Patent ID: 11908240
Assignee: INSTITUTE OF AUTOMATION, CHINESE ACADEMY OF SCIENCES
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 1:
2. The method according to claim 1, wherein the step S2 includes steps of:
S21, performing face detection on the collection of micro-expression image frame sequence samples, and cropping out rectangular face images to be zoomed in or out so as to obtain a face image sequence; and
S22: performing gray-scale normalization processing on the face image sequence according to a formula,, N
   ⁡
   (
   
    i
    ,
    j
   
   )
  
  =
  
   
    
     I
     ⁡
     (
     
      i
      ,
      j
     
     )
    
    -
    min
   
   
    max
    -
    min
   
  
 

wherein I(i,j) and N(i,j) respectively represent a gray value of an original image of the face image sequence and a gray value of the image undergoing the gray normalization of the face image sequence, and max and min respectively represent maximum and minimum gray values of the original image of the face image sequence.