Determine object size in 2D image ? Given an photograph of a person I want to determine how tall the person is. I have the following information: - picture 12M pixel - the camera's parameters from the images EXIF (focal length: native and 35mm equivalent, resolution, aperture and shutter-speed) - the dimensions of an object held by the person (at the center of the torso). But I have only four points of one small object 10x6 cm. Is this enough - or do I have to live with the inaccuracy ?
Which is the best and most accurate method to determine how tall the person is ?
Thanks