EP0171791A2
Expired / Lapsed
EP
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Color video camera
Assignee: Hitachi Ltd
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Filing: 1985-08-13
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Granted: —
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Expires: 2005-08-13
Abstract
Abstract A color video camera using an infrared cut-off filter, a complimentary filter and a solid state image pick-up device is disclosed, the infrared cut-off filter cuts off near infrared light of image above a wavelength \c, which is set in the range of 670nm s λc ≦ 780 nm. A color sampling/generating circuit (4) has a matrix circuit connected to the solid state image pick-up device (3) 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 a blue color difference signal 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.
Inventors
- 👤 Takuya Hitachi-Hachimanyama Apartment 514 Imaide
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 06:03
CPC Classifications
H; H04; H04N; H04N25/00; H04N25/10; H04N25/11; H04N25/13; H04N25/133; H04N23/00; H04N23/80; H04N23/84
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
103 words
A color video camera, characterized by means (3) for picking up an image to provide an image signal, means (4) connected to said picking up means (3) for generating a first luminance signal, a second luminance signal and color channel signals from said image signal, means (5) connected to said generating means (4) for processing said second luminance signal and said color channel signals to provide color difference signals and for passing said first luminance signal, and means (6) connected to said processing means (5) for producing a color video signal in accordance with said first luminance signal and said color difference signals.
Claim 2
Dependent Claim
103 words
A color video camera, characterized by means (3) for picking up an image to provide an image signal, means (4) connected to said picking up means (3) for generating a first luminance signal, a second luminance signal and color channel signals from said image signal, means (5) connected to said generating means (4) for processing said second luminance signal and said color channel signals to provide color difference signals and for passing said first luminance signal, and means (6) connected to said processing means (5) for producing a color video signal in accordance with said first luminance signal and said color difference signals.
Claim 3
Dependent Claim
26 words
The color video camera according to claim 1, characterized in that said second luminance signal has a lower band frequency characteristic than said first luminance signal.
Claim 4
Dependent Claim
29 words
The color video camera according to claim 1 or 2, further characterized by means (2) for cutting off the near infrared light of said image above a wavelength λc.
Claim 5
Dependent Claim
121 words
A color video camera characterized by means (2) for filtering an image, means (3) for picking up said image through said filtering means to provide an image signal, means (4) connected to said picking up means (3) for generating a first luminance signal, a second luminance signal, a red channel signal and a blue channel signal from said image signal, means (5) connected to said generating means (4) 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, and means (6) for producing a color video signal from said first luminance signal, said red color difference signal and said blue color difference signal.
Claim 6
Dependent Claim
121 words
A color video camera characterized by means (2) for filtering an image, means (3) for picking up said image through said filtering means to provide an image signal, means (4) connected to said picking up means (3) for generating a first luminance signal, a second luminance signal, a red channel signal and a blue channel signal from said image signal, means (5) connected to said generating means (4) 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, and means (6) for producing a color video signal from said first luminance signal, said red color difference signal and said blue color difference signal.
Claim 7
Dependent Claim
31 words
The color video camera according to claims 1 and 4, characterized in that said picking up means comprises a solid state image pick-up device having a two-dimensional array of photo-electric elements.
Claim 8
Dependent Claim
33 words
The color video camera according to claim 4 or 5 characterized in that said filtering means (2) comprises means for cutting off the near infrared light of said image above a wavelength λc.
Claim 9
Dependent Claim
25 words
The color video camera according to claim 3 or 6 characterized in that said wavelengthlc is set in the range of 670nm =λc = 780nm.
Claim 10
Dependent Claim
40 words
The color video camera according to claim 5, characterized in that said pick-up means (3) further comprises a color filter attached to said solid state image pick-up device for filtering said image provided to said solid state image pick-up device.
Claim 11
Dependent Claim
18 words
The color video camera according to claim 8, characterized in that said color filter comprises a complimentary filter.
