1. An apparatus to count people in an image comprising: a motion detector to compare at least two images to detect motion occurring between the at least two images to develop a difference image; a shape outliner to draw at least one shape based on the difference image; and a blob discriminator to determine if the at least one shape represents a person; wherein the blob discriminator comprises: a center locator to identify a center of the at least one shape; a center comparator to add a symbol representative of the center of the at least one shape to a histogram; and a threshold counter to count symbols in the histogram exceeding a predetermined threshold as persons.