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Multispectral imaging of the ocular fundus using light emitting diode illumination
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10.1063/1.3478001
/content/aip/journal/rsi/81/9/10.1063/1.3478001
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/9/10.1063/1.3478001

Figures

Image of FIG. 1.
FIG. 1.

Block diagram of retinal imaging system.

Image of FIG. 2.
FIG. 2.

CCD imager attached to fundus camera. A—CCD camera, B—viewing eyepiece, C—support structure for camera.

Image of FIG. 3.
FIG. 3.

Images from subject B—from left to right and top to bottom, the wavelengths are 504, 525, 557, 582, 600, and 620 nm. The images shown are an average of three exposures and have been scaled for display purposes to the same minimum and maximum intensity and gamma corrected with a coefficient of 0.7. The reduction in visible features as the wavelength increases can be clearly seen. This is caused by the lower absorption coefficient of both hemoglobins and melanin at the longer wavelengths.

Tables

Generic image for table
Table I.

Image acquisition parameters used for retinal imaging: central wavelength of the filtered LED, the source intensity, and the exposure duration.

Generic image for table
Table II.

Linear displacement between two image frames taken at different wavelengths of the static artificial eye. Only the results of the sequential registration are shown as the results of registration to the image at 525 nm were very similar. Values are shown in pixels (pixel size is approximately ).

Generic image for table
Table III.

Linear displacement showing the magnitude of translation required to align two images taken at five different wavelengths in the same sequence. is a translation vector returned by the registration algorithm (Ref. 17) (see Sec. III B). Values are shown in pixels (pixel size is approximately ).

Generic image for table
Table IV.

SNR (decibel) measurements from subject B. A region was used from each of the respective areas. The SNR was computed using .

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/content/aip/journal/rsi/81/9/10.1063/1.3478001
2010-09-29
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multispectral imaging of the ocular fundus using light emitting diode illumination
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/9/10.1063/1.3478001
10.1063/1.3478001
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