Range imaging has been widely used in the fields of computer sciences and industry. To obtain a range image, a device is developed by using a marked line structured light with direct coding the black-and-white stripes. This paper presents a range imaging method which encodes the projective image with marked structured lights and decodes the depth image with geometry of the black-and-white stripes. Experimental results show that, our method quickly and accurately acquires depth data of objects with a single-shot pattern.