MATRIXING APPARATUS

• US 3,558,806 A
• Filed: 04/01/1968
• Issued: 01/26/1971
• Est. Priority Date: 04/01/1968
• Status: Expired due to Term

• Current Assignee: John F. Monahan, Robert A. Dischert
• Original Assignee: John F. Monahan, Robert A. Dischert
• Inventors: Monahan, John F., Dischert, Robert A.
• Application Number:
  US04/717,655
• Time in Patent Office: 1,030 Days
• US Class Current: 348/661
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85

Abstract

Matrixing apparatus for performing masking operations in a color television system wherein the relative amplitudes of color difference signals derived from component color signals are compared to obtain control voltages, and wherein the control voltages so obtained are selectively added to or subtracted from individual component color signals to effectively change the hue and saturation of the original color information.

Claims

1. In a color television system provided with a plurality of simultaneous primary color signal components matrixing apparatus comprising:

means for applying said primary color signal components to said matrixing apparatus;

means for combining a first one of said color signal components with a second one of said color signal components;

means for combining said first color signal component with a third one of said color signal components;

means responsive to the amplitude and polarity of the outputs of each of said first-named and second-named signal combining means for providing a voltage indicative of the amplitude of the one of said first, second and third primary color signal components and of their complementary color signal components which is predominant in a televised scene when the outputs of said first and second-named combining means are of the same predetermined polarity;

means coupled to said last-mentioned means for adjusting at least one of the amplitude and polarity of said indicative voltage and for providing an output voltage suitable for color control;

adder circuit means; and

means for coupling the output of said adjusting means and one of said primary color signal components to said adder circuit means.

2. Matrixing apparatus as defined in claim 1 wherein said first and second-namEd combining means each include means for respectively reversing the polarity of said second and third primary color signal components applied thereto with respect to the polarity of said applied first primary color signal component, to provide first and second color difference signals of nominally differing amplitudes.

3. Matrixing apparatus as defined in claim 1 wherein said adjusting means includes means for providing first, second and third control voltages, wherein said adder circuit means includes first, second and third adder circuits having a common output terminal, and wherein said coupling means couples individual ones of said control voltages to selected adder circuits along with selected primary color signal components, as desired, to establish at least one of the hue and saturation of the televised scene represented by the combined color signal components developed at said common output terminal.

4. In a color television system provided with a plurality of simultaneous red, green and blue primary color signal components, matrixing apparatus comprising:

means for applying said primary color signal components to said matrixing apparatus;

means for combining a first one of said color signal components with a second one of said color signal components for providing a first color difference signal;

means for combining said first color signal component with a third one of said color signal components for providing a second color difference signal, said first and second color difference signals being of nominally different amplitudes and of the form X-Y and X-Z;

means responsive to the amplitude of the outputs of each of said first-named and second-named signal combining means for providing a voltage indicative of the amplitude of the one of said first, second and third primary color signal components which is predominant in a televised scene when the most negative of said X-Y and X-Z signal amplitudes is of positive polarity;

means coupled to said last-mentioned means for adjusting at least one of the amplitude and polarity of said indicative voltage and for providing an output voltage suitable for color control;

adder circuit means; and

means for coupling the output of said adjusting means and one of said primary color signal components to said adder circuit means.

5. Matrixing apparatus as defined in claim 4 wherein said adjusting means includes means for providing a first control voltage in response to said predominant primary color voltage indication, wherein said adder circuit means includes first, second and third adder circuits having a common output terminal, and wherein said coupling means includes means for coupling the less predominant two of said primary color signal components to said first and second adder circuits, respectively, and means for coupling said first control voltage and the predominant one of said red, green and blue primary color signal components to said third adder circuit, to establish the saturation of the televised scene represented by the combined color signal components developed at said common output terminal.

6. Matrixing apparatus as defined in claim 4 wherein said adjusting means includes means for providing first and second control voltages in response to said predominant primary color voltage indication, wherein said adder circuit means includes first, second and third adder circuits having a common output terminal, and wherein said coupling means includes means for coupling the less predominant two of said primary color signal components to said first and second adder circuits, respectively, means for respectively coupling said first and second control voltages to said first and second adder circuits and means for coupling the predominant one of said red, green and blue primary color signal components to said third adder circuit, to establish the hue of the televised scene represented by the combined color signal components developed at said common output terminal.

7. MAtrixing apparatus as defined in claim 5 wherein said adjusting means also includes means for providing second and third control voltages in response to said predominant primary color voltage indication, and wherein said coupling means also includes means for coupling said second and third control voltages to said first and second adder circuits, respectively, to cooperate with the less predominant primary color signal components coupled thereto to additionally establish the hue of the televised scene represented by the combined color signal components developed at said common output terminal.

