Fusing color and shape descriptors in the recognition of degraded iris images acquired at visible wavelengths

Despite the substantial research into the development of covert iris recognition technologies, no machine to date has been able to reliably perform recognition of human beings in real-world data. This limitation is especially evident in the application of such technology to large-scale identification scenarios, which demand extremely low error rates to avoid frequent false alarms. Most previously published works have used intensity data and performed multi-scale analysis to achieve recognition, obtaining encouraging performance values that are nevertheless far from desirable. This paper presents two key innovations. (1) A recognition scheme is proposed based on techniques that are substantially different from those traditionally used, starting with the dynamic partition of the noise-free iris into disjoint regions from which MPEG-7 color and shape descriptors are extracted. (2) The minimal levels of linear correlation between the outputs produced by the proposed strategy and other state-of-the-art techniques suggest that the fusion of both recognition techniques significantly improve performance, which is regarded as a positive step towards the development of extremely ambitious types of biometric recognition.

► This paper presents a method for the recognition of degraded iris images acquired at visible wavelengths.
► The recognition scheme is based in the definition of homogenous regions inside the iris.
► The description of each region is made by both shape and color MPEG.7 descriptors.
► Minimal levels of linear correlation between the proposed method and state-of-the-art techniques were observed.
► Due to this, significants improvements in performance are obtained when evidence fusion is performed.