1. A camera, comprising: at least one light sensitive region formed in a substrate; substantially transparent material disposed on the substrate over the at least one light sensitive region; a first substantially opaque mask layer disposed in the substantially transparent material and covering the at least one light sensitive region; a second substantially opaque mask layer disposed in the substantially transparent material over the first substantially opaque mask layer; at least one first opening formed in the first substantially opaque mask layer; and at least one second opening formed in the second substantially opaque mask layer, wherein, the at least one first opening and the at least one second opening are substantially transparent to light, and a light sensitive region of the at least one light sensitive region is configured to sense light transmitted through the at least one first opening and the at least one second opening in accordance with the alignment of the at least one first opening and the at least one second opening.