1. A method, performed in a video analytic device, for detecting people within frames of video based upon multiple colors within their clothing, the method comprising: receiving a current frame of video; determining that a first color region within the current frame matches a first color of interest for a clothing uniform, wherein the determining is based on a first set of color representation constraints; determining that a second color region within the current frame matches a second color of interest for the clothing uniform, wherein the determining is based on a second set of color representation constraints, wherein the first and second colors of interest are different; and applying a set of geometric constraints to the first and second color regions to determine a count of people within the current frame wearing the clothing uniform, wherein the first set of color representation constraints comprises a first color label and a first color classifier that represent the first color of interest, and the second set of color representation constraints comprises a second color label and a second color classifier that represent the second color of interest, wherein determining that the first color region within the current frame matches the first color of interest and determining that the second color region within the current frame matches the second color of interest comprise: determining, within a first resolution image of the current frame, a first set of pixels that match the first color label and a second set of pixels that match the second color label; applying, within a second resolution image of the current frame, the first color classifier to the first set of pixels to classify the first set of pixels to determine the first color region, wherein the second resolution is higher than the first resolution; and applying, within the second resolution image of the current frame, the second color classifier to the second set of pixels to classify the second set of pixels to determine the second color region.