Abstract: The present invention relates to a system for measuring media audience, especially for measuring contents broadcast by radio and TV broadcasting stations via land, cable, satellite and otherwise, which comprises at least one local audience measurement device (3) operatively associated to at least one media-content reproducing device (2) and to at least one research and data processing central (4), where the local audience measurement device (3) has means for carrying out local compaction of the program reproduced by the equipment (2) from at least one piece of information sent by the central (4) on the program.

Abstract: The present invention relates to an audience measurement apparatus (100) associable to a TV set (200) provided with a screen (4) that displays at least one piece of OSD (on screen display) information referring to the tuned channel, characterized by comprising at least one camera (1) configured to record at least one image (8) of at least a part of the areas of the screen (4) of the TV set (200), where the piece of OSD information is displayed and means to process the image (8) and detect the tuned channel. Besides the audience measurement apparatus (100), this specification also disclosed a process and system for audience measurement.