Compared to Augmented Reality/Mixed Reality, which refers to technologies to superimpose Computer Graphics to real environments to enhance the real world, Diminished Reality (DR) refers to visually diminishing or eliminating obstacles in the real world, or seeing through objects such as walls. The techniques and difficulties to implement DR will vary to adapt to various environments. Hence, we first set one clear goal of DR to completely eliminate existences in the real environment from observed scene. Then, we conducted a survey to show guidelines for researchers to achieve the goal. We systematically arranged existing papers with some concerns for DR implementation.
