Patent ID: 11871036
Assignee: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. The apparatus for compressing JPEG images according to claim 5, wherein the DC coefficient estimation unit generates a predicted quantized DC pixel value ({circumflex over (p)}x,yDC) by decoding the pixel at the specific block location (x, y) by the following Equation 5:, p
       ^
      
      
       x
       ,
       y
      
      DC
     
     =
     
      
       
        
         
          ∑
          
           n
           =
           0
          
          7
         
         
          (
          
           
            N
            
             7
             ,
             n
            
           
           -
           
            p
            
             0
             ,
             n
            
            AC
           
           -
           128
          
          )
         
        
        +
        
         (
         
          
           W
           
            n
            ,
            7
           
          
          -
          
           p
           
            n
            ,
            0
           
           AC
          
          -
          128
         
         )
        
       
       16
      
      =
      
       
        
         
          
           ∑
           
            n
            =
            0
           
           7
          
          
           N
           
            7
            ,
            n
           
          
         
         -
         
          p
          
           0
           ,
           n
          
          AC
         
         +
         
          W
          
           n
           ,
           7
          
         
         -
         
          p
          
           n
           ,
           0
          
          AC
         
        
        16
       
       -
       128
      
     
    
   
   
    
     [
     
      Equation
      ⁢
         
      5
     
     ]
    
   
  
 

where N7,n is a nearest pixel on a northern side of the target block among the decoded pixel values, Wn,7 is a nearest pixel on a western side of the target block among the decoded pixel values, p0,nAC is a pixel adjacent to block N among the pixels of the target block decoded using only the quantized AC, and pn,0AC is a pixel adjacent to block W among the pixels of the target block decoded using only the quantized AC.