Main research topics related to diminished reality (DR) are to mitigate the geometric and photometric gaps between the real of undesirable objects and synthesized background images to diminish the objects feasibly. However, most of DR literatures describe a monocular video see-through (VST) type system while very a few showed a binocular stereoscopic DR system. That is, it can be said that the problem concerning binocular stereopsis in DR is virtually unconfirmed. This paper shows the first evidence of two types of binocular mismatching effects which can appear in observation-based DR using VST head-mounted display. Our experiments demonstrated the following issues: (i) Parallax jitters in image-based rendering-based hidden view recovery due to insufficient number of observation viewpoints and (ii) Unnatural depth perception at boundaries between real and synthesized regions due to their photometric gaps.
