From 8-tap DCT to 4-tap Integer Transform for MPEG to H.264/AVC Transcoding (MA-L3)

Author(s) : Bo Shen (Hewlett-Packard Company, USA)

Abstract : H.26L uses a 4-tap integer transform ({\em DCT-like}) to produce transform coefficients. This is different than the 8-tap DCT that is used in most prior video coding standards such as MPEG. The paper propose two integer algorithms for transcoding from 8-tap DCT data to 4-tap DCT-like data. The approximate nature of the integer transcoding algorithms is quantitively evaluated. The results shows that the approximation can be hidden in most cases when bit rate reduction is considered.

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