Abstract—In this paper, we propose a generalized discrete
cosine transform (DCT) decimation scheme for DCT-domain
spatial downscaling which performs two-fold decimation on
subframes of a flexible size larger than the traditional 8 8
block size to improve the visual quality. Efficient sparse-matrix
representations are then derived to reduce the computation of the
proposed DCT decimation method. We compare the antialiasing
filtering performances and computational complexities of the
proposed downscaling scheme with the existing DCT-domain and
pixel-domain downscaling schemes. Our analysis shows that the
proposed scheme can reduce the aliasing artifact compared to the
pixel-domain downscaling schemes, whereas the computational
complexity may be increased. Experimental results are reported
to show the efficacy of the proposed approach.
Relation:
IEEE Transactions on Circuits and Systems for Video Technology
