Patent ID: 6266374
Filing Date: 2001-07-24
Classification: H04N

Abstract:
A digital video decoding apparatus for a HDTV comprising:a variable length decoder (VLD) for variable-length decoding input compressed video data of upper or lower level;an inverse zigzag scan decoder (IZZ) for zigzag-scan decoding the output data of said VLD;an inverse quantizer for inverse-quantization converting the output data of said IZZ;a first inverse DCT (1IDCT) for performing inverse DCT with respect to the output data of said inverse quantizer to output restored differential video data of an upper level;a second inverse DCT (2IDCT) for performing inverse DCT with respect to the output data of said inverse quantizer to output restored differential video data of a lower level;a frequency-divider for frequency-dividing-by-two the motion vector (MV) values of upper level output from said VLD;a motion compensator for receiving the motion vector (MV) values of low level output from said VLD, the previous restored video data or the motion vector (MV) values of high level output from said frequency-divider and the previous restored video data output from a second two-dimensional (2D) filter to output motion-compensation data for each changed picture; anda frame memory for storing and outputting a restored video data obtained either by adding the motion-compensated data from said motion compensator to the restored differential video data from said second IDCT, or by adding the motion-compensated data from said motion compensator to the restored differential video data from said first IDCT and respectively subjecting to filtering and sampling rate conversion according to ratios relative to X- and Y-axis sizes of a video to be restored.