Patent ID: 8467578

Claim:
An apparatus for extracting scenery depth information, the apparatus comprising: an optical element; and a coding element placed on routes of object lights passing through the optical element, the coding element being configured to modulate point spread functions of the optical element, wherein the object lights carry scenery depth information; wherein codes of the coding element are specified by W ⁡ ( x , y ) = ∑ n , l , m ⁢ A nx ⁢ x 2 ⁢ n + A ny ⁢ y 2 ⁢ n + A lmxy ⁢ x l ⁢ y m , where x and y are coordinate positions of the coding element, n is a positive integer, l+m is an even number, A nx and A ny are the coefficients in terms x 2n and y 2n respectively, and A lmxy is the coefficient in term xy.