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 decoding apparatus comprising: 
 an input unit configured to receive an input code stream containing a video code stream obtained by encoding a video signal and a reference picture code stream obtained by encoding a reference picture signal;    a first decoding unit configured to decode the reference picture code stream contained in the input code stream to generate a first reference picture signal;    a second decoding unit configured to decode the video code stream contained in the input code stream by selectively using one of a second reference picture signal obtained from a previous picture signal and the first reference picture signal to generate a playback picture signal;    a first determination unit configured to determine whether or not the input code stream is the reference picture code stream;    a second determination unit configured to, when the first determining means determines that the input code stream is the reference picture code stream, determine whether or not to decode the reference picture code stream; and    a third decoding unit configured to decode the input code stream in accordance with a determination result of the second determination unit.    
   
   
       2 . A picture decoding method comprising: 
 receiving an input code stream containing a video code stream obtained by encoding a video signal and a reference picture code stream obtained by encoding a reference picture signal;    decoding the reference picture code stream contained in the input code stream to generate a first reference picture signal;    decoding the video code stream contained in the input code stream by selectively using one of a second reference picture signal obtained from a previous picture signal and the first reference picture signal to generate a playback picture signal;    determining whether or not the input code stream is the reference picture code stream;    determining whether or not to decode the reference picture code stream when determining that the input code stream is the reference picture code stream; and    decoding the input code stream in accordance with a determination result of determine whether or not to decode the reference picture code stream.    
   
   
       3 . 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 code stream containing a video code stream obtained by encoding a video signal and a reference picture code stream obtained by encoding a reference picture signal;    decoding the reference picture code stream contained in the input code stream to generate a first reference picture signal;    decoding the video code stream contained in the input code stream by selectively using one of a second reference picture signal obtained from a previous picture signal and the first reference picture signal to generate a playback picture signal;    determining whether or not the input code stream is the reference picture code stream;    determining whether or not to decode the reference picture code stream when determining that the input code stream is the reference picture code stream; and    decoding the input code stream in accordance with a determination result of determine whether or not to decode the reference picture code stream.    
   
   
       4 . A computer system comprising: 
 means for receiving an input code stream containing a video code stream obtained by encoding a video signal and a reference picture code stream obtained by encoding a reference picture signal;    means for decoding the reference picture code stream contained in the input code stream to generate a first reference picture signal;    means for decoding the video code stream contained in the input code stream by selectively using one of a second reference picture signal obtained from a previous picture signal and the first reference picture signal to generate a playback picture signal;    means for determining whether or not the input code stream is the reference picture code stream;    means for determine whether or not to decode the reference picture code stream when determining that the input code stream is the reference picture code stream; and    means for decoding the input code stream in accordance with a determination result of determine whether or not to decode the reference picture code stream.