Position-dependent interactivity system for image display
Patent 4857902 Issued on August 15, 1989. Estimated Expiration Date: 
May 14, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 14, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3541521 Dynamically variable keyboard terminal Dialog between TV movies and human viewers Input device featuring both trackball and mouse capability Patent #: 4562347 InventorsAssigneeApplicationNo. 07/050196 filed on 05/14/1987US Classes:345/167, Trackball345/545, Frame buffer345/568, Address translation (e.g., between virtual and physical addresses)348/116, Direction finding or location determination715/856CursorExaminersPrimary: Moore, David K.Assistant: Oberley, Alvin E. Attorney, Agent or FirmInternational ClassG06F 3/033 (20060101)AbstractAn interactive video display system with tight coupling between user-input and the images displayed to provide a feeling of real control by the user. A library of frames of video data is stored in randomly accessible data locations, such as an optical video disc. The video data in each frame in the library is assigned a virtual position in a pre-defined data space, such that the visual image in each frame is related to visual images in other frames by virtual position in the data space. User input is provided through track ball or mouse generating displacement signals. The input signal is translated to an updated virtual position in the data space relative to a previous virtual position and the next frame having the updated virtual position is displayed next.Other References
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