Easy-Slide image correction, an intuitive horizontal keystone adjustment slide control bar allowing users to place the projector off-center from the screen and easily center the image with the touch of a finger.

ENGADGET: Epson adds the Home Cinema 750HD to its line of home theater projectors, ships in March for $899