R. Venkatesh Babu S. Suresh Andrew Perkis No-reference JPEG-image quality assessment using GAP-RBF. 1493-1503 2007 87 Signal Processing 6 http://dx.doi.org/10.1016/j.sigpro.2006.12.014 db/journals/sigpro/sigpro87.html#BabuSP07