Patent ID: 6850571

Claim:
In a system for processing MPEG data in preparation for displaying video images encoded in the MPEG data, a method for subsampling the MPEG data to reduce the volume of video data processed to display the video images, comprising the acts of: processing one or more motion vectors in order to produce coordinates for fetching prediction data from a previously decoded and subsampled reference frame; processing the reference frame and the one or more motion vectors of the MPEG data using a frame prediction module to generate predicted subsampled frame data; processing frequency coefficients of the MPEG data using an inverse discrete cosine transformer (IDCT) to generate IDCT output data; subsampling the IDCT output data by a selected factor to generate subsampled IDCT output data, wherein subsampling the IDCT output data includes weighting color parameters of at least first and second spatial samples using at least first and second weighting factors, respectively, and summing the weighted color parameters of the at least first and second spatial samples to generate a color parameter of a subsample that corresponds to the at at least first and second spatial samples; and summing the predicted subsampled frame data and the subsampled IDCT output data to generate video images encoded in a reduced volume of video data.