Extrema points are usually applied to solve everyday problems, for example, to determine the potential of a created tool and for optimisation. In this study, extrema points were used to help determine the region of interest (ROI) for the iris  in  iris  recognition  systems.  Iris  recognitionis  an  automated  method  ofbiometricidentification  that  uses mathematical  pattern-recognition  techniques  on  the  images  of  one  or  both irisesof  an  individual'seyes,  where  the complex patterns are unique, stable, and can be seen from a distance. In orderto obtain accurate results, the iris must be localised correctly. Hence, to address this issue, this paper proposed a method of iris localisation in the case of ideal and non-ideal iris images. In this study, the algorithm was based on finding the classification for the region of interest (ROI) with the help of a Support Vector Machine (SVM) by applying a histogram of grey level values as a descriptor in each.....

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