Ex parte IGARASHI et al. - Page 2

          Appeal No. 1998-0884                                       Page 2           
          Application No. 08/084,642                                                  

               The invention at issue in this appeal relates to                       
          predictive encoding of a television picture.  By reducing                   
          temporal redundance between successive television pictures,                 
          predictive encoding avoids the need to transmit a picture in                
          its entirety.  More specifically, corrections are applied to a              
          previously encoded picture to obtain a current picture.                     
          Frame-based motion compensation and field-based motion                      
          compensation are known types of predictive encoding.                        

               In the invention, a television picture is treated as a                 
          mosaic of areas.  Each area is predictively encoded using                   
          either frame-based motion compensation or field-based motion                
          compensation, depending on which will produce the least amount              
          of motion compensation data.  Frame-based predictive encoding               
          typically is used for areas that are stationary during a                    
          sequence of pictures.  Field-based predictive encoding                      
          typically is used for areas exhibiting movement in the series               
          of pictures.  The type of orthogonal transformation is                      
          selected to match the type of predictive encoding.  Such                    
          selection simplifies the construction of an encoder according               
          to the invention.                                                           

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