<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Jose L. Lazaro</style></author><author><style face="normal" font="default" size="100%">Angel Cano</style></author><author><style face="normal" font="default" size="100%">P.R. Fernández</style></author><author><style face="normal" font="default" size="100%">Carlos Andres Luna</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Sensor for distance estimation using FFT of images</style></title><secondary-title><style face="normal" font="default" size="100%">Sensors</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2009</style></year><pub-dates><date><style  face="normal" font="default" size="100%">12/2009</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.mdpi.com/1424-8220/9/12/10434/</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">10434-10446</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">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%.</style></abstract><issue><style face="normal" font="default" size="100%">12</style></issue><accession-num><style face="normal" font="default" size="100%">1.870</style></accession-num><call-num><style face="normal" font="default" size="100%">Instruments &amp; Instrumentation</style></call-num></record></records></xml>