Method and system for judging pain according to expressions

The invention discloses a method and system for judging pain according to expressions. The method comprises the steps: acquiring multiple reference expression images of a to-be-judged user face area are acquired; obtaining a plurality of to-be-judged expression images of a to-be-judged user face area; and inputting the reference expression image and the expression image to be judged into the painjudgment model to obtain a pain judgment result. By inputting the reference expression image and the expression image to be judged into the pain judgment model, a pain judgment result is obtained, andthe influence of expression difference can be reduced. By adding the time dimension information of the reference expression image and the expression image to be judged, the pain judgment result is obtained on the basis of the consistency of facial expression changes and the time sequence of the expression changes, the accuracy can be improved, and the influence of individual difference is reduced. Meanwhile, by obtaining