Patent ID: 11935492
Assignee: DOLBY LABORATORIES LICENSING CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. The method of claim 1, wherein the method is further based on a user-defined value of an average picture level boost adjustment parameter to increase brightness in dark image portions relatively stronger than in bright image portions, the method further comprising:
generating (440) a second adjusted luminance value for the target display based on the average picture level boost adjustment parameter and the first adjusted luminance value, wherein the second adjusted luminance value is lower than the maximum display luminance value;
generating (455) the tone-mapped image with the tone-mapping function and the input image, wherein the tone-mapping function maps the image dynamic range to the minimum display luminance value and the second adjusted luminance value; and
generating (460) a first output image for the target display by applying a linear mapping to the tone-mapped image, wherein parameters of the linear mapping are based on the minimum display luminance value, the first adjusted luminance value, and the second adjusted luminance value;
wherein generating the second adjusted luminance value (TmaxAdj2) comprises computing, T
    
     max
     
      Adj
      ⁢
      2
     
    
   
   =
   
    T
    
     max
     
      Adj
      ⁢
      1
     
    
    *
    
     1
     
      2
      a
     
    
   
  
  ,
 

wherein TmaxAdj1 denotes the first adjusted luminance value and α denotes the average picture level boost adjustment parameter.