TY - JOUR T1 - Sensor for distance estimation using FFT of images JF - Sensors Y1 - 2009 A1 - Jose L. Lazaro A1 - Angel Cano A1 - P.R. Fernández A1 - Carlos Andres Luna AB - In this paper, the problem of how to estimate the distance between an infrared emitter diode (IRED) and a camera from pixel grey-level intensities is examined from a practical standpoint. Magnitudes that affect grey level intensity were defined and related to the zero frequency component from the FFT image. A general model was also described and tested for distance estimation over the range from 420 to 800 cm using a differential methodology. Method accuracy is over 3%. VL - 9 UR - http://www.mdpi.com/1424-8220/9/12/10434/ IS - 12 ER -