Random noise, also known as background noise, is accumulated by a large number of fluctuations generated randomly in time, and its value cannot be predicted at a given moment. To tell you the truth, I don't quite understand. Later, random impulse noise was found in the teacher's ppt courseware, and it felt that its effect was similar to salt and pepper noise.

The number of noises can be controlled to generate black and white noises randomly, but black and white noises are also random color values (a, b, c)(255-a, 255-b, 255-c), where a, b and c are random numbers from 0 to 30, and these noises are randomly distributed in image coordinates.