Iris

A wide range of real-world applications, including computational photography (glint reflection) and augmented reality effects (virtual avatars) rely on accurately tracking the iris within an eye. This is a challenging task to solve on mobile devices, due to the limited computing resources, variable light conditions and the presence of occlusions, such as hair or people squinting. Iris tracking can also be utilized to determine the metric distance of the camera to the user. This can improve a variety of use cases, ranging from virtual try-on of properly sized glasses and hats to accessibility features that adopt the font size depending on the viewer's distance. Often, sophisticated specialized hardware is employed to compute the metric distance, limiting the range of devices on which the solution could be applied.