Shape-from-focus for real-time terahertz 3D imaging Perraud, J. -B. ; Guillet, J. -P. ; Redon, O. ; Hamdi, M. ; Simoens, F. ; Mounaix, P. Abstract Publication: Optics Letters Pub Date: February 2019 DOI: 10.1364/OL.44.000483 Bibcode: 2019OptL...44..483P