Til Aach Ingo Stuke Cicero Mota Erhardt Barth Estimation of multiple local orientations in image signals. 553-556 2004 ICASSP (3) https://doi.org/10.1109/ICASSP.2004.1326604 conf/icassp/2004 db/conf/icassp/icassp2004.html#AachSMB04