Source: https://www.researchgate.net/profile/Joao_Tavares2/publication/38025754_Three-dimensional_reconstruction_and_characterization_of_human_external_shapes_from_two-dimensional_images_using_volumetric_methods/links/09e415122569505b68000000/Three-dimensional-reconstruction-and-characterization-of-human-external-shapes-from-two-dimensional-images-using-volumetric-methods.pdf