Inspec keywords: image fusion; eye; visual databases; gaze tracking; filtering theory; infrared imaging; iris recognition; image sampling; feature extraction; image matching

Other keywords: retinotopic sampling grids; NIR sensors; facial region; frequency-adaptive automatic eye detection; near-infrared periocular recognition; error robustness; near-infrared sensors; input image; iris matchers; NIR data; fusion experiments; VW range; sampling grid density reduction; one-dimensional convolutions; Gabor features; complex symmetry fllters; detection fllter separability; scale changes robustness; visible data; visible-light periocular recognition; visible databases; visible range; eye centre; Gabor analysis

Subjects: Image recognition; Filtering methods in signal processing; Spatial and pictorial databases; Computer vision and image processing techniques