Majid Mohrekesh Shadrokh Samavi Nader Karimi Shahram Shirani Parisa Behnamfar Motion estimation by affine transforms based on codirectionality of movements. 995-998 2009 CCECE http://dx.doi.org/10.1109/CCECE.2009.5090279 conf/ccece/2009 db/conf/ccece/ccece2009.html#MohrekeshSKSB09