Xiaolin Wu Xiangjun Zhang Xiaohan Wang Low Bit-Rate Image Compression via Adaptive Down-Sampling and Constrained Least Squares Upconversion. 552-561 2009 18 IEEE Transactions on Image Processing 3 http://dx.doi.org/10.1109/TIP.2008.2010638 db/journals/tip/tip18.html#WuZW09