Q-See Computer Hardware - Manual (Page 57)

SuperDVR & H.264 Series Cards
User Manual
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6.3.4 Image Zoom in/out
When in single channel playback mode, the zoom control icons
will appear. Select and click on the channel, it will zoom out the image.
By clicking continuously, the image will be zoomed out continuously. Select
and do the some operation to get the opposite effect. Click and
recover the original size. Take the following three pictures for example.
Figure6-17 Example: original size
Figure6-18 Example: zoomed out