A hand-held device comprising a housing (10) shaped and dimensioned to allow the device to be hand held, a display (12) secured to the housing for displaying moving pictures on a frame-by-frame basis, and a camera (16, 18) having an optical axis (O) extending generally away from the display to image...http://www.google.es/patents/US6781623?utm_source=gb-gplus-sharePatente US6781623 - Vertical compensation in a moving camera
