A new instrument to measure the shape of the cornea based on pseudorandom color coding

Author

Vos, Franciscus M. ; Van der Heijde, Rob G L ; Spoelder, Hans J W ; Van Stokkum, Ivo H M ; Groen, Franciscus C A

Author_Institution

Dept. of Phys. & Astron., Vrije Univ., Amsterdam, Netherlands

Volume

46

Issue

4

fYear

1997

fDate

8/1/1997 12:00:00 AM

Firstpage

794

Lastpage

797

Abstract

We have developed a prototype instrument providing a new way to measure the shape of the cornea. Our approach exploits properties of pseudorandom binary arrays (PRBAs). Encoded in a colored pattern (stimulus) that is mirrored to the eye, a large PRBA allows for unique identification of unambiguously characterized positions both in stimulus and 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

biology computing; biomedical measurement; computerised instrumentation; eye; image coding; image colour analysis; medical image processing; parameter estimation; shape measurement; biomedical signal analysis; colored pattern; cornea shape measurement; identification; image processing; integral reconstruction; parameter estimation; prototype instrument; pseudorandom binary arrays; pseudorandom color coding; reflected image; robust measurement; stimulus; Astronomy; Biomedical measurements; Cornea; Instruments; Optical refraction; Physics; Reflection; Robustness; Shape measurement; Surface reconstruction;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.650775

Filename

650775