The image processing method and common processing software in this paper;

Commonly used image formats are bmp, wmf, emf, tif, jpg, etc.

Bmp is a bitmap, which has the advantages of primitive storage, large volume and high quality.

Tif has good compatibility and provides preview. The disadvantage is its large size, but it is the most widely supported graphic file format for papers, books, periodicals and other publications, and the printing clarity is particularly good.

Wmf and emf are a vector graphics format, and pictures or graphic objects stored in Word belong to this format. No matter whether it is enlarged or reduced, the clarity of the graphics remains unchanged, and the required storage space is very small.

Jpg is a commonly used lossy compression scheme, which is used to compress and store a large number of pictures, and can reach 600dpi for scientific research papers.