Computer based video/graphics display system
AssigneeVideologic Limited
InventorsAnthony P. Marlton, Dennis A. Fielder, Victor G. Halsted, Trevor R. Stockill
Life of this patent
Estimating the term…
Abstract
A computer based video/graphics display system includes a computer system (22) having a graphics generator (24). A video signal from a video source (28) is fed through an input stage (26) to an asynchronous converter (30). The converter (30) synchronises the video signal to the graphics generator (24). The output from the asynchronous converter (30) and the output from the graphics generator (24) are fed to a fading/mixing matrix (34). The combined signal output from the fading/mixing matrix is fed to a computer display monitor (14). The system allows the mixing or windowing of computer graphics and a video image on a common display.
Claims30
In a system for combining a video image from a video source and a computer graphics image from a computer graphics generator, on a display monitor, an apparatus comprising:
- video signal input means for receiving a video signal from said video source;
- graphics signal input means for receiving a graphics signal from said computer graphics generator;
- asynchronous converter means having a signal input coupled to said video signal input means and a control input coupled to said graphics signal input means, for converting said video signal to a modified video signal synchronised to said graphics signal;
- mixer means coupled to said asynchronous converter and to said graphics input means for producing a combined signal from said modified video signal and said graphics signal;
- and
- means coupled to said mixer means for feeding said combined signal to said display monitor.
In a system for combining a video image from a video source and a computer graphics image from a computer graphics generator, on a display monitor, said system including combining means for producing from two synchronized signals a combined signal for display on said display monitor, an apparatus comprising:
- video signal input means for receiving a video signal from said video source;
- graphics signal input means for receiving a graphics signal from said computer graphics generator and for feeding said graphics signal to said combining means as a first of said two synchronized signals;
- and
- asynchronous converter means for converting said video signal to a modified video signal synchronized to said graphics signal and for feeding said modified video signal to said combining means as a second of said two synchronized signals, said asynchronous converter means comprising a dual port framestore buffer having an input port coupled to said video signal input means for inputting said video signal into said framestore buffer, and an output port for asynchronously outputting said modified video signal in synchronization with said graphics signal.
In a system for combining a video image from a video source and a computer graphics image from a computer graphics generator, on a display monitor, said system including combining means for producing from two synchronized signals a combined signal for display on said display monitor, an apparatus comprising:
- video signal input means for receiving a video signal from said video source;
- graphics signal input means for receiving a graphics signal from said computer graphics generator and for feeding said graphics signal to said combining means as a first of said two synchronized signals;
- asynchronous converter means for converting said video signal to a modified video signal synchronized to said graphics signal and for feeding said modified video signal to said combining means as a second of said two synchronized signals;
- synchronizer timing means having an input coupled to said graphics signal input, and a timing signal output synchronized to said graphics signal and coupled to said asynchronous converter means for controlling said asynchronous converter means to output said modified video signal in synchronization with said graphics signal.
In a system for combining a video image from a video source and a computer graphics image from a computer graphics generator, on a display monitor, an apparatus comprising:
- video signal input means for receiving a video signal from said video source;
- graphics signal input means for receiving a graphics signal from said computer graphics generator;
- asynchronous converter means having a signal input coupled to said video signal input means and a control input coupled to said graphics signal input means for converting said video signal to a modified video signal synchronised to said graphics signal;
- mixer means having a graphics input coupled to said graphics signal input means, a video input coupled to said asynchronous converter means, and an output for coupling to said display monitor, said mixer means combining said graphics signal and said modified video signal, pixel-by-pixel, according to an attribute of said graphics signal, to produce a combined output signal.
A method of combining a video image from a video source and a computer graphics image from a computer graphics generator, on a display monitor, comprising the steps of:
- asynchronously converting said video signal to a modified video signal synchronised to said graphics signal;
- combining said modified video signal with said graphics signal, pixel-by-pixel, according to an attribute of said graphics signal;
- and
- feeding said combined signal to said display monitor.
In a system for combining a video image from a video source and a computer graphics image from a computer graphics generator, on a display monitor, an apparatus comprising:
- video signal input means for receiving a video signal from said video source;
- graphics signal input means for receiving a graphic signal from said computer graphics generator;
- framestore buffer means having a signal input coupled to said video signal inputs for converting said video signal to a modified signal synchronised to said graphic signal;
- mixer means coupled to said framestore buffer means and to said graphics input means for producing a combined signal from said modified video signal and said graphics signal;
- and
- means coupled to said mixer means for feeding said combined signal to said display monitor.
Dependencies are inferred from the claim text.