Patent ID: 8767828

Claim:
A video decoder that decodes video comprising: (a) an entropy decoder that decodes a bitstream defining said video; (b) an inverse transformation that transforms said decoded bitstream; (c) a predictor that selectively performs an intra-prediction and a motion compensated prediction on said decoded bitstream; (d) a buffer storing compressed image data retrievable from said buffer by said predictor when performing said motion compensated prediction wherein said compressed image data includes a low-resolution data set and selectively includes a high-resolution data set, where said low resolution data set is independent of said high resolution data set and used for decoding in a low resolution mode and wherein said low resolution data set and said high resolution data set together comprise a full resolution data set, and said low resolution data set and said high resolution data set are both used when decoding in a high resolution mode; and (e) a de-blocking filter that deblocks in high resolution mode over a boundary between a first image block associated with data in said low-resolution data set and a second image block, associated with data in said high resolution data set, for which said buffer has no residual data, because said encoder selectively did not include said high-resolution data set, and wherein said deblocking filter is capable of de-blocking in high resolution when said buffer selectively does not include said high resolution data set.