ViTiny UM20-GN08 User Manual page 17

1.4.4 NR
Noise Reduction：(NR) To obtain high quality output image and
increase file compression. See below:
(1) 2D NR：LOW/MIDDLE/HIGH, Edge Preserving 2D NR.
(2) 3D NR LOW/MIDDLE/HIGH, Motion Adaptive 3D NR.
(3) Return :Return to last page or Save & End Menu.
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