@TECHREPORT{tr_pmroth09,
    author = {Peter M. Roth and Christian Leistner and Horst Bischof},
    title = {Learning Person Detectors from Multiple Cameras},
    institution = {Graz University of Technology, Inst. f.  Computer,
        Graphics and Vision},
    number = {ICG-TR-03/09},
    year = {2009}
}