Takeyuki Uehara Reihaneh Safavi-Naini Philip Ogunbona Recovering DC Coefficients in Block-Based DCT. 3592-3596 2006 15 IEEE Transactions on Image Processing 11 http://dx.doi.org/10.1109/TIP.2006.881939 db/journals/tip/tip15.html#UeharaSO06