I-View DM-5MIPN 5-Megapixels Vandal Proof Dome IP Camera - Manual (Page 46)

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Video system: Choice the video system for the TV out (Composite signal). .
The maximum frame rate will be 30 fps when choice the NTSC mode and 25fps at the PAL
mode.
ROI:
ROI (Region of Interest) encoding is used to enhance the quality of images which are
specified in advance. These ROI areas image will first priority to send out for internet
transmission when bandwidth is not enough.
The ROI mode is not effect when enable the VBR mode.