Picture encoding method and apparatus and picture decoding method and apparatus

Abstract

A picture encoding method includes receiving an input video signal, encoding the video signal using a reference picture signal to generate a video code stream, encoding the reference picture signal to generate a reference picture code stream, and multiplexing the video code stream with the reference picture code stream to generate an output code stream.

1 . A picture encoding apparatus comprising: 
 a receiving unit configured to receive an input video signal;    a first encoding unit configured to encode the video signal by using a reference picture signal to generate a video code stream, the first encoding unit including a frame memory which stores a local decoded picture signal generated in encoding the video signal as the reference picture signal, and a motion compensation unit configured to subject to motion compensation the reference picture signal read out from the frame memory;    a second encoding unit configured to encode the reference picture signal motion-compensated by the motion compensation unit to generate a reference picture code stream; and    a multiplexing unit configured to multiplex the video code stream with the reference picture code stream to generate an output code stream.    
   
   
       2 . The apparatus according to  claim 1 , wherein the first encoding unit is configured to encode the video signal in units of a macroblock, the second encoding unit is configured to encode the reference picture signal in units of a macroblock, and the multiplexing unit is configured to multiplex the video code stream with the reference picture code stream in units of a macroblock.  
   
   
       3 . A picture encoding method comprising: 
 receiving an input video signal;    encoding the video signal by using a reference picture signal to generate a video code stream;    storing a local decoded picture signal generated in encoding the video signal as the reference picture signal in a frame memory which stores;    motion-compensating the reference picture signal read out from the frame memory;    encoding the motion-compensated reference picture signal to generate a reference picture code stream; and    multiplexing the video code stream with the reference picture code stream to generate an output code stream.    
   
   
       4 . The method according to  claim 3 , wherein the encoding the video signal includes encoding the video signal in units of a macroblock, the encoding the motion-compensated reference picture includes encoding the motion-compensated reference picture signal in units of a macroblock, and the multiplexing includes multiplexing the video code stream with the reference picture code stream in units of a macroblock.  
   
   
       5 . A computer readable storage medium storing instructions of a computer program which when executed by a computer results in performance of steps comprising: 
 receiving an input video signal;    encoding the video signal by using a reference picture signal to generate a video code stream;    storing a local decoded picture signal generated in encoding the video signal as the reference picture signal in a frame memory which stores;    motion-compensating the reference picture signal read out from the frame memory;    encoding the motion-compensated reference picture signal to generate a reference picture code stream; and    multiplexing the video code stream with the reference picture code stream to generate an output code stream.    
   
   
       6 . The computer readable storage medium according to  claim 5 , wherein the encoding the video signal includes encoding the video signal in units of a macroblock, the encoding the motion-compensated reference picture includes encoding the motion-compensated reference picture signal in units of a macroblock, and the multiplexing includes multiplexing the video code stream with the reference picture code stream in units of a macroblock.  
   
   
       7 . A computer system comprising: 
 means for receiving an input video signal;    means for encoding the video signal by using a reference picture signal to generate a video code stream;    means for storing a local decoded picture signal generated in encoding the video signal as the reference picture signal in a frame memory which stores;    means for motion-compensating the reference picture signal read out from the frame memory;    means for encoding the motion-compensated reference picture signal to generate a reference picture code stream; and    means for multiplexing the video code stream with the reference picture code stream to generate an output code stream.    
   
   
       8 . The computer system according to  claim 7 , wherein the means for encoding the video signal includes means for encoding the video signal in units of a macroblock, the means for encoding the motion-compensated reference picture includes means for encoding the motion-compensated reference picture signal in units of a macroblock, and the multiplexing means includes means for multiplexing the video code stream with the reference picture code stream in units of a macroblock.