Composite video signal combining system
Patent 4292649 Issued on September 29, 1981. Estimated Expiration Date: 
February 14, 2000. 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.
February 14, 2000. 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 References3764732 InventorAssigneeApplicationNo. 06/121779 filed on 02/14/1980US Classes:348/587Including hue detection (e.g., chroma key)ExaminersPrimary: Martin, John C.Attorney, Agent or FirmInternational ClassH04N 9/75 (20060101)Foreign Application Priority Data1979-02-12 FRAbstractThe system combines first and second composite video signals into a resulting composite video signal. The first composite video signal represents a foreground scene having a first trichromatic moving picture region which envelopes a second trichromatic backing region through a trichromatic transition region. The second composite video signal represents a background scene. A gain controlling circuit produces from first component video signals first and second analog signals (1-), () which control in proportion the amplifications of the first and second composite video signals to obtain second output composite video signals. The first analog signal has first and second levels when the first component video signals are representative of the first and second picture regions and has intermediate levels lying between the first and second levels when the first component video signals are representative of the transition region. A video mixer mixes the first and second output composite video signals into the resulting composite video signal. | |
