| 摘要 |
By coding (ENC1) data (D), coded data (CD) and, in addition, a set of parameters (PAR) for decoding (DEC1) the coded data (CD) are obtained. MPEG video coding is an example of such a coding. The coded data (CD) is modified by carrying out the following steps. The coded data (CD) is, at least partially, decoded (DEC1) so as to obtain decoded data (DD). The decoded data (DD) is modified (MOD) so as to obtain modified data (MD). The modified data (MD) is coded (ENC) so as to obtain coded modified data (CMD). It is examined (EXAM) whether a satisfactory result will be obtained if the set of parameters (PAR) for decoding the coded data (CD) is applied for decoding (DEC2) the coded modified data (CMD). If the result is satisfactory, the set of parameters (PAR) for decoding the coded data (CD) is added to the coded modified data (CMD). If the result is not satisfactory, a new set of parameters (PAR) is established (ADP) and the new set of parameters (APAR) is added to the coded modified data (CMD). Accordingly, the coded data (CD) can be modified with relatively little distortion. An example of a modification which can be carried out in this manner is a 422/420 format conversion of MPEG-coded video. |
