Abstract
Apparatus and method for low-complexity spatial downscaling video transcoder are disclosed. The apparatus comprises a decoder having a reduced DCT-MC unit, a DCT-domain downscaling unit, and an encoder. The decoder performs the DCT-MC operation at a reduced-resolution for P-/B-frames in an MPEG coded bitstream. The DCT-domain downscaling unit is used for spatial downscaling in the DCT-domain. After the downscaling and the motion vectors re-sampling, the encoder determines the encoding modes and outputs the encoded bitstream. This invention can achieve significant computation reduction and speeds up the transcoder compared with the original CDDT without any quality degradation.