An Integrated Approach for Downscaling MPEG Video

Digital video databases are widely available in compressed format. In many applications such as video browsing, picture in picture, video conferencing etc. data transfer at lower bit rate is required. This requires downscaling of the video before transmission. The conventional spatial domain approach for downscaling video is computationally very expensive. The computation can greatly be reduced if downscaling and inverse motion compensation (IMC) are performed in Discrete Cosine Transform (DCT) domain. There are many algorithms in the literature to perform IMC in the DCT domain. In this paper, we propose an efficient integrated technique to perform IMC and downscaling in DCT domain. This new approach results in significant improvement in computational complexity.