Patent ID: 11967115
Assignee: WUHAN TEXTILE UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G  A  Y | IPC A  G

Claim 4:
5. The color matching evaluation method combining the similarity measure and the visual perception according to claim 1, wherein calculation formulas of the structural similarity in Step 6 are as follows:, l
       ⁡
       (
       
        x
        ,
        y
       
       )
      
      =
      
       
        
         2
         ⁢
         
          μ
          x
         
         ⁢
         
          μ
          y
         
        
        +
        
         c
         1
        
       
       
        
         μ
         x
         2
        
        +
        
         μ
         y
         2
        
        +
        
         c
         1
        
       
      
     
     ;
    
   
   
    
     Formula
     ⁢
        
     XIII
    
   
  
 

 
  
   
    
     
      
       c
       ⁡
       (
       
        x
        ,
        y
       
       )
      
      =
      
       
        
         2
         ⁢
         
          σ
          x
         
         ⁢
         
          σ
          y
         
        
        +
        
         c
         2
        
       
       
        
         σ
         x
         2
        
        +
        
         σ
         y
         2
        
        +
        
         c
         2
        
       
      
     
     ;
    
   
   
    
     Formula
     ⁢
        
     XIV
    
   
  
 

 
  
   
    
     
      
       s
       ⁡
       (
       
        x
        ,
        y
       
       )
      
      =
      
       
        
         σ
         
          x
          ⁢
          γ
         
        
        +
        
         c
         3
        
       
       
        
         
          σ
          x
         
         ⁢
         
          σ
          y
         
        
        +
        
         c
         3
        
       
      
     
     ;
    
   
   
    
     Formula
     ⁢
        
     XV
    
   
  
 

 
  
   
    
     
      
       
        
         S
         ⁢
         S
         ⁢
         I
         ⁢
         M
        
        =
        
         
          
           l
           ⁡
           (
           
            x
            ,
            y
           
           )
          
          α
         
         ×
         
          
           c
           ⁡
           (
           
            x
            ,
            y
           
           )
          
          β
         
         ×
         
          s
          ⁡
          (
          
           x
           ,
           y
          
          )
         
        
       
       )
      
      γ
     
     ;
    
   
   
    
     Formula
     ⁢
        
     XVI
    
   
  
 

wherein x and y respectively represent two images needing to be compared; l(x, y), c(x, y), and s(x, y) represent brightness comparison, contrast comparison, and structure comparison; μx, μy, σx, σy, and σxy respectively represent a mean value of x, a mean value of y, a standard deviation of x, a standard deviation of y, and a covariance between x and y; c1, c2, and c3 are constants, respectively, to avoid an error where the denominator is 0, c3=c2/2; and in actual calculation, α, β, and γ are all set to be 1.