1. A method for segmenting a breast from surrounding tissue in a thermographic image for breast cancer screening, the method comprising: receiving a thermal image of a breast area of a person, pixels in the thermal image with a highest temperature value being displayed in a first color and pixels with a lowest temperature value being displayed in a second color, pixels with temperature values between the lowest and highest temperature values being displayed in gradations of color between the first and second colors; analyzing the thermal image to identify a plurality of points P N , where N≧5, in the thermal image surrounding the breast area; and connecting the points together to obtain a N-sided polygon which segments the breast from surrounding tissue in the thermal image.