抄録
The spatial property of video signals is different from their temporal property. If the 3-D DFT is applied to video
signals, mainly phases of specific DFT coefficients will be affected by apparent motions of moving objects. On the other hand,
the 3-D DCT is equivalent to the following transform, that is to say, video signals are first converted into even-symmetric
signals about the origin, and then the symmetric signals undergo 3-D frequency analysis. Object’s motion produces many
significant 3-D DCT coefficients. Obviously, the 3-D DFT is superior to the 3-D DCT in energy compaction. This paper shows
the superiority of the 3-D DFT over the 3-D DCT, through theoretical analysis and experimental simulations.
