I'm not sure that counts as an explanation :) For details you could read his published papers on the subject: http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publ

I'm not sure that counts as an explanation :) For details you could read his published papers on the subject: http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publications/2010_icip.pdf http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publications/20... http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publications/2010_icpr.pdf http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publications/20... http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publications/2010_cvpr.pdf http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publications/20... http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publications/2009_olcv.pdf http://info.ee.surrey.ac.uk/Personal/Z.Kalal/Publications/20...