1. An audience identification method comprising: detecting, with a processor, a trigger signal output from a media device meter; in response to determining, with the processor, that an image captured by an image sensor does not correspond to any one of a plurality of recognized audiences, passing the trigger signal to an input of a people meter to cause the people meter to output a prompt for entry of audience identification information; and in response to determining, with the processor, that the image corresponds to a first one of the plurality of recognized audiences, blocking the trigger signal from being passed to the input of the people meter to prevent the people meter from outputting the prompt.