| 摘要 |
<p>The invention relates to a scalable video transcoding method for transcoding an input video signal coded in accordance with the MPEG-2 video standard. It is an object of the invention to provide a method and device for modifying data in a coded data signal through the use of standard motion compensation processing steps used in MPEG-2 video decoders and encoders. To this end, an adding and a subtracting sub-step are inserted into the prediction loop for shifting the dynamic of the coding error so that it can be stored in a standard memory device dedicated to storing 8-bit unsigned values. Secondly, said subtracting sub-step allows to use a standard prediction step while reducing the quality drift resulting from data interpolation.</p> |
