Vehicular camera
First Claim
Patent Images
1. A vehicular camera for detecting desired imaging objects by shooting surroundings of a vehicle, comprising:
- a lens for forming an image of light coming from the outside on an image pickup device;
the image pickup device for performing photoelectric conversion on the image formed thereon;
an image processing unit for producing a video signal by processing a signal produced by the image pickup device; and
an optical filter for causing a difference between luminance of each of n kinds of objects to be detected and luminance of a background, the optical filter having a spectral transmittance characteristic F(λ
) that satisfies
∫
F1(λ
)F(λ
)dλ
>
∫
Fm(λ
)F(λ
)dλ
∫
F2(λ
)F(λ
)dλ
>
∫
Fm(λ
)F(λ
)dλ
∫
FM(λ
)F(λ
)dλ
>
∫
Fm(λ
)F(λ
)dλ
where λ
is wavelength of light, F1(λ
), F2(λ
), . . . , Fn(λ
) are spectral characteristics of the n kinds of objects to be detected, respectively, and Fm(λ
) is a spectral characteristic of a background.
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Accused Products
Abstract
A vehicular camera for detecting desired imaging objects by shooting the surroundings of a vehicle includes a lens for forming an image of light on an image pickup device, an optical filter capable of selectively transmitting a component of light in a particular wavelength range, the image pickup device for performing photoelectric conversion on the image formed thereon, and an image processing unit for producing a prescribed video signal by processing a signal produced by the image pickup device.
12 Citations
14 Claims
-
1. A vehicular camera for detecting desired imaging objects by shooting surroundings of a vehicle, comprising:
-
a lens for forming an image of light coming from the outside on an image pickup device;
the image pickup device for performing photoelectric conversion on the image formed thereon;
an image processing unit for producing a video signal by processing a signal produced by the image pickup device; and
an optical filter for causing a difference between luminance of each of n kinds of objects to be detected and luminance of a background, the optical filter having a spectral transmittance characteristic F(λ
) that satisfies
∫
F1(λ
)F(λ
)dλ
>
∫
Fm(λ
)F(λ
)dλ
∫
F2(λ
)F(λ
)dλ
>
∫
Fm(λ
)F(λ
)dλ
∫
FM(λ
)F(λ
)dλ
>
∫
Fm(λ
)F(λ
)dλwhere λ
is wavelength of light, F1(λ
), F2(λ
), . . . , Fn(λ
) are spectral characteristics of the n kinds of objects to be detected, respectively, and Fm(λ
) is a spectral characteristic of a background. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A vehicular camera for detecting desired imaging objects by shooting surroundings of a vehicle, comprising:
-
a lens for forming an image of light coming from the outside on an image pickup device;
the image pickup device for performing photoelectric conversion on the image formed thereon;
an image processing unit for producing a video signal by processing a signal produced by the image pickup device; and
an optical filter that transmits a component whose wavelength λ
satisfies
470 nm≦
λ
≦
740 nm,wherein desired objects to be detected include white and yellow lane boundary lines on a road and a background is an asphalt or concrete road surface. - View Dependent Claims (13, 14)
-
Specification
-
- Resources
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Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
-
InventorsFujii, Yoshiyuki
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current348/360
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CPC Class CodesB60R 1/00 Optical viewing arrangement...B60R 2300/30 characterised by the type o...B60R 2300/804 for lane monitoringG02B 5/22 Absorbing filters G02B5/201...
