A camera includes an image sensing unit which is arranged to be pivotal with respect to a main body unit and is used to sense an object image, an azimuth sensor which is arranged in the main body unit and is used to detect the azimuth of the facing direction of the main body unit, a pivot angle detector...http://www.google.com/patents/US20030231243?utm_source=gb-gplus-sharePatent US20030231243 - Digital camera and photographing direction acquisition method
