Quantization method for bit rate transcoding applications

摘要

The present invention relates to a transcoding device comprising partial decoding means (PD) for receiving a primary coded signal (S1) and providing a dequantized signal (IQS) including DCT coefficients; quantization means (Q) for receiving the dequantized signal and providing a quantized signal (QS) using correction matrices (COR); and partial encoding means (PE) for receiving the quantized signal and providing a secondary coded signal (S2). Such a transcoding device allows the primary signal encoded at a first bit rate to be converted into the secondary signal encoded at a second bit rate lower than the first one while an optimum signal quality is maintained.