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You can enable the perspective correction mode by clicking the left mouse button on the video displaying window Surveillance window, for which you want to perform the correction. The presence of the perspective indicator next to the frame of the selected video image means that the mode is enabled.

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1. enable the perspective correction mode;
2. point the mouse cursor to a corner of active image. The cursor will look like a hand with an index finger up;
3. click the left mouse button and, holding it down, move the image corner to the required area of video displaying the Surveillance window;
4. release the left mouse button.