Rate-distortion based temporal filtering for video compression

We consider the temporal DPCM loop at the heart of most modern high performance video coders. Targeting low bitrate-low complexity video applications, it is shown that DPCM is inefficient in this region. The DPCM codec is analyzed in the low bitrate region and rate-distortion optimal modifications are proposed that do not violate the low complexity requirement. The proposed modifications involve negligible added complexity at the encoder and no added complexity at the decoder and are thus compatible with standard coders and bit streams.