M. Bi et al., SHAPE-ADAPTIVE DCT FOR GENERIC CODING OF VIDEO - COMMENT, IEEE transactions on circuits and systems for video technology, 6(6), 1996, pp. 686-688
Contrary to one of the key conclusions of the above paper,(1) the cros
s-correlation of the 1-D SA-DCT coefficients located in two columns of
different sizes does not necessarily take maximum values at the same
indices, The correct way to measure the cross-correlation of the SA-DC
T coefficients after the first stage of the transform is presented in
this letter, The idea of implementing shape-adaptive DCT and some aspe
cts of their work could nevertheless be useful.