1. A method, comprising the steps of: causing a sensor to generate sensor image information which includes information representative of subject matter of interest and information representative of other subject matter; maintaining virtual image information, including the step of separately maintaining first virtual information representative of the subject matter of interest and second virtual information representative of the other subject matter; updating the virtual image information using the sensor image information in a manner which improves the quality of the representation of the subject matter of interest in the first virtual information and the quality of the other subject matter in the second virtual information; and preparing combined image information by combining information from the sensor image information with information from the first virtual information, the combined image information including an image of the subject matter of interest.