Timo Ahonen Esa Rahtu Ville Ojansivu Janne Heikkilä Recognition of blurred faces using Local Phase Quantization. 1-4 2008 ICPR http://dx.doi.org/10.1109/ICPR.2008.4761847 conf/icpr/2008 db/conf/icpr/icpr2008.html#AhonenROH08