Video signal blending apparatus
AssigneeRCA Licensing Corporation
InventorFelix Aschwanden
Life of this patent
Estimating the term…
Abstract
A first video signal component and a second video signal component represent constituent portions of an image to be displayed. An analog signal blending network blends these components together along a boundary region several pixels wide to reconstitute a video signal representing the image to be displayed. The blending network includes first and second active analog devices which exhibit mutually opposite gain over the boundary region to response to a common gain control signal, to produce a virtually invisible seam along the boundary region.
Claims10
Video signal processing apparatus comprising:
- a first gain controllable analog device having a gain control input, and a signal input for receiving a first video signal component;
- a second gain controllable analog device having a gain control input, and a signal input for receiving a second video signal component, said first and second video signal components representing spatially distinct constituent parts of an image to be displayed and sharing a common boundary region containing plural picture elements (pixels);
- means for coupling a gain control signal in common to gain control inputs of said first and second devices for controlling the signal gains of said devices in mutually opposite directions over said boundary region;
- and
- means for combining output signals from said first and second devices.
In a system for processing a widescreen television-type video signal containing a side panel image information component and a main panel image information component, said side panel component and said main panel component sharing a common boundary region containing plural picture elements;
- apparatus comprising:
- a first gain controllable analog device having a gain input, and a signal input for receiving said side panel component;
- a second gain controllable analog device having a gain control input, and a signal input for receiving said main panel component;
- means for coupling a gain control signal in common to gain control inputs of said first and second devices for controlling the signal gains of said devices in mutually opposite directions over said boundary region;
- and
- means for combining output signals from said first and second devices.
Dependencies are inferred from the claim text.