Figure 3

An overview of the proposed method for extracting global texture variations. The green dashed line separates the region of interest into two subregions which for each the global feature extraction is performed. The red cross indicates the omission of the left half of the normalized image corresponding with the upper half of the iris which is often occluded by the eyelids and eyelashes. Note that, in the case of NIR images, the upper half of the iris is not discarded.