There are a lot of small noises in a photo during storage. Which operation is the best for noise reduction?

Histogram equalization can enhance the visual effect of the image. This technique can automatically calculate the transformation function without artificially setting parameters. The operation is simple and suitable for all situations.

In a 8-bit RGB color image, what color does (255, 255, 255) represent?

Modifying the H component of the HSV color space will change the image? (Single choice)

Using binary digital segmentation, because of noise, the connected domains of all characters are glued together. What method can be used to segment characters?