Resolution conversion integrated with quantization in coded domain for DV to MPEG-4 transcoder

We propose a new algorithm for the fast conversion of MPEG-4 from DV. DV, which is a video compression coding format, is adopted by commercial and non-commercial digital video cameras and achieves high video quality using a fixed high bitrate of 25 Mbps. However, compared with MPEG-4, which is used extensively in IP or mobile phone applications, DV has a higher storage and transmission cost. This is due to the extremely low coding efficiency of DV required to maintain high quality for frame-accurate editing. In this paper, we analyze the difference between DV and MPEG-4, and propose a new algorithm for the fast conversion of MPEG-4 from DV. Our algorithm accelerates the conversion process in the coded domain using the property of conversion matrices, where resolution conversion, quantization, and inverse quantization are integrated. The experimental results indicate that, while the integration and approximation of a conversion matrix do not affect the video quality, this could greatly reduce the number of operands.