ITPEC IP October 2021 Question 25

Computer-simulated objects and spaces perceived like the real world — virtual reality immerses the user in a world made by computer graphics and other techniques.

VR builds a three-dimensional space with computer graphics and presents it through a head-mounted display, stereo sound and sometimes touch feedback. Sensors track the user's head and hand movements, so the view changes as if the user were really inside the space. It is used in games, flight and surgical training, and walk-throughs of buildings not yet built.

Answer (b)

Why not others:

• •(a) — describes progressive display of an image (interlaced or progressive JPEG), which shows a coarse version first and sharpens it
• •(c) — describes computer simulation used in design; it replaces a physical test with calculation but does not make the user feel present in the space
• •(d) — describes image compositing (chroma key), which combines separately shot pictures into one

Key rule: VR replaces the surroundings with a computer-made world the user feels present in; AR instead overlays computer information on the real view.

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