A Fast DV to MPEG-4 Transcoder Integrated With Resolution Conversion and Quantization

We propose a fast transcoder from digital video (DV) to MPEG-4 in the coded domain. Since DV is interlaced sequence whereas MPEG-4 (SIF) is progressive sequence and different discrete cosine transform (DCT) mode $({\hbox {2}}\ast{\hbox {4}}\ast{\hbox {8}}{\hbox {DCT}})$ is used in DV, different compressed domain transcoding method from that of MPEG to MPEG conversion is required. We have exploited matrix conversion reflecting these properties and introduce approximation and integration of resolution conversion and quantization process. Simulation results of DV to MPEG-4 conversion show that the proposed method can achieve very fast conversion while maintaining high transcoding performance when compared with base-band transcoding and siginificant improvement over conventional method is also realized.