this seems to be a solution for zernike 3d moments: https://www.google.ch/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0CC8QFjAC&url=http%3A%2F%2Fwww.degruyter.com%2Fdg%2Fviewarticle.fullcontentlink%3Apdfeventlink%2F%24002fj%24002fmlbmb.2012.1.issue%24002fmlbmb-2013-0004%24002fmlbmb-2013-0004.xml%3Ft%3Aac%3Dj%24002fmlbmb.2012.1.issue%24002fmlbmb-2013-0004%24002fmlbmb-2013-0004.xml&ei=U5pEVc60AYuwUYL7gNAM&usg=AFQjCNHVc7NC1ihxB_GXryT36amP1kJQQw