Keystone correction is a useful technology in scenarios where the camera can not be mounted directly in front of the ROI (region of interest) of the scene. This tool allows user to define the keystone effect by eight parameters: Actual Angle, Actual Distance, Actual FOV, Virtual Angle, Virtual Distance, Virtual FOV, Virtual Shift and Virtual Aspect.
On the Perspective Correction page, the keystone effect is illustrated in Actual and Virtual Camera Position graph; both actual camera position (blue) and virtual camera position (green) are adjustable by moving sliders or entering desired values in the edit boxes. X perspective gain and Y perspective curves are plotted on the right part of this page in blue. Polynomial fitting results are plotted as red dotted curves.
Fig. 8 Perspective Correction Page

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