Note 9 has the same cameras as the S9 Plus, which includes a nifty dual-aperture that can open or close to change the amount of light the camera gets. Samsung is the only smartphone maker today to offer a dual aperture. To differentiate itself from its Galaxy brethren, Note 9 uses photo software to identify and optimize pictures from 20 different subject categories, including flowers, sky, pets, food, and people. This is similar to what's found on the Huawei P20 Pro and the LG V35 Think
For example, when you're taking a photo of a flower, the camera will recognize the object and a tiny flower icon appears on the bottom of the screen. The phone then adjusts its settings to make the flower look as good as possible when you take a photo. The results are good though a bit confounding. The scene optimizations are not over-the-top like Instagram filters, which I think is a good thing because they look less obvious. But sometimes there a is very little difference between the photographs when scene optimization is on or off. I recommend giving it a try.