High resolution video camera apparatus having two image sensors and signal processing
First Claim
1. A video apparatus for generating a signal representative of a scene, comprising:
- an image capturing means for deriving a luminance signal with bandwidth greater than 4.2 MHz, said luminance being representative of said scene at a first frame rate, said luminance signal having a first resolution;
an image capturing means for deriving at least two color component signals, each having bandwidth greater than 0.7 MHz, said color component signals being representative of said scene at a second frame rate and having a second resolution;
a signal processing apparatus for generating, from said color component signals having said second resolution, at least two converted color component signals having said first resolution, said converted color component signals having said first frame rate;
a signal combining apparatus for combining said luminance signal and said converted color component signals, to provide a combined video signal representative of said scene at said first frame rate and having said first resolution.
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Abstract
A video signal generating apparatus where the video signal is produced using two different image sensors has been described. The optical beam received from the camera lens is split into two beams via a beam splitter. Each beam is applied to the corresponding color and monochrome image sensors. Both imagers are scanned synchronously, and the corresponding output signals are digitized. The monochrome imager is scanned at a lower frame rate and generates a high-resolution luminance signal YH. The second imager has color filters, arranged as vertical stripes. This imager is scanned at a higher frame rate, faster than the first frame rate, and generates a set of two low-resolution color difference signals CR and CB, and one low-resolution luminance signals YL. At frame 1 both image sensors are scanned, at frames 2 and 3 only the color sensor is scanned, at frame 4 both image sensors are scanned, at frames 5 and 6 only the color sensor is scanned, at frame 7 both image sensors are scanned, and so on. The low-resolution color signals CR and CB from frames 1,4,7 etc. are digitally interpolated to have the same resolution as corresponding high-resolution luminance signal YH.Parallel with this, a set of motion signals are generated from the low-resolution luminance YL from all frames The motion signals, the interpolated color difference signals, and the high-resolution luminance YH are mixed into a composite data stream, compressed if necessary, and formatted into a standard 20 bits wide 1.5 Giga bits per second data rate. Additional information such as date, time, camera location, etc. can be added to the data stream if needed.
218 Citations
18 Claims
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1. A video apparatus for generating a signal representative of a scene, comprising:
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an image capturing means for deriving a luminance signal with bandwidth greater than 4.2 MHz, said luminance being representative of said scene at a first frame rate, said luminance signal having a first resolution;
an image capturing means for deriving at least two color component signals, each having bandwidth greater than 0.7 MHz, said color component signals being representative of said scene at a second frame rate and having a second resolution;
a signal processing apparatus for generating, from said color component signals having said second resolution, at least two converted color component signals having said first resolution, said converted color component signals having said first frame rate;
a signal combining apparatus for combining said luminance signal and said converted color component signals, to provide a combined video signal representative of said scene at said first frame rate and having said first resolution. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A video camera for generating a signal representative of a scene, comprising:
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an image capturing means for deriving a high resolution luminance signal with bandwidth greater than 4.2 MHz, said high resolution luminance being representative of said scene at a first frame rate and having a first resolution;
an image capturing means for deriving at least two color component signals and one low resolution luminance signal, each having bandwidth greater than 0.7 MHz, said color component signals and said luminance signal being representative of said scene at second frame rate higher than said first frame rate, and having a second resolution;
a signal processing apparatus for generating from said color component signals having said second resolution and said second frame rate, at least two converted color component signals having said first resolution and said first frame rate;
a motion detection apparatus for generating from said low resolution luminance signal at least one motion signal representing the difference between two consecutive frames captured at said second frame rate;
a signal combining apparatus for combining said luminance signal, said converted color component signals and said motion signals to provide a combined video signal representative of said scene, said combined video signal having said first resolution. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for generating a video signal representative of a scene, comprising the steps of:
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deriving a luminance signal representative of said scene at a first frame rate, said luminance signal having a first resolution;
deriving at least two color component signals representative of said scene at a second frame rate, said color component signals having a second resolution;
generating, from said color component signals having said second resolution, a converted color component signal having said first resolution, said converted color component signal having said second frame rate;
combining said luminance signal, and said converted color component signals to provide a video signal representative of said scene having said first resolution. - View Dependent Claims (15, 16, 17, 18)
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Specification