Method and system for measuring a relative position and orientation of range cameras using a movement of an object within a scene. The organic transistor array in a plan view is sectioned into sections each forming a single pixel, and each section has a closest packed structure. The base section further includes a seat and a foot plate for supporting a foot of a user at an elevated position above ground level. The apparatus can be further controlled so that an illumination period terminates at or prior to an exposure termination time of the certain row.