@article {783,
	title = {Sensor for distance estimation using FFT of images},
	journal = {Sensors},
	volume = {9},
	year = {2009},
	month = {12/2009},
	pages = {10434-10446},
	abstract = {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\%.},
	issn = {1424-8220},
	doi = {10.3390/s91210434},
	url = {http://www.mdpi.com/1424-8220/9/12/10434/},
	author = {Jose L. Lazaro and Angel Cano and P.R. Fern{\'a}ndez and Carlos Andres Luna}
}
