Pupil contour extraction method of anti-light spot interference for iris image captured in visible light

Abstract

Point light sources always reflect on color iris image captured by portable color iris image capturing device, which will affect the pupil contour extraction. A pupil’s contour extraction method of anti-light spot interference is given in this paper to solve the problem. Firstly, the expanded pupil region is unfolded into a rectangle image. Secondly, all the light spot regions in the rectangle image are positioned by projecting method of axial directions after binarization and median filtering. Thirdly, these regions are filled by image inpainting technique based on fast marching method. Then, pupil contour extraction can be launched. Next, those regions which are close to contour line are repaired so that the entire exact pupil contour is finally extracted out. In addition, the experiment about this method is conducted with 200 color iris images. The results show that this method has considerable validity and adaptability.