Bigun, J.2006-06-142006-06-142006-06-14199310.1016/0167-8655(93)90108-Phttps://infoscience.epfl.ch/handle/20.500.14299/230611WOS:A1993LL59100008LTS1Unsupervised feature reduction in image segmentation by local transformstext::journal::journal article::research article