Pixel-wise video registration system

Claim 2

A pixel-wise video registration system comprising: a first video source for providing a first image including a plurality of pixels; a second video source for providing a second image including a plurality of pixels, said first image and said second image being asynchronously produced; a video multiplexer for overlaying said first image onto said second image in synchronous registration, one pixel at a time, to provide an overlayed video image, said video multiplexer coupled to said first video source and to said second video source; said video multiplexer including a prioritizer for selecting pixel-wise, said first image in first priority from said first video source and in second priority said second image from said second video source when a pixel of said first image is not present, said prioritizer operating within substantially less than a pixel time to switch between said first image and said second image, said prioritizer coupled to said first and said second video sources; and a monitor for visually displaying said overlayed video image, said monitor coupled to said video multiplexer and to said prioritizer.

Claim 3

A pixel-wise video registration system as claimed in claim 1, wherein the coupling of said video multiplexer to said second video source includes a plurality of signals including: a horizontal sync signal; a vertical sync signal; and a pixel clock signal for synchronizing said second image to said first image pixel by pixel.

Claim 4

A pixel-wise video registration system as claimed in claim 2, wherein said video multiplexer includes a first sync extractor for extracting said vertical sync signal, said horizontal sync signal, and a first composite vertical and horizontal sync signal from a green video signal of said first video source, said first sync extractor coupled to said first video source.

Claim 5

A pixel-wise video registration system as claimed in claim 3, wherein said video multiplexer further includes an adjuster for adjusting said vertical sync signal to provide an adjusted vertical sync signal, said adjuster coupled to said first sync extractor.

Claim 6

A pixel-wise video registration system as claimed in claim 4, wherein said video multiplexer further includes a first divider for dividing said adjusted vertical sync signal by a first predefined value, said first divider coupled between said adjuster and said second video source, said divider for transmitting said divided vertical sync signal to said second video source.

Claim 7

A pixel-wise video registration system as claimed in claim 5, wherein said video multiplexer further includes a second sync extractor for extracting a second composite vertical and horizontal sync signal from a green video signal of said second video source.

Claim 8

A pixel-wise video registration system as claimed in claim 6, wherein said video multiplexer further includes a delay for producing a delayed version of said second composite vertical and horizontal sync signal of said second sync extractor, said delay coupled to said second sync extractor, said second sync extractor coupled to said second video source.

Claim 9

A pixel-wise video registration system as claimed in claim 7, wherein said video multiplexer further includes a frame synchronizer for synchronizing said composite vertical and horizontal sync signal of said first video source with said composite vertical and horizontal sync signal of said second video source to produce said pixel clock signal, said frame synchronizer coupled to said first sync extractor and to said delay.

Claim 10

A pixel-wise video registration system as claimed in claim 8, wherein said video multiplexer further includes a second divider for dividing an output of said frame synchronizer to produce said horizontal sync signal, said second divider coupled to said frame synchronizer, to said first divider and to said second video source.

Claim 11

A pixel-wise video registration system as claimed in claim 1, wherein said video multiplexer further includes a video delay circuit for delaying red, green, and blue signals of said second video source comprising said second image, said video delay coupled to said second video source.

Claim 12

A pixel-wise video registration system as claimed in claim 10, wherein said video multiplexer further includes a threshold for determining whether information is present on at least one of a red, green, and blue lead of said first video source comprising said first image, said threshold for comparing each of said red, green, and blue signals to a predetermined reference signal, said threshold coupled to said first video source.

Claim 13

A pixel-wise video registration system as claimed in claim 11, wherein said video multiplexer further includes a DC offset for insuring that said red, green, and blue signals of said first video source and second video source have approximately a same DC offset, said DC offset coupled to said first video source.

Claim 14

A pixel-wise video registration system as claimed in claim 12, wherein said video multiplexer further includes a delay for delaying said red, green, and blue signals of said first video source, said delay coupled to said DC offset.

