MicroLinks UM06 - user guide - Manual (Page 9)

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(8) Video Ratio ：Changes the image ratio or Field of View. The original image
size is a 5M image (2592*1944) output.
(8-1) 4/3F：Formats the image to fit a 4:3 screen size (1440*1080) by
proportionally reducing the input image to fit the screen.
(8-2) 16/9S：Formats the image to fit a 16:9 screen size (1920*1080) by
scaling the input image width and trimming the height to fit the screen.
The magnification will also increase.
(8-3) 16/9C：Formats the image to fit a 16:9 screen size (1920*1080) by
cropping the input image (1920*1080) from input image 5M