The method comprising: acquiring, by a two-dimensional camera (7), in a scene, a two dimensional image of at least one object (200); identifying the object (200) within the acquired two dimensional image; calculating, by a first means, the size of a pixel of the object (200) in the acquired and segmented two dimensional image taking into account the distance between the object (200) and the two-dimensional camera (7); and calculating, by a second means, several parameters including at least the size, dimensions, body part dimensions, body features, weight and/or volume of the object (200) by using said calculated size of the pixel and an a priori model of the object (200), wherein said a priori model includes information linking different parts, contours or shapes representative of several objects (200), previously acquired with a two-dimensional camera, with several parameters said several objects (200).