Yes, Most cameras there are also some type of sensitivity or gain control for this function. If there are three groups of people the group that has the higher population or count will get the focus of the camera. There are at least 2 function/settings that will affect this. ---The gain or sensitivity adjustment for the heat map. (Dependent upon camera type, model and features). ---Facial Recognition function related to specifically looking (Comparison) for a specific face or faces. Simple answer is the heat map is a function that will concentrate on the larger group of detectible faces.