Abstract: A vision-based parameter adjustment method (40) and system (10) can include a presentation device (14), a camera (18) and a processor 16). The system can visually recognize (41) a user or a set of users using a vision-based recognition system, track (42) at least one user preference setting for the user or the set of users, and automatically set (44) the at least one user preference setting upon visually recognizing the set. The method can determine (43) a time of day and occupancy within a location. The method can modify (45) a pre-set setting for the user or the set of users as an evolving preference. The preset settings can also be modified (46) based on factors selected among time of day, day of the week, channel selection, and environment. The method can also modify (47) a preset setting the set of users based on a trend.