Types
HMDs differ in whether they can display just a computer generated image (CGI), show live images from the real world or a combination of both.
- Most HMDs display only a computer-generated image, sometimes referred to as a virtual image
- Some HMDs allow a CGI to be superimposed on a real-world view. This is sometimes referred to as augmented reality or mixed reality. Combining real-world view with CGI can be done by projecting the CGI through a partially reflective mirror and viewing the real world directly. This method is often called Optical See-Through. Combining real-world view with CGI can also be done electronically by accepting video from a camera and mixing it electronically with CGI. This method is often called Video See-Through.
Read more about this topic: Head-mounted Display
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