Multi-person facial expression recognition system and method based on deep learning

The invention discloses a multi-person facial expression recognition system and method based on deep learning, relates to the field of image recognition, solves the problem that an existing facial expression recognition mode is long in preparation period, and comprises a facial calibration module, a facial classification module, a facial expression module, a judgment coefficient module and an expression recognition module. The face calibration module obtains calibration image data, the face classification module obtains face classification data according to the calibration image data, the face expression module obtains expression index data according to the calibration image data, and the judgment coefficient module obtains expression judgment data according to the expression index data. According to the method, the face height value and the face width value are obtained, the face aspect ratio value is calculated, the face aspect ratio value is subjected to threshold division, the face fat and thin grading da