TY - JOUR T1 - Using the Standard Deviation of a Region of Interest in an Image to Estimate Camera to Emitter Distance JF - Sensors Y1 - 2012 A1 - Angel Cano A1 - Jose L. Lazaro A1 - A. Infante A1 - Felipe Espinosa A1 - Y. Pompa A1 - P. Fernández PB - MDPI CY - Suiza VL - 12 IS - 5 ER -