Desktop-based virtual reality involves displaying a 3-dimensional virtual world on a regular desktop display without use of any specialized movement-tracking equipment. Many modern computer games can be used as an example, using various triggers, responsive characters, and other such interactive devices to make the user feel as though they are in a virtual world. A common criticism of this form of immersion is that there is no sense of peripheral vision, limiting the user’s ability to know what is happening around them.
With avatar image-based virtual reality, people can join the virtual environment in the form of real video as well as an avatar. The proposed image VR system can …handle two types of users. One can participate in the 3D distributed virtual environment as form of either a conventional avatar or a real video. Background of the video is effectively eliminated to enhance the sense of reality. A user can select his/her own type of participation based on the system capability. Users with capture board and camera may select a video avatar while others select a conventional computer graphics-based avatar. Avatar image-based VR now provides pretty good interaction environment between human and computer far beyond the conventional desktop computer systems. High-speed networks become available with the advance of network technologies.