Viet Anh Nguyen Yap-Peng Tan Weisi Lin Adaptive downsampling/upsampling for better video compression at low bit rate. 1624-1627 2008 ISCAS http://dx.doi.org/10.1109/ISCAS.2008.4541745 conf/iscas/2008 db/conf/iscas/iscas2008.html#NguyenTL08