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School of Computer Science

Lincoln School of Computer Science
University of Lincoln
Brayford Pool
Lincoln
LN6 7TS
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Observers

Human observers are subjective and prone to inter-observer and intra-observer variability; thus three independent observer marks are provided, each of whom marks a set of randomly selected vascular segments.


Observer 1

The first observer (O1) is an ophthalmic specialist with research interests in automated assessment of diabetic retinopathy and evaluation of retinal vascular geometry; he has five year experience in retinal fundus images analysis.


Observer 2

The second observer (O2) is a specialist optometrist and a qualified secondary grader for diabetic retinopathy; he has been previously involved with different research projects involving handling and analysis of digital images with tasks for defining vascular and non vascular diabetic lesions.


Observer 3

The third observer (O3) has a satisfactory basic medical background being an experienced laboratory specialist. She received a training session in defining and marking retinal vascular segments before starting independent marking of the selected segments for the experiment. Her initial training set was reviewed and independently assessed by an ophthalmic consultant.


The Reference Standered

The mean of the measured diameters from the three observers is used as the reference standard (O).

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Dr. Bashir Al-Diri (PhD., MSc., BSc., FHEA)
Lincoln School of Computer Science
University of Lincoln
Brayford Pool
Lincoln LN6 7TS
United Kingdom
Email My Webpage Phone: +44 1522 837111
Fax: +44 1522 886974