Sensor for Distance Estimation Using FFT of Images.
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%.
Electronics Department, University of Alcalá, Superior Polytechnic School, University Campus, Alcalá de Henares (28871), Madrid, Spain; E-Mail:  angel.cano@depeca.uah.es  (A.E.C.)Telecommunication Department, University of Oriente, Av. de las Américas, SN, Santiago de Cuba (90900), Cuba; E-Mails:  pedro.fernandez@depeca.uah.es  (P.R.F.);  caluna@depeca.uah.es  (C.A.L.).
José L
JL
Lázaro
Angel E
AE
Cano
Pedro R
PR
Fernández
Carlos A
CA
Luna