Claim 12
Dependent Claim
57 words
The color video camera according to claim 9, characterized in that said complimentary filter comprises a white filter, a cyan filter, a green filter and a yellow filter, and said solid state image pick-up device provides a white image signal, a cyan image signal, a green image signal and a yellow image signal as said image signals.
Claim 13
Dependent Claim
141 words
The color video camera according to claim 10, characterized in that said color channel signals comprise a red channel signal and a blue channel signal, and said generating means (4) includes a matrix circuit (43) for producing said first luminance signal, said second luminance signal and said color channel signals from said white image signal, said cyan image signal, said green image signal and said yellow image signal, said matrix circuit (43) using first matrix coefficients for producing the portion of said second luminance signal corresponding to said white image signal and said yellow image signal and second matrix coefficients for producing the portions of said second luminance signal corresponding to said cyan image signal and said green image signal, said first matrix coefficients being less than said second matrix coefficients to reduce the red component of said second luminance signal.
Claim 14
Dependent Claim
88 words
The color video camera according to claim 10, characterized in that said generating means (4) includes a matrix circuit (43) for producing said first luminance signal, said second luminance signal and said color channel signals from said white image signal, said cyan image signal, said green image signal and said yellow image signal, said matrix circuit (43) using matrix coefficients for producing said first and second luminance signal, said matrix coefficients for producing said second luminance signal being different from matrix coefficients for producing said first luminance signal.
Claim 15
Dependent Claim
32 words
The color video camera according to claim 6, characterized in that said filtering means (2) further comprises a color filter for filtering the image provided to said solid state image pick-up device.
Claim 16
Dependent Claim
36 words
The color video camera according to claim 13, characterized in that said color filter includes a plurality of color filter elements, one said color filter element for each of said photoelectric elements in said two-dimensional array.
Claim 17
Dependent Claim
59 words
The color video camera according to claim 14, characterized in that each said color filter element comprises: a white filter element, a cyan filter element, a green filter element and a yellow filter element, and said solid state image pick-up device provides a white image signal, a cyan image signal, a green image signal and a yellow image signal.
Claim 18
Dependent Claim
126 words
The color video camera according to claim 15, characterized in that said generating means (4) includes a matrix circuit (43) for producing said first luminance signal, said second luminance signal and said color channel signals from said white image signal, said cyan image signal, said green image signal and said yellow image signal, said matrix circuit (43) using first matrix coefficients for producing the portion of said second luminance signal corresponding to said white image signal and said yellow image signal and second matrix coefficients for producing the portion of said second luminance signal corresponding to said cyan image signal and said green image signal, said first matrix coefficients being less than said second matrix coefficients to reduce the red component of said second luminance signal.
Claim 19
Dependent Claim
66 words
The color video camera according to claim 4 characterized in that said generating (4) means includes a matrix circuit (43) for producing said first luminance signal, said second luminance signal and said color channel signals from said image signal; said matrix circuit using matrix coefficients for producing said second luminance signal, said matrix coefficients having values that reduce the red component of said second luminance signal.
Claim 20
Dependent Claim
70 words
The color video camera according to claim 1 or 4, further characterized by means (81-90) inserted between said processing means (5) and said producing means (6) for extracting said red color difference signal below a predetermined value, and means (83,88,89) inserted between said extracting means and said producing means (6) for adding said extracted signal to said first luminance signal to reduce the red component of said first luminance signal.
Claim 21
Dependent Claim
31 words
The color video camera according to claim 18, characterized in that said extracting means (81-90) comprises a clipping circuit (81,82,84) for clipping said red color difference signal below a colorless level.
Claim 22
Dependent Claim
75 words
The color video camera according to claim 4, characterized in that said generating means (4) includes a matrix circuit (43) for producing said first luminance signal, said second luminance signal and said color channel signals from said image signal, said matrix circuit (43) using matrix coefficients for producing said first and second luminance signal, said matrix coefficients for producing said second luminance signal being different from said matrix coefficients for producing said first luminance signal.
References Cited (Backward Citations)
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