| 摘要 |
<p>A control arrangement eg for a computer cursor comprises an imaging device viewing an object space, a light source illuminating the space, a retroreflector capable of being moved within the space to reflect light from the source to enable a retroreflected image to be detected by the imaging device, and means to effect a control operation in dependence on the position and/or colour of the retroreflected image. One or more differently coloured retroreflectors (9,1) may be attached to the front and/or back of one or more fingers either with adhesive or using a ring or band, or may be attached to a hand held card or stick. A two way mirror may be used to present to a person standing in the object space with a combined an image of that person (3) and a computer screen (7) showing a program with interactive buttons (10, 11, 12).</p> |
