B. Context When we are dealing with the subject of Context Aware Augmented Reality, the term “Context” determines the content that gets augmented to reality. Figure 2 depicts our understanding of the concept of context. As shown in this figure, we have the mobile/handheld device that has sensors to get the context information. Determining the context can be a multi-level process. The first level context information comes from various sensors attached directly/indirectly to the mobile device. Environmental measurements include temperature, humidity, light intensity, sound energy, etc. Location information comes from GPS interface, but can also come from other triangulation methods with distance measurement techniques. In addition there are useful devices like the compass and accelerometer that give the direction, motion and orientation of the person. Time is another context input useful in some applications