| 摘要 |
<p>The invention relates to a transcoding method and device for converting input coded signals previously quantized with a first quantization scale Q1 into output coded signals quantized with a second quantization scale Q2. The transcoding device comprises a variable length decoder, a quantization step modifying stage, and a variable length encoder, said modifying stage itself comprising: (i) means of selection of one out of two parallel requantizing devices; (ii) a first requantizing device including prediction provided to be selected when the coding type corresponds to pictures used as references; (iii) a second requantizing device not including prediction provided to be selected when said coding type does not correspond to reference pictures.</p> |
