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

Claim 3:
4. The color matching evaluation method combining the similarity measure and the visual perception according to claim 1, wherein the color difference model used in Step 4 comprises color difference calculation models CIELab, CIE94, and CIE2000, formulas of which are respectively as shown in Formulas VIII to X,, C
       ⁢
       I
       ⁢
       
        E
        
         l
         ⁢
         a
         ⁢
         b
        
       
      
      =
      
       
        
         
          (
          
           
            L
            2
           
           -
           
            L
            1
           
          
          )
         
         2
        
        +
        
         
          (
          
           
            a
            2
           
           -
           
            a
            1
           
          
          )
         
         2
        
        +
        
         
          (
          
           
            b
            2
           
           -
           
            b
            1
           
          
          )
         
         2
        
       
      
     
     ;
    
   
   
    
     Formula
     ⁢
        
     VIII
    
   
  
 

 
  
   
    
     
      
       C
       ⁢
       I
       ⁢
       E
       ⁢
       94
      
      =
      
       
        
         
          (
          
           
            
              
             Δ
            
            L
           
           
            
             K
             L
            
            ⁢
            
             S
             L
            
           
          
          )
         
         2
        
        +
        
         
          (
          
           
            
              
             Δ
            
            
             C
             
              a
              ⁢
              b
             
            
           
           
            
             K
             c
            
            ⁢
            
             S
             c
            
           
          
          )
         
         2
        
        +
        
         
          (
          
           
            
             Δ
            
            
             H
             
              a
              ⁢
              b
             
            
           
           
            
             K
             H
            
            ⁢
            
             S
             H
            
           
          
          )
         
         2
        
       
      
     
     ;
    
   
   
    
     Formula
     ⁢
        
     IX
    
   
  
 

 
  
   
    
     
      
       C
       ⁢
       I
       ⁢
       E
       ⁢
       D
       ⁢
       E
       ⁢
       2000
      
      =
      
       
        
         
          
           
            
             (
             
              
               
                 
                Δ
               
               L
              
              
               
                K
                L
               
               ⁢
               
                S
                L
               
              
             
             )
            
            2
           
           +
           
            
             (
             
              
               
                 
                Δ
               
               
                C
                
                 a
                 ⁢
                 b
                
               
              
              
               
                K
                c
               
               ⁢
               
                S
                c
               
              
             
             )
            
            2
           
           +
           
            
             (
             
              
               
                Δ
               
               
                H
                
                 a
                 ⁢
                 b
                
               
              
              
               
                K
                H
               
               ⁢
               
                S
                H
               
              
             
             )
            
            2
           
           +
          
         
        
        
         
          
           
            
             R
             r
            
            (
            
             
              
                
               Δ
              
              C
             
             
              
               K
               c
              
              ⁢
              
               S
               c
              
             
            
            )
           
           ⁢
           
            (
            
             
              
               Δ
              
              
               H
               
                a
                ⁢
                b
               
              
             
             
              
               K
               H
              
              ⁢
              
               S
               H
              
             
            
            )
           
          
         
        
       
      
     
     ;
    
   
   
    
     Formula
     ⁢
        
     X
    
   
  
 

wherein L1, L2, a1, a2, b1, and b2 respectively represent Lab components of two colors during calculation of a color difference; ΔL′, ΔC′ab′, and ΔH′ab′ respectively represent a brightness difference, a saturation difference, and a hue difference between two colors; KL, KC, and KH are three constant parameters; and SL, Sc, SH, and RT are intermediate variables obtained through calculation of ΔL′, ΔC′ab′, and ΔH′ab′.