Patent ID: 11972548
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 3:
4. The computer-implemented method of claim 3, wherein a respective one of the plurality of feature vectors is expressed as:

F=[ρ,a,Ox,Oy,θ,L,W,r]T;

wherein, ρ
   =
   
    N
    a
   
  
  ,
 

 N stands tor a number of defect points in the respective one of the plurality of mask areas, a stands for an area of the respective one of the plurality of mask areas;, O
      x
     
     =
     
      
       m
       10
      
      a
     
    
    ;
   
   ⁢
   

   	
   
    
     
      O
      y
     
     =
     
      
       m
       01
      
      a
     
    
    ;
   
   ⁢
   

   	
   
    
     θ
     =
     
      
       -
       0.5
      
      ⁢
      atc
      ⁢
      
       tan
       ⁡
       (
       
        
         2
         ⁢
         
          M
          11
         
        
        
         
          M
          02
         
         -
         
          M
          20
         
        
       
       )
      
     
    
    ;
   
   ⁢
   

   	
   
    
     
      M
      ij
     
     =
     
      
       ∑
       
        
         (
         
          x
          ,
          y
         
         )
        
        ∈
        𝒜
       
      
      
       
        
         (
         
          x
          -
          
           O
           x
          
         
         )
        
        i
       
       ⁢
       
        
         (
         
          y
          -
          
           O
           y
          
         
         )
        
        j
       
      
     
    
    ;
   
   ⁢
   

   	
   
    r
    =
    
     
      L
      W
     
     ;;
    
   
  
 

L stands for a length of a minimal external rectangle of the respective one of the plurality of mask areas; and
W stands for a width of a minimal external rectangle of the respective one of the plurality of mask areas.