Television system having aperture correction

Abstract

In a color television camera system of the type having camera tubes for the production of red, green and blue color signals, contour signals derived from only one of the color signals are added to all of the color signals.

What is claimed is: 
     
       1. A color television system comprising means for producing potential images corresponding to each of three color components of an optical image and converting said potential images into color component signals, means to derive a delayed signal from one of said color component signals by comparing the color component signal with itself at substantially adjacent points of the potential image to thereby obtain a contour signal associated with said color component signal, and means for adding said delayed signal to all of said color component signals to sharpen transitions therein. 
     
     
       2. A color television system as claimed in claim 1 wherein said three color signals comprise red, blue, and green signals respectively and the delayed signal is derived from the green color signal. 
     
     
       3. A color television system as claimed in claim 1 wherein an output signal comprises separate color signals and the delayed signal is added to the individual color signals. 
     
     
       4. A color television system as claimed in claim 1 wherein said adding means adds said color signals to form an output signal and the delayed signal is added to the output signal comprising the sum of the color signals. 
     
     
       5. A color television system as claimed in claim 1 wherein said means for deriving a delayed signal comprises means for deriving both a horizontal and a vertical aperture correction signal. 
     
     
       6. A device as claimed in claim 5 wherein said delay means further comprises means for obviating said delay including means for shifting the scan of the signal source from which the delay signal is derived with respect to the scan of the remaining signal sources. .Iadd. 7. A color television system comprising means for producing potential images corresponding to each of three color components of an optical image and converting said potential images into color component signals, means to derive delayed horizontal and vertical signals from only one of said color component signals by comparing said one color component signal with itself at substantially adjacent points of the potential image to thereby obtain a contour signal associated with only said one component signal, and means for adding said contour signal to an output signal which included all of said color component signals to sharpen image transitions therein. 
     
     
        .Iaddend..Iadd. 8.  A color television system as claimed in claim 7 wherein said three color signals comprise red, blue and green signals respectively, and the contour signal is derived from the green color signal only. .Iaddend..Iadd. 9. A color television system as claimed in claim 7 wherein said output signal comprises separate color signals and the contour signal is added to each of the individual color signals. .Iaddend. .Iadd. 10. A color television system as claimed in claim 7 wherein said output signal is a composite signal formed by adding said color signals in predetermined portions and said contour signal is added to said composite signal. .Iaddend..Iadd. 11. A color television system as claimed in claim 7 wherein said delay means further comprises means for obviating said delay including means for shifting the scan of the signal source from which the delay signal is derived with respect to the scan of remaining signal sources. .Iaddend.