A review on illumination techniques in augmented reality

Augmented reality is a widespread concept having application ranging from medicine to entertainment and education. AR faces many challenges like camera tracking, occlusion handling and inconsistent illumination. Real time illumination of virtual objects in dynamic environment is still a challenging task. Various methods have been proposed for real time rendering of virtual objects in real environment. The illumination techniques range over a number of different methods producing results of varied accuracy. In this paper we will discuss about the various illumination methods in augmented reality, the shortcomings and advantages of different technologies and the classification of different methods. The paper discusses about the problem the current techniques are facing and various scope of improvement in future. The classification suggests the applicability of different techniques in different scenarios and also best utilization of data available with better techniques.