Patent ID: 11967261
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A method for adjusting white balance of a spliced screen, wherein the spliced screen comprises at least two display screens, the method comprising:
acquiring an image to be analyzed; the image to be analyzed comprises a picture, to be analyzed, displayed by the display screen to be adjusted, and the display screen to be adjusted is at least a portion of all the display screens of the spliced screen; and
determining a white balance adjustment mode of the display screen, to be adjusted, corresponding to the picture to be analyzed, according to at least the picture to be analyzed in the image to be analyzed,
wherein, before the acquiring the image to be analyzed, the method further comprises:
determining one of the display screens as a reference display screen; acquiring a reference image, wherein the reference image comprises a reference picture displayed by the reference display screen; determining a reference parameter according to the reference picture in the reference image; the display screen to be adjusted is at least a portion of all the display screens of the spliced screen other than the reference display screen;
the determining the white balance adjustment mode of the display screen, to be adjusted, corresponding to the picture to be analyzed, according to at least the picture to be analyzed in the image to be analyzed comprises: determining the white balance adjustment mode of the display screen, to be adjusted, corresponding to the picture to be analyzed, according to the picture to be analyzed in the image to be analyzed and the reference parameter,
wherein three reference images are determined, and reference pictures in the three reference images are respectively a picture with a first color and a maximum gray scale, a picture with a second color and a maximum gray scale, and a picture with a third color and a maximum gray scale; the first color, the second color and the third color constitute three primary colors and are three color channels of each display screen of the spliced screen,
the picture to be analyzed is a white picture with the maximum gray scale,
the determining the reference parameter according to the reference picture in the reference image comprises: determining reference parameters F11, F12, F13, F21, F22, F23, F31, F32 and F33 according to the reference pictures in the reference images;
wherein Fij represents a color component of a jth color in the picture with an ith color and the maximum gray scale;
the determining the white balance adjustment mode of the display screen, to be adjusted, corresponding to the picture to be analyzed, according to the picture to be analyzed in the image to be analyzed and the reference parameter comprises:
determining parameters f1, f2 and f3 of any picture to be analyzed in the image to be analyze; wherein fi represents a color component of the ith color of the picture to be analyze;
determining adjustment coefficients X1, X2, X3 of the picture to be analyzed according to following formula (1), Xi represents a gain coefficient of an ith color channel:, [
       
        
         
          
           f
           ⁢
           1
          
         
        
        
         
          
           f
           ⁢
           2
          
         
        
        
         
          
           f
           ⁢
           3
          
         
        
       
       ]
      
      =
      
       
        [
        
         
          
           
            F
            ⁢
            11
           
          
          
           
            F
            ⁢
            21
           
          
          
           
            F
            ⁢
            31
           
          
         
         
          
           
            F
            ⁢
            12
           
          
          
           
            F
            ⁢
            22
           
          
          
           
            F
            ⁢
            32
           
          
         
         
          
           
            F
            ⁢
            13
           
          
          
           
            F
            ⁢
            23
           
          
          
           
            F
            ⁢
            33
           
          
         
        
        ]
       
       [
       
        
         
          
           X
           ⁢
           1
          
         
        
        
         
          
           X
           ⁢
           2
          
         
        
        
         
          
           X
           ⁢
           3
          
         
        
       
       ]
      
     
     ;
    
   
   
    
     (
     1
     )
    
   
  
 

 and
determining the white balance adjustment mode of the display screen, to be adjusted, corresponding to the picture to be analyzed, according to the adjustment coefficients X1, X2 and X3, the white balance adjustment mode comprises: in response to that Xi is less than a first preset value, increasing the gain of the ith color channel of the display screen, to be adjusted, corresponding to the picture to be analyze; in response to that Xi is greater than a second preset value, reducing the gain of the ith color channel of the display screen, to be adjusted, corresponding to the picture to be analyze; and in response to that the Xi is greater than or equal to the first preset value and less than or equal to the second preset value, keeping the gain of the ith color channel of the display screen, to be adjusted, corresponding to the picture to be analyzed, unchanged.