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PTZ vs SetZoom?
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AlanZ  
#1 Posted : Friday, February 15, 2019 7:10:12 AM(UTC)
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Let's assume I have a 4K camera and want to get some HD areas of interest.

Is there any difference in the end result quality if I use SetZoom via a shortcut versus changing the magnification of the original input via PTZ?
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AlanZ  
#2 Posted : Saturday, February 16, 2019 6:48:51 AM(UTC)
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Any thoughts?
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Barney Box Lane  
#3 Posted : Sunday, February 17, 2019 3:46:07 AM(UTC)
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yeah when you zoom in with the 4k cam it's still full 4k because it uses the lense - this is called optical zoom but double check your camera uses optical zoom to zoom.
Then you can zoom in on the shot which is digital zoom, where you're cropped in to part of that 4k shot to a hd level.

If your project is hd output it will remain hd whether you're zoomed in or out.. if the project output is 4k you would be loosing pixels/quality when you digitally zoom
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AlanZ  
#4 Posted : Sunday, February 17, 2019 11:34:44 AM(UTC)
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Barney, thanks but that does not answer my question.
The question was to find if there is a quality difference between SetZoom and Zooming via the virtual PTZ function.
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AlanZ  
#5 Posted : Sunday, February 17, 2019 11:37:20 AM(UTC)
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Only one of my 4K cameras has optical zoom... it is a Sony AX33. My other two are a Logitech Brio, and a Sony FDR-x1000v action camera.
My question is particularly relevant to the latter two camera.
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richardgatarski  
#6 Posted : Monday, February 18, 2019 7:34:19 AM(UTC)
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Alan, I don't see any reason why the quality should differ between a shortcut zoom and a Virtual PTZ ditto.

I mean, zoom levels in Virtual Sets vs shortcut zooms - same, same.

Why don't you just test and see?
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mjgraves  
#7 Posted : Monday, February 18, 2019 1:30:05 PM(UTC)
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You can zoom in on a 4K source to 3x and still be delivering pixel-perfect 720p. Zoom in further and you start to degrade the output image.
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Barney Box Lane  
#8 Posted : Monday, February 18, 2019 8:41:16 PM(UTC)
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'is there a difference between setzoom and virtual ptz zoom'

no
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