Patent ID: 11887560
Assignee: DOLBY LABORATORIES LICENSING CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 2:
3. A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations, the operations comprising:
receiving encoded image data; and
decoding the image data, characterized in that the decoding comprises mapping digital code values in the encoded image data to normalized luminance values based at least in part on a functional model of:, Y
   =
   
    
     (
     
      
       max
       [
       
        
         (
         
          
           V
           
            1
            /
            m
           
          
          -
          
           c
           1
          
         
         )
        
        ,
        0
       
       ]
      
      
       
        c
        2
       
       -
       
        
         c
         3
        
        ⁢
        
         V
         
          1
          /
          m
         
        
       
      
     
     )
    
    
     1
     /
     n
    
   
  
  ,
 

wherein:
Y is a normalized luminance value, wherein 0≤Y≤1,
V is a normalized value of a corresponding one of the digital code values D of the encoded image data, wherein 0≤V≤1, and
n, m, c1, c2, and c3 are predetermined values, with:, n
   =
   
    
     
      
       2
       ⁢
       6
       ⁢
       1
       ⁢
       0
      
      
       4
       ⁢
       0
       ⁢
       9
       ⁢
       6
      
     
     ×
     
      1
      4
     
    
    ≃
    0.1593017578125
   
  
  ;
 

 
  
   m
   =
   
    
     
      
       2
       ⁢
       5
       ⁢
       2
       ⁢
       3
      
      
       4
       ⁢
       0
       ⁢
       9
       ⁢
       6
      
     
     ×
     128
    
    ≃
    78.84375
   
  
  ;
 

 
  
   
    c
    1
   
   =
   
    
     
      c
      3
     
     -
     
      c
      2
     
     +
     1
    
    =
    
     
      
       3
       ⁢
       4
       ⁢
       2
       ⁢
       4
      
      
       4
       ⁢
       0
       ⁢
       9
       ⁢
       6
      
     
     ≃
     0.8359375
    
   
  
  ;
 

 
  
   
    c
    2
   
   =
   
    
     
      
       2
       ⁢
       4
       ⁢
       1
       ⁢
       3
      
      
       4
       ⁢
       0
       ⁢
       9
       ⁢
       6
      
     
     ×
     32
    
    ≃
    18.8515656
   
  
  ;
  and
 

 
  
   c
   3
  
  =
  
   
    
     
      2
      ⁢
      3
      ⁢
      9
      ⁢
      2
     
     
      4
      ⁢
      0
      ⁢
      9
      ⁢
      6
     
    
    ×
    32
   
   ≃
   
    18.6875
    .