  The virtuality continuum describes the degrees of positive virtuality under
the umbrella term mixed reality. Besides adding virtual information within a
mixed environment, diminished reality aims at reducing real world information.
Mann defined the term mediated reality (MR), which also considered diminished
reality, but without the possibility to describe different degrees of fusion
between a mixed and a diminished reality. That is why this work defines the new
term blending entropy that captures the relations between a mixed and a
diminished reality. The blending entropy is based on the information density of
the mediated reality and the actual area the user has to comprehend, which is
named perceptual frustum. We describe the blending entropy's twodimensional
dependencies and detail important points in the blending entropy's space.
