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

Claim 0:
1. A computer-implemented method for providing an image-dependent brightness control based on a user-defined value of a peak luminance adjustment parameter to reduce brightness in bright image portions relatively stronger than in dark image portions, the method comprising:
receiving an input image in an image dynamic range;
receiving a minimum display luminance value and a maximum display luminance value defining a display dynamic range of a target display;
generating (420) a first adjusted luminance value for the target display based on the peak luminance adjustment parameter and the maximum display luminance value, wherein the first adjusted luminance value is lower than the maximum display luminance value;
generating (430) a tone-mapped image with a 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 first adjusted luminance value; and
generating (415) an output image for the target display based on the tone-mapped image; wherein generating the first adjusted luminance value (TmaxAdj1) comprises computing, T
    
     max
     
      Adj
      ⁢
      1
     
    
   
   =
   
    T
    ⁢
    max
    *
    
     1
     
      2
      β
     
    
   
  
  ,
 

wherein Tmax denotes the maximum display luminance value and β denotes the peak luminance adjustment parameter.