8. In a color television system provided with a plurality of simultaneous red, green and blue primary color signal components respectively having cyan, magenta and yellow complementary color signal components, matrixing apparatus comprising:

means for applying said primary and complementary color signal components to said matrixing apparatus;

means for combining a first one of said color signal components with a second one of said color signal components for providing a first color difference signal;

means for combining said first color signal component with a third one of said one of said color signal components for providing a second color difference signal, said first and second color difference signals being of nominally different amplitudes and of the form X-Y and X-Z, respectively;

means responsive to the amplitude of the outputs of each of said first-named and second-named signal combining means for providing a voltage indicative of the amplitude of the one of said complementary color signal components which is predominant in a televised scene when the most positive of said X-Y and X-Z signal amplitudes is of negative polarity;

means coupled to said last-mentioned means for adjusting at least one of the amplitude and polarity of said indicative voltage and for providing an output voltage suitable for color control;

adder circuit means; and

means for coupling the output of said adjusting means and one of said primary color signal components to said adder circuit means.

9. Matrixing apparatus as defined in claim 8 wherein said adjusting means includes means for providing a first control voltage in response to said predominant complementary color voltage indication, wherein said adder circuit means includes first, second and third adder circuits having a common output terminal, and wherein said coupling means includes means for coupling the two of said primary color signal components which taken together form the hue of the predominant one of said cyan, magenta and yellow complementary color signal components to said first and second adder circuits, respectively, means for coupling said first control voltage to said first and second adder circuits, and means for coupling the third of said mentioned primary color signal components to said third adder circuit to establish the saturation of the televised scene represented by the combined color signal components developed at said common output terminal.

10. Matrixing apparatus as defined in claim 8 wherein said adjusting signal components includes means for providing first and second control voltages in response to said predominant complementary color voltage indication, wherein said adder circuit means includes first, second and third adder circuits having a common output terminal, and wherein said coupling means includes means for coupling the two of said primary color signal components which taken together form the hue of predominant one of said cyan, magenta and yellow complementary color signal components to said first and second adder circuits, respectively, means for respectively coupling said first and second control voltages to said first and second adder circuits, and means for coupling the third of said-mentioned primary color signal components to said third adder circuit to establish the hue of the televised scene represented by the combined color signal components developEd at said common output terminal.

11. Matrixing apparatus as defined in claim 9 wherein said adjusting means also includes means for providing second and third control voltages in response to said predominant complementary color voltage indication, and wherein said coupling means also includes means for coupling said second and third control voltages to said first and second adder circuits, respectively, to cooperate with the primary color signal components coupled thereto to additionally establish the hue of the televised scene represented by the combined color signal components developed at said common output terminal.

12. In a color television system provided with a plurality of simultaneous red, green and blue primary color signal components, matrixing apparatus comprising:

means for applying said primary color signal components to said matrixing apparatus;

means for combining a first one of said color signal components with a second one of said color signal components for providing a first color difference signal;

means for combining said first color signal component with a third one of said color signal components for providing a second color difference signal, said first and second color difference signals being of nominally different amplitudes and being of the form X-Y and X-Z, respectively;

means responsive to the amplitude of the outputs of each of said first-named and second-named signal combining means for providing a voltage indicative of the amplitude of the one of said primary color signal components which is predominant in a televised scene when the most positive of said X-Y and X-Z signal amplitudes is of negative polarity;

means coupled to said last-mentioned means for adjusting at least one of the amplitude and polarity of said indicative voltage and for providing an output voltage suitable for color control;

adder circuit means; and

means for coupling the output of said adjusting means and one of said primary color signal components to said adder circuit means.

13. In a color television system provided with a plurality of simultaneous red, green and blue primary color signal components respectively having cyan, magenta, and yellow complementary color signal components, matrixing apparatus comprising:

means for applying said color signal components to said matrixing apparatus;

means for combining a first one of said color signal components with a second one of said color signal components for providing a first color difference signal;

means for combining said first color signal component with a third one of said color signal components for providing a second color difference signal, said first and second color difference signals being of nominally differing amplitudes and of the form X-Y and X-Z, respectively;

means responsive to the amplitude of the outputs of each of said first-named and second-named signal combining means for providing a voltage indicating of the amplitude of the one of said complementary color signal components which is predominant in a televised scene when the most negative of said X-Y and X-Z signal amplitudes is of positive polarity;

means coupled to said last mentioned means for adjusting at least one of the amplitude and polarity of said indicative voltage and for providing an output voltage suitable for color control;

adder circuit means; and

means for coupling the output of said adjusting means and one of said primary color signal components to said adder circuit means.