Lung segmentation on standard and mobile chest radiographs using oriented Gaussian derivatives filter March 4, 2015 BioMedical Engineering OnLine 2015, 14:20Â doi:10.1186/s12938-015-0014-8 Wan Siti Halimatul Munirah Wan Ahmad, W Mimi Diyana W Zaki and Mohammad Faizal Ahmad Fauzi contributed equally to this work. Published: 4 March 2015