Enhanced sensitivity color video camera with reduced red component in second luminance signal
First Claim
1. A color video camera, comprising:
- means for picking up an image to provide an image signal, to which a color filter having a plurality of separate color filter elements is attached,means, connected to said picking up means, for generating a first luminance signal, a second luminance signal and color channel signals from said image signal, said generating means including a matrix circuit for producing said first luminance signal, said second luminance signal and said color channel signals from said image signal, said matrix circuit using first matrix coefficients for producing the portion of said second luminance signal related to a red component and second matrix coefficients for producing the portion of said second luminance signal related to another color component, said first matrix coefficients being less than said second matrix coefficients to reduce the red component of said second luminance signal,means, connected to said generating means, for processing said second luminance signal and said color channel signals to provide color difference signals, andmeans, connected to said processing means, for producing a color video signal in accordance with said first luminance signal and said color difference signals.
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Abstract
A color video camera uses an infrared cut-off filter, a complementary filter and a solid state image pick-up device. The infrared cut-off filter cuts off near infrared light of image above a wavelength λc, which is set in the range of 670 nm≦λc≦780 nm. A color sampling/generating circuit has a matrix circuit connected to the solid state image pick-up device for providing a first luminance signal, a second luminance signal, a red channel signal and a blue channel signal. The second luminance signal is used for producing a red color difference signal and a blue color difference signal by using the red channel signal and the blue channel signal in a processing circuit. In the matrix circuit, matrix coefficients for producing the second luminance signal are set to reduce the red component of the second luminance signal. Further, the red color difference signal below a predetermined value is extracted and added to the first luminance signal to reduce the red component of the first luminance signal.
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Citations
22 Claims
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1. A color video camera, comprising:
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means for picking up an image to provide an image signal, to which a color filter having a plurality of separate color filter elements is attached, means, connected to said picking up means, for generating a first luminance signal, a second luminance signal and color channel signals from said image signal, said generating means including a matrix circuit for producing said first luminance signal, said second luminance signal and said color channel signals from said image signal, said matrix circuit using first matrix coefficients for producing the portion of said second luminance signal related to a red component and second matrix coefficients for producing the portion of said second luminance signal related to another color component, said first matrix coefficients being less than said second matrix coefficients to reduce the red component of said second luminance signal, means, connected to said generating means, for processing said second luminance signal and said color channel signals to provide color difference signals, and means, connected to said processing means, for producing a color video signal in accordance with said first luminance signal and said color difference signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A color video camera comprising:
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means for filtering an image, means for picking up said image through said filtering means to provide a plurality of image signals, means, connected to said picking up means, for generating a first luminance signal, a second luminance signal, a red channel signal and a blue channel signal from said image signals, means, connected to said generating means, for processing said second luminance signal, said red channel signal and said blue channel signal to provide a red color difference signal and a blue color difference signal, means for producing a color video signal from said first luminance signal, said red color difference signal and said blue color difference signal, and wherein; said generating means includes a matrix circuit for producing said first luminance signal, said second luminance signal, said red channel signal and said blue channel signal, said matrix circuit uses matrix coefficients to produce said second luminance signal, said matrix coefficients have values that reduce a red component of said second luminance signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification