  Human ability to visualize an image is usually hindered by optical
scattering. Recent extensive studies have promoted imaging technique through
turbid materials to a reality where color image can be restored behind
scattering media in real time. The big challenge now is to recover a 3D object
in a large field of view with depth resolving ability. Here, we reveal a new
physical relationship between speckles generated from objects at different
planes. With a single given point spread function, 3D imaging through
scattering media is achieved even beyond the depth of field (DOF). Experimental
testing of standard scattering media shows that the original DOF can be
extended up to 5 times and the physical mechanism is depicted. This extended 3D
imaging is expected to have important applications in science, technology,
bio-medical, security and defense.
