How to adjust the aperture brightness and change the darkness of photos according to environmental changes?

Let's take a look at the surrounding environment with the camera first.

Aperture is a photographic term, which is used to control the amount of light entering the photosensitive surface of the fuselage through the lens. It is usually set in the lens. Usually we use the value of f to indicate the aperture size. Generally speaking, it is impossible to change the lens diameter at will when a camera lens takes pictures, but the luminous flux can be controlled by adding a polygonal or circular variable aperture grating inside the lens. This device is called an aperture.