Title :
A new PRBA-based instrument to measure the shape of the cornea
Author :
Vos, F.M. ; van der Heijde, G.L. ; Spoelder, H.J.W. ; van Stokkum, I.H.M. ; Groen, Frans C A
Author_Institution :
Dept. of Phys. & Astron., Vrije Univ., Amsterdam, Netherlands
Abstract :
We have developed a prototype-instrument providing a new way to measure the shape of the cornea. Our approach exploits properties of pseudo random binary arrays (PRBAs). Encoded in a coloured pattern (stimulus) that is mirrored to the eye PRBAs allow for unique characterization of positions both in the stimulus and the reflected image. This is used to come to an integral reconstruction of the cornea. It is demonstrated that the new technique contributes to a very robust measurement method
Keywords :
CCD image sensors; biomedical measurement; colour vision; eye; image recognition; image reconstruction; light refraction; random processes; shape measurement; CCD image sensor; PRBA; coloured pattern; cornea; identification; integral reconstruction; keratometer; pattern recognition; prototype-instrument; pseudo random binary arrays; reconstruction; reflected image; relocation; shape; stimulus; unique characterization; Astronomy; Cornea; Extraterrestrial measurements; Humans; Image reconstruction; Instruments; Optical refraction; Physics; Reflection; Shape measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1996. IMTC-96. Conference Proceedings. Quality Measurements: The Indispensable Bridge between Theory and Reality., IEEE
Conference_Location :
Brussels
Print_ISBN :
0-7803-3312-8
DOI :
10.1109/IMTC.1996.507417
