Patent ID: 7016419

Claim:
A computer program product for implementing, 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 selectively display video images based on a reduced volume of video data, the computer program product comprising: a computer-readable medium carrying computer executable instructions capable of causing the system to perform the acts of processing the MPEG data to generate a reconstructed digital video stream capable of producing video images in a first video resolution; receiving a request for displaying video images having a second video resolution; subsampling the MPEG data to obtain a reduced volume reconstructed digital video stream corresponding to the second video resolution that is less than the first video resolution, wherein the subsampled MPEG data is subsampled without generating a version of the subsampled data in the first video resolution, wherein subsampling includes decimating IDCT output data by a selected factor to generate decimated IDCT output data, and wherein decimating the IDCT output data includes weighting color parameters of at least first and second IDCT output data samples using at least first and second weighting factors, respectively, and summing the weighted color parameters; and selectively presenting either or both of the first and second reconstructed digital video streams.