Edimax Technology PT-31W - Manual (Page 37)

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Shaprness
Default
Set all above values to default value ‘128’.
Mirror Check ‘Vertical’ or ‘Horizontal’ box to flip the image vertically or
horizontally, this will help to correct the orientation of image when
IP camera is hanged bottom-up by camera holder.
You can click both ‘Vertical’ and ‘Horizontal’ box at the same time.
Power Line
Frequency
Select the frequency of power line of the place you’re using this IP
camera. This will help to reduce the flicker of certain lights in the
image.
When you finish with above settings, click ‘Apply’ button to save changes.
3-5-2 Video Setting
You can adjust the video transfer parameters in this page.