Image harmonization method and system based on background style migration

The invention belongs to the technical field of image processing, and provides an image harmonization method and system based on background style migration in order to solve the problems of visual inconsistency and foreground semantic information change in existing image harmonization. Splicing the extracted background style features with multi-scale foreground semantic features of a to-be-optimized synthetic image to obtain fusion features; performing normalization operation on the obtained fusion features and the foreground semantic features of the scales corresponding to the fusion features to obtain harmonious foreground features with fixed foreground semantics and changed foreground styles; and splicing the harmonious foreground feature with a background region of a to-be-optimized synthetic image to obtain a harmonious image. On the basis of keeping foreground semantics unchanged, foreground styles are standardized according to background style features, so that the visual consistency of the whole image