1. A method of audience monitoring, comprising: determining a mask for an image having a plurality of image pixels, the image pixels including a plurality of mask pixels, a plurality of background pixels, and a plurality of foreground pixels, the mask having the plurality of mask pixels, a background having the plurality of background pixels, and a foreground having the plurality of foreground pixels; removing at least a portion of the plurality of mask pixels and at least a portion of the plurality of background pixels from the image pixels; calibrating at least a portion of the plurality of foreground pixels; determining a sum total of the calibrated foreground pixels; and determining a number of people present in the audience based on the calculated sum total of calibrated foreground pixels.