Claim 15

A pixel-wise video registration system as claimed in claim 13, wherein said prioritizer for selecting pixel-wise, said red, green, and blue signals in first priority from said first video source and in second priority from said second video source when a pixel of said first video source is not present, said prioritizer coupled to said threshold, to said delay, and to said video delay circuit.

Claim 16

A pixel-wise video registration system as claimed in claim 14, wherein said prioritizer includes a plurality of high speed switches for selecting between said red, green, and blue signals of said first video source and said red, green, and blue signals of said second video source on a pixel by pixel basis with priority to said first video source, said high speed switches coupled to said first video source and to said second video source.

Claim 17

A pixel-wise video registration system as claimed in claim 8, wherein said frame synchronizer includes: a phase/frequency detector for generating a voltage proportional to a difference in said composite vertical and horizontal sync signal of said first sync extractor and said composite vertical and horizontal sync signal of said second sync extractor, said phase/frequency detector coupled to said delay and to said first sync extractor; a voltage controlled adjustable oscillator for generating said pixel clock signal, said voltage controlled adjustable oscillator coupled to said second video source; and a loop filter and gain stage for adjusting a frequency of said voltage controlled adjustable oscillator to be constant, said loop filter and gain stage coupled to said phase/frequency detector and to said voltage controlled adjustable oscillator.

Claim 18

A pixel-wise video registration system as claimed in claim 15, wherein said threshold includes: a plurality of comparators for comparing said red, green, and blue signals of said first video source to a predetermined level to produce a plurality of outputs, said plurality of comparators coupled to said first video source; a summer for adding said plurality of outputs of said plurality of comparators to produce a first video output indicating whether any of the red, green, or blue signals of said first video source is present, said summer coupled to said first plurality of comparators; and a plurality of switch drivers for operating said plurality of high speed switches in response to said first video output of said summer, said plurality of switch drivers coupled to said summer.

Claim 19

A pixel-wise video registration system comprising: a first video source for providing a first image including a plurality of pixels; a second video source for providing a second image including a plurality of pixels, said first image and said second image being asynchronously produced; a video multiplexer for overlaying said first image onto said second image in synchronous registration, one pixel at a time, to provide an overlayed video image, said video multiplexer coupled to said first video source and to said second video source; a monitor for visually displaying said overlayed video image, said monitor coupled to said video multiplexer; a frame synchronizer for synchronizing a composite vertical and horizontal sync signal of said first video source with a composite vertical and horizontal sync signal of said second video source to produce a pixel clock signal for synchronizing said first image with said second image, said frame synchronizer coupled to said first video source and to said second video source; and a prioritizer for selecting pixel-wise said first image in first priority from said first video source and said second image in second priority from said second video source when a pixel of said first video source is not present, said prioritizer operating within substantially less than a pixel time to switch between said first image and said second image, said prioritizer coupled to said monitor, to said first video source and to said second video source.

Claim 20

A pixel-wise video registration system comprising: a first video source for providing a first image including a plurality of pixels; a second video source for providing a second image including a plurality of pixels, said first image and said second image being asynchronously produced; a video multiplexer for overlaying said first image onto said second image in synchronous registration, one pixel at a time, to provide an overlayed video image, said video multiplexer coupled to said first video source and to said second video source; a monitor for visually displaying said overlayed video image, said monitor coupled to said video multiplexer; a frame synchronizer for synchronizing a composite vertical and horizontal sync signal of said first video source with a composite vertical and horizontal sync signal of said second video source to produce a pixel clock signal for synchronizing said first image with said second image, said frame synchronizer coupled to said first video source and to said second video source; and a prioritizer for selecting pixel-wise said first image in first priority from said first video source and said second image in second priority from said second video source when a pixel of said first video source is not present, said prioritizer operating within substantially less than a pixel time to switch between said first image and said second image, said prioritizer coupled to said monitor, to said first video source and to said second